clock_adjtime: use small lock to protect g_adjtime_ppb g_adjtime_wdog

reason: We would like to replace the critical section with a small lock. Signed-off-by: hujun5 <hujun5@xiaomi.com>
clock_timekeeping: remove enter_critical_section in sched/clock/clock_timekeeping.c
2025-01-12 22:07:15 +08:00 · 2025-01-12 16:51:40 +08:00 · 2025-01-12 16:48:35 +08:00 · 2025-01-12 16:47:54 +08:00 · 2025-01-12 16:17:52 +08:00 · 2025-01-12 11:15:42 +08:00
1169 changed files with 29820 additions and 6704 deletions
--- a/.github/workflows/arch.yml
+++ b/.github/workflows/arch.yml
@ -173,21 +173,14 @@ jobs:

          # If Not a Simple PR: Build all targets
          if [[ "$quit" == "1" ]]; then
-            # If PR was Created or Modified: Exclude some boards
+            # If PR was Created or Modified: Include all boards
            pr=${{github.event.pull_request.number}}
            if [[ "$pr" != "" ]]; then
-              echo "Excluding arm-0[1249], arm-1[124-9], risc-v-04..06, sim-03, xtensa-02"
+              echo "Include all boards"
              boards=$(
                echo '${{ inputs.boards }}' |
                jq --compact-output \
-                'map(
-                  select(
-                    test("arm-0[1249]") == false and test("arm-1[124-9]") == false and
-                    test("risc-v-0[4-9]") == false and
-                    test("sim-0[3-9]") == false and
-                    test("xtensa-0[2-9]") == false
-                  )
-                )'
+                '.'
              )
            fi
            echo "selected_builds=$boards" | tee -a $GITHUB_OUTPUT
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -87,7 +87,7 @@ find_program(KCONFIGLIB olddefconfig)
 if(NOT KCONFIGLIB)
  message(
    FATAL_ERROR "Kconfig environment depends on kconfiglib, Please install:
-  $ sudo apt install python3-kconfiglib")
+  $ sudo pip3 install kconfiglib")
 endif()

 # BOARD CONFIG can be set to directory path, or <board-name>[/:]<config-name>
@ -727,6 +727,7 @@ else()
      OUTPUT nuttx.rel
      COMMAND
        ${CMAKE_C_COMPILER} ARGS -r $<$<BOOL:${CONFIG_SIM_M32}>:-m32>
+        $<$<BOOL:${CONFIG_HOST_LINUX}>:-Wl,-z,noexecstack>
        $<TARGET_OBJECTS:sim_head> $<$<NOT:$<BOOL:${APPLE}>>:-Wl,--start-group>
        ${nuttx_libs_paths} $<$<NOT:$<BOOL:${APPLE}>>:-Wl,--end-group> -o
        nuttx.rel
--- a/Documentation/ReleaseNotes/NuttX-12.7.0
+++ b/Documentation/ReleaseNotes/NuttX-12.7.0
@ -0,0 +1,771 @@
+NuttX-12.7.0
+------------
+
+What's New In This Release
+Core OS
+Sched
+* [#13395](https://github.com/apache/nuttx/pull/13395) Critmon optimize, make possible open cpuload based on critmon and disable critical section & sched_lock to save cost.
+* [#12691](https://github.com/apache/nuttx/pull/12691) sched.h: add SCHED_BATCH and SCHED_IDLE definition
+* [#12584](https://github.com/apache/nuttx/pull/12584) sched.h: CPU_XXX macros can also be used without CONFIG_SMP
+* [#12703](https://github.com/apache/nuttx/pull/12703) sched.h: Update doc link for tcbinfo_s
+* [#13274](https://github.com/apache/nuttx/pull/13274) sched: add DEBUGASSERT to assure that affinity not zero
+* [#13341](https://github.com/apache/nuttx/pull/13341) sched: adjust the scheduling strategy
+* [#13105](https://github.com/apache/nuttx/pull/13105) sched: change pthread_mutex implementation from sem to mutex
+* [#12742](https://github.com/apache/nuttx/pull/12742) sched: Improve Kconfig help of INIT_ENTRYPOINT
+* [#13525](https://github.com/apache/nuttx/pull/13525) sched: move DUMP_ON_EXIT to sched
+* [#13211](https://github.com/apache/nuttx/pull/13211) sched: replace up_cpu_index with this_cpu
+* [#13271](https://github.com/apache/nuttx/pull/13271) sched: use this_task replace nxsched_self
+* [#13263](https://github.com/apache/nuttx/pull/13263) sched/event: clear pending events before enable the scheduler
+* [#13329](https://github.com/apache/nuttx/pull/13329) sched/group/setuptask_file: duplicate idle task fd for kernel thread
+* [#13083](https://github.com/apache/nuttx/pull/13083) sched/irq: correct critical section to spin lock
+* [#12802](https://github.com/apache/nuttx/pull/12802) sched/nxevent: add support of kernel event group
+* [#13264](https://github.com/apache/nuttx/pull/13264) sched/policy: move g_policy from data to rodata
+* [#13017](https://github.com/apache/nuttx/pull/13017) sched/sched: simplify the implementation of the function nxsched_readytorun_setpriority
+* [#13134](https://github.com/apache/nuttx/pull/13134) sched/signal: fix pthread_kill use after free
+* [#13530](https://github.com/apache/nuttx/pull/13530) sched/signal: Simplified Implementation for SIGEV_THREAD_TID
+* [#12283](https://github.com/apache/nuttx/pull/12283) sched/signal: There is no need to use sched_[un]lock
+* [#12553](https://github.com/apache/nuttx/pull/12553) sched/tcb: amend pull/12320
+MM
+* [#12550](https://github.com/apache/nuttx/pull/12550) mm: add mm_initialize_pool, make pool more flexible
+* [#12556](https://github.com/apache/nuttx/pull/12556) mm: mm_threshold perfer from init
+* [#12501](https://github.com/apache/nuttx/pull/12501) mm/iob: Simplify IOB alloc/free logic
+* [#12923](https://github.com/apache/nuttx/pull/12923) mm/map/vm_region.c: Fix usage of void* arithmetics
+* [#12946](https://github.com/apache/nuttx/pull/12946) mm/mempool: rename the mempool_alloc and mempool_free function
+* [#12659](https://github.com/apache/nuttx/pull/12659) mm_ubsan: add dummy to bypass runtime actions
+* [#12646](https://github.com/apache/nuttx/pull/12646) mm_ubsan: add implement for dynamic_type_cache_miss
+libc
+* [#12672](https://github.com/apache/nuttx/pull/12672) add rint and expm1 function to cmath from libm
+* [#13420](https://github.com/apache/nuttx/pull/13420) Add dummy implementations for `shm_open` `pthread_setaffinity_np` and `RLIMIT_RTPRIO`
+* [#13429](https://github.com/apache/nuttx/pull/13429) arm64_task/pthread_start: Convert the C / inline ASM code to assembly
+* [#13366](https://github.com/apache/nuttx/pull/13366) arm64/task/pthread_start: Fix rare issue with context register location
+* [#13011](https://github.com/apache/nuttx/pull/13011) lib_getcwd:Fix the Name in the function description.
+* [#12966](https://github.com/apache/nuttx/pull/12966) lib_remove:Repair the logical judgment
+* [#12890](https://github.com/apache/nuttx/pull/12890) libc: Add macro restrictions to code that uses floating point numbers
+* [#13111](https://github.com/apache/nuttx/pull/13111) libc: compile stackchk function by default
+* [#12953](https://github.com/apache/nuttx/pull/12953) libs: fix the default value of process-shared attribute
+* [#12975](https://github.com/apache/nuttx/pull/12975) libs: fix the default value of process-shared attribute
+* [#12605](https://github.com/apache/nuttx/pull/12605) libc: scanf, printf %z change switch const to if
+* [#12585](https://github.com/apache/nuttx/pull/12585) libc/execinfo: extract a common backtrace format function
+* [#13013](https://github.com/apache/nuttx/pull/13013) libc/msic: Implement get_nprocs API
+* [#13381](https://github.com/apache/nuttx/pull/13381) libc/misc/crc32: crc32 add slow mode, optional decrease size
+* [#13441](https://github.com/apache/nuttx/pull/13441) libc/netdb: Remove unnecessary CONFIG_LIBC_NETDB checks
+* [#13025](https://github.com/apache/nuttx/pull/13025) libc/netdb: Separate IPv4 and IPv6 cache size limit
+* [#13220](https://github.com/apache/nuttx/pull/13220) libc/sysconf: add _SC_GETPW_R_SIZE_MAX
+* [#13479](https://github.com/apache/nuttx/pull/13479) libc/time: add g_lcl_lock to protect local context in localsub
+* [#13080](https://github.com/apache/nuttx/pull/13080) libc/time: remove lib_strptime
+* [#12693](https://github.com/apache/nuttx/pull/12693) libc/unistd: added an implementation of the lib_flock function
+* [#12609](https://github.com/apache/nuttx/pull/12609) libc/x86_64: port string functions from bionic
+* [#13110](https://github.com/apache/nuttx/pull/13110) libcxxabi: libcxxabi enables exceptions by default
+* [#13079](https://github.com/apache/nuttx/pull/13079) libs/libc/obstack: correctly append null byte at the end of string
+* [#13482](https://github.com/apache/nuttx/pull/13482) libs/libc/obstack: implement ptr and int growing functions
+* [#13495](https://github.com/apache/nuttx/pull/13495) libs/libc/obstack: revert invalid null byte append to obstack_vprintf
+* [#13185](https://github.com/apache/nuttx/pull/13185) libs/libc/stdio/*printf *scanf:Add string serialization and deserialization functions
+* [#13294](https://github.com/apache/nuttx/pull/13294) libs/libm: fix epsilon relaxation in log and logf
+* [#13307](https://github.com/apache/nuttx/pull/13307) libs/libm/libm: apply epsilon relax factor only if epsilon is small
+* [#12568](https://github.com/apache/nuttx/pull/12568) libm{libm|newlib}: fix broken sincos optimization for GCC
+* [#12811](https://github.com/apache/nuttx/pull/12811) libm/copysign: respect signed zero/NaN handling in copysign
+* [#13174](https://github.com/apache/nuttx/pull/13174) syscall: delete getrandom in syscall because it have moved to lib
+* [#13428](https://github.com/apache/nuttx/pull/13428) gdb plugin: Encapsulate the gdb native command gcore as nxgcore
+* [#12557](https://github.com/apache/nuttx/pull/12557) gdbstub: fix typo
+* [#12549](https://github.com/apache/nuttx/pull/12549) gdbstub: support gdbstub_debugpoint_add/remove smp call
+* [#13339](https://github.com/apache/nuttx/pull/13339) nuttx/pthread: export priority protect in pthread with ceiling priority in semaphore
+* [#12561](https://github.com/apache/nuttx/pull/12561) pthread: add pthread_self/pthread_gettid_np function
+* [#13462](https://github.com/apache/nuttx/pull/13462) pthread_mutx: remove unused critical_secton lock
+* [#13456](https://github.com/apache/nuttx/pull/13456) pthread_mutex: add deadlock assert
+tools
+* [#12701](https://github.com/apache/nuttx/pull/12701) Feature/mcuboot toolchain support
+* [#13021](https://github.com/apache/nuttx/pull/13021) tools: add improved pre-commit tool
+* [#12794](https://github.com/apache/nuttx/pull/12794) tools: nxstyle if statement check
+* [#12651](https://github.com/apache/nuttx/pull/12651) tools/imx9: prepare bootable bootloader image
+* [#12838](https://github.com/apache/nuttx/pull/12838) tools/[Rust|D]: Fix build break for RISC-V
+* [#12854](https://github.com/apache/nuttx/pull/12854) tools/[Rust|D]: Fix the Rust and D Builds for QEMU RISC-V
+* [#12983](https://github.com/apache/nuttx/pull/12983) tools/parsetrace.py:fix parsetrace script error
+* [#13321](https://github.com/apache/nuttx/pull/13321) greenhills support: add ghs linker script for mps2-an500 platform
+* [#12884](https://github.com/apache/nuttx/pull/12884) greenhills support: add Kconfig, makefile, make.defs support for ghs compiler
+* [#12887](https://github.com/apache/nuttx/pull/12887) greenhills support: add new platform of qemu cortex-m7
+* [#13146](https://github.com/apache/nuttx/pull/13146) greenhills support: add the "__sync_synchronize" func impl
+* [#12877](https://github.com/apache/nuttx/pull/12877) greenhills support: add up_getsp() implementation to adapting greenhills compiler
+* [#12883](https://github.com/apache/nuttx/pull/12883) greenhills support: fix the asm build error for adapting to greenhills compiler
+* [#12885](https://github.com/apache/nuttx/pull/12885) greenhills support: fix the build and link error specific to ghs platform
+* [#13144](https://github.com/apache/nuttx/pull/13144) greenhills support: fix the build options warning
+* [#13207](https://github.com/apache/nuttx/pull/13207) greenhills support: fix the build option warning
+* [#13145](https://github.com/apache/nuttx/pull/13145) greenhills support: fix the build warning while support greenhills build
+* [#12886](https://github.com/apache/nuttx/pull/12886) greenhills support: fix the build warning for ghs platform
+* [#13533](https://github.com/apache/nuttx/pull/13533) greenhills support: fix the enumerated type mixed using warning
+* [#13322](https://github.com/apache/nuttx/pull/13322) greenhills support: fix the ghs build warning
+* [#13502](https://github.com/apache/nuttx/pull/13502) greenhills support: fix the greenhills compile warning on sizeof operand
+* [#13195](https://github.com/apache/nuttx/pull/13195) greenhills support: fix the pointless comparison build warning
+various
+* [#12552](https://github.com/apache/nuttx/pull/12552) compiler.h: rename CMSE extension attribute macros
+* [#12874](https://github.com/apache/nuttx/pull/12874) fix stm32wl5_rcc.h: Add the missing argument to RCC_PLLCFG_PLLP define.
+* [#13148](https://github.com/apache/nuttx/pull/13148) include/fcntl.h: add O_LARGEFILE flags
+* [#13324](https://github.com/apache/nuttx/pull/13324) include/sensors: import public definitions types and to uorb.h
+* [#12690](https://github.com/apache/nuttx/pull/12690) ioctl.h: add SIOCATMARK definition to resolve compilation errors
+* [#13314](https://github.com/apache/nuttx/pull/13314) ip6_tables.h: fix gcc 14 errors
+* [#13257](https://github.com/apache/nuttx/pull/13257) socketlin : add lin.h and lin bus-type
+* [#12692](https://github.com/apache/nuttx/pull/12692) sysinfo.h: add get_nprocs_conf/get_nprocs definition
+* [#13149](https://github.com/apache/nuttx/pull/13149) sys/shm.h: add macro define for posix
+* [#12594](https://github.com/apache/nuttx/pull/12594) x86_64/irq.h: use 32bit operations in up_cpu_index(
+
+Build System
+New Features
+* [#12904](https://github.com/apache/nuttx/pull/12904) [Cross-Platform] Remove Unix-specific code in savedefconfig and replace it with cmake script
+* [#12910](https://github.com/apache/nuttx/pull/12910) [cmake] add_application supports only registration but not compilation
+* [#12964](https://github.com/apache/nuttx/pull/12964) [cmake] split the archive process to avoid parameter too long problems
+* [#13019](https://github.com/apache/nuttx/pull/13019) [cmake] add nuttx_post and app_context inter targets for timing control
+* [#12908](https://github.com/apache/nuttx/pull/12908) [Win32 sim] enable win32 native platfrom sim compilation by CMake fix compilation error
+* [#12900](https://github.com/apache/nuttx/pull/12900) arch/sim/src/cmake/Toolchain.cmake: macOS fix unknown options: --gc-sections
+* [#12856](https://github.com/apache/nuttx/pull/12856) build: Fix libc/pwd CMakeLists.txt
+* [#13347](https://github.com/apache/nuttx/pull/13347) build: fix memory manager compile options for CMake
+* [#12859](https://github.com/apache/nuttx/pull/12859) build: Fix Toolchain.cmake for CONFIG_SIM_ASAN enabled
+* [#12880](https://github.com/apache/nuttx/pull/12880) build: set CMake policy to allow FetchContent_Populate
+* [#12784](https://github.com/apache/nuttx/pull/12784) build/cmake: add user_ldscript preprocessing
+* [#12866](https://github.com/apache/nuttx/pull/12866) build/cmake: fix system include dir for PROTECTED mode
+* [#13143](https://github.com/apache/nuttx/pull/13143) board/maix-bit: initial cmake support
+* [#13090](https://github.com/apache/nuttx/pull/13090) board/qemu-armv7a: add CMake support
+* [#12868](https://github.com/apache/nuttx/pull/12868) boards/rv-virt: cmake for pnsh and nsbi
+* [#13175](https://github.com/apache/nuttx/pull/13175) Cmake: [arch arm] added initial support for MSYS2
+* [#13389](https://github.com/apache/nuttx/pull/13389) cmake: add support for PCI
+* [#12516](https://github.com/apache/nuttx/pull/12516) cmake: reuse OpenAMP own CMake script for CMake build
+* [#12592](https://github.com/apache/nuttx/pull/12592) cmake: refine sim cmake redefine symbols
+* [#13449](https://github.com/apache/nuttx/pull/13449) cmake: Refactor extra_lib tagert,build include_arch path,refine sim link script target
+* [#12667](https://github.com/apache/nuttx/pull/12667) cmake: strip file full path to save the code size
+* [#13451](https://github.com/apache/nuttx/pull/13451) cmake: support openlibm,dhara,libmcs,lic regex CMake build scripts
+* [#12608](https://github.com/apache/nuttx/pull/12608) cmake/add_library: enable library install by default
+* [#12714](https://github.com/apache/nuttx/pull/12714) cmake/boards: fix build break on custom board
+* [#13085](https://github.com/apache/nuttx/pull/13085) CMakeLists.txt: warning D9002 on Windows + msvc
+* [#13253](https://github.com/apache/nuttx/pull/13253) cmake/nuttx_kconfig.cmake: fixed the correct .config path in the buid folder
+* [#13276](https://github.com/apache/nuttx/pull/13276) cmake/tricore: filter out nostdlib in linker phase to avoid build break
+* [#13499](https://github.com/apache/nuttx/pull/13499) libc: add missing preadv/pwritev in CMakeLists.txt
+* [#12700](https://github.com/apache/nuttx/pull/12700) riscv/cmake: fix Toolchain.cmake
+* [#12694](https://github.com/apache/nuttx/pull/12694) riscv/k230: fix apps ROMFS cmake
+* [#12996](https://github.com/apache/nuttx/pull/12996) riscv/qemu-rv: add RPTUN cmake
+* [#12634](https://github.com/apache/nuttx/pull/12634) sim/cmake: enable garbage collection of unused input sections
+* [#12721](https://github.com/apache/nuttx/pull/12721) tools/testbuild.sh: add option -N use CMake with Ninja
+* [#12805](https://github.com/apache/nuttx/pull/12805) tools/testbuild.sh: added store compilation artifacts for cmake
+* [#12724](https://github.com/apache/nuttx/pull/12724) tricore/cmake: add support of cmake build for tricore
+Bug Fixes
+* [#12558](https://github.com/apache/nuttx/pull/12558) [bugfix] cmake:fix a few issues during CMake build
+* [#12915](https://github.com/apache/nuttx/pull/12915) [bugfix] fix CMake build block when enable LTO
+* [#12582](https://github.com/apache/nuttx/pull/12582) Fix cmake for cxd56xx
+* [#12581](https://github.com/apache/nuttx/pull/12581) cmake: Fix build failure when -DNUTTX_APPS_DIR is specified
+* [#13171](https://github.com/apache/nuttx/pull/13171) CMake: fix CMake compile errors during the protected build mode
+* [#13081](https://github.com/apache/nuttx/pull/13081) cmake: fix invalid syntax when generating version.h from tags
+
+Architectural Support
+unsorted
+* [#12827](https://github.com/apache/nuttx/pull/12827) Additional encoder for F7 and added functions for TimerHook for F745 …
+* [#12924](https://github.com/apache/nuttx/pull/12924) Bugfix/esp spi fix
+* [#12770](https://github.com/apache/nuttx/pull/12770) Enable SMPS for STM32H745I-DISCO by default
+* [#12574](https://github.com/apache/nuttx/pull/12574) arch: Add --whole-archive linker option for some of architectures
+* [#13200](https://github.com/apache/nuttx/pull/13200) arch: cxd56xx: Add logic for i2c reset
+* [#13496](https://github.com/apache/nuttx/pull/13496) arch: cxd56xx: Fix issue by update of inode reference
+* [#13201](https://github.com/apache/nuttx/pull/13201) arch: cxd56xx: Fix SCU sensor data format
+* [#12962](https://github.com/apache/nuttx/pull/12962) arch: inline this_task to improve performence
+* [#13270](https://github.com/apache/nuttx/pull/13270) arch: remove unused up_cpu_pausereq waiting
+* [#13423](https://github.com/apache/nuttx/pull/13423) arch: use up_current_regs/up_set_current_regs replace CURRENT_REGS
+* [#13041](https://github.com/apache/nuttx/pull/13041) arch/EXTRA_LIBS: link all staging library.
+* [#12624](https://github.com/apache/nuttx/pull/12624) arch/sim: add custom data section support
+* [#12909](https://github.com/apache/nuttx/pull/12909) arch/sim/Kconfig: set SIM_FBBPP to 32 by default
+* [#12845](https://github.com/apache/nuttx/pull/12845) arch/stm32h7: add defines for USART clock selection
+* [#13292](https://github.com/apache/nuttx/pull/13292) arch/xmc4 : Add input pin DX0 selection for multiple SPI channel
+* [#12823](https://github.com/apache/nuttx/pull/12823) arch/xmc4 : Fixed critical section in i2c_transfer
+* [#12761](https://github.com/apache/nuttx/pull/12761) arch/xmc4 : i2c master lower-half driver
+* [#12545](https://github.com/apache/nuttx/pull/12545) BL808: Add support for UARTs 0-2 and serial configuration
+* [#12575](https://github.com/apache/nuttx/pull/12575) BL808: Replace courier with M0 interrupt controller
+* [#12795](https://github.com/apache/nuttx/pull/12795) elf: Enable ELF loader if text heap read is word-aligned and enable ELF loader for ESP32-S3
+* [#12620](https://github.com/apache/nuttx/pull/12620) esp32: add simple boot support
+* [#12616](https://github.com/apache/nuttx/pull/12616) ESP32: emac initialization adding cpu id
+* [#13249](https://github.com/apache/nuttx/pull/13249) esp32: enable APP_CPU cache earlier
+* [#13244](https://github.com/apache/nuttx/pull/13244) esp32: cache_sram_mmu_set: update the correct register bits
+* [#13222](https://github.com/apache/nuttx/pull/13222) esp32: fix a crash with PSRAM + SMP
+* [#13243](https://github.com/apache/nuttx/pull/13243) esp32: fix seemingly wrong calculations
+* [#13250](https://github.com/apache/nuttx/pull/13250) esp32: psram_set_cs_timing: sync with esp-idf
+* [#13311](https://github.com/apache/nuttx/pull/13311) esp32: Port the bootloader patch
+* [#12572](https://github.com/apache/nuttx/pull/12572) esp32[c3|c6|h2]: Add I2C master support
+* [#12573](https://github.com/apache/nuttx/pull/12573) esp32[c3|c6|h2]: Add GDMA support
+* [#13298](https://github.com/apache/nuttx/pull/13298) esp32c6: PCNT Quadrature Encoder driver
+* [#13269](https://github.com/apache/nuttx/pull/13269) esp32s2: fix SPI flash and file system mounting
+* [#12647](https://github.com/apache/nuttx/pull/12647) esp32s3-devkit: add a config for qemu
+* [#12851](https://github.com/apache/nuttx/pull/12851) esp32s3-devkit/toywasm: enable ESP32S3_SPI_FLASH_SUPPORT_PSRAM_STACK
+* [#12725](https://github.com/apache/nuttx/pull/12725) esp32s3_textheap.c: fix a build error w/o CONFIG_ESP32S3_SPIRAM
+* [#12565](https://github.com/apache/nuttx/pull/12565) esp32s3/wifi: Fix bug related to IOB off-loading with SMP
+* [#12789](https://github.com/apache/nuttx/pull/12789) esp32s3/i2s: Fix faulty initialization when SMP is enabled
+* [#13265](https://github.com/apache/nuttx/pull/13265) esp32_psram.c: Remove a seemingly stale comment
+* [#12669](https://github.com/apache/nuttx/pull/12669) Feature/esp mcuboot support
+* [#12776](https://github.com/apache/nuttx/pull/12776) Feature/esp spi dma
+* [#12775](https://github.com/apache/nuttx/pull/12775) Feature/esp temperature sensor
+* [#12604](https://github.com/apache/nuttx/pull/12604) fix(esp32-qemu-openeth): allocate buffers in internal memory
+* [#13193](https://github.com/apache/nuttx/pull/13193) gd32f4xx_at24: Fix uninitialized use of local variables i2c and at24
+* [#13401](https://github.com/apache/nuttx/pull/13401) Imx9 ethernet fixes
+* [#12632](https://github.com/apache/nuttx/pull/12632) Imx9 support flexspi m25p nor
+* [#13399](https://github.com/apache/nuttx/pull/13399) imx9/edma: Fix function prototypes
+* [#13400](https://github.com/apache/nuttx/pull/13400) imx9/LPUART fixes
+* [#12921](https://github.com/apache/nuttx/pull/12921) imx93: Add more base addresses
+* [#12623](https://github.com/apache/nuttx/pull/12623) imxrt: Correctly update PLL, bit has to toggled instead of being set
+* [#12562](https://github.com/apache/nuttx/pull/12562) imxrt: imxrt11xx set core clock to 1p15v regardless of ocotp
+* [#12821](https://github.com/apache/nuttx/pull/12821) k230_start.c: Fix condition for k230_copy_init_data()
+* [#12894](https://github.com/apache/nuttx/pull/12894) mps3-an547:support mps3-an547 reset
+* [#12989](https://github.com/apache/nuttx/pull/12989) nuttx/sim:By default, stack-use-after-return is not checked when enabling SIM_ASAN.
+* [#13043](https://github.com/apache/nuttx/pull/13043) nuttx/sim:By default, stack-use-after-return is not checked when enabling SIM_ASAN.
+* [#13548](https://github.com/apache/nuttx/pull/13548) nrf91: Update GPS to GNSS
+* [#12612](https://github.com/apache/nuttx/pull/12612) refactor(esp32-qemu-openeth): use lower half driver interface
+* [#12660](https://github.com/apache/nuttx/pull/12660) refresh esp32s3-devkit:qemu_debug
+* [#12707](https://github.com/apache/nuttx/pull/12707) rp2040 Rename the RP2040-specific PWM_MULTICHAN definition
+* [#12610](https://github.com/apache/nuttx/pull/12610) rp2040: Add support to MAX6675
+* [#13318](https://github.com/apache/nuttx/pull/13318) rp2040: Support pico-sdk 2.0.0
+* [#13070](https://github.com/apache/nuttx/pull/13070) Sync the modifications of the WiFi function in simulator.
+* [#12697](https://github.com/apache/nuttx/pull/12697) s32k1xx: FlexIO i2c driver
+* [#12678](https://github.com/apache/nuttx/pull/12678) samv7: fix compile warning in PWM driver
+* [#12627](https://github.com/apache/nuttx/pull/12627) samv7/sam_mcan.c: fix TSEG1, TSEG2 and SJW compile warnings for MCAN1
+* [#12622](https://github.com/apache/nuttx/pull/12622) sim: make possible keep ubsan and bypass feature
+* [#13034](https://github.com/apache/nuttx/pull/13034) sim: read the second buffer
+* [#13097](https://github.com/apache/nuttx/pull/13097) sim: Support to use of non-consecutive framebuffers
+* [#13355](https://github.com/apache/nuttx/pull/13355) sim_offload: add lame library to apps/audioutils/lame
+* [#12870](https://github.com/apache/nuttx/pull/12870) sim/login: remove login restrictions to improve the experience for green hands
+* [#13534](https://github.com/apache/nuttx/pull/13534) sim/minmea: Fix defconfig warning
+* [#13042](https://github.com/apache/nuttx/pull/13042) simwifi: Add the netlink event of connect/disconnect.
+* [#12778](https://github.com/apache/nuttx/pull/12778) Small improvements to nrf91
+* [#13282](https://github.com/apache/nuttx/pull/13282) smp: enable smp_call in all smp arch
+* [#12566](https://github.com/apache/nuttx/pull/12566) STM32G47XXX: Added basic HRTIM support.
+* [#12600](https://github.com/apache/nuttx/pull/12600) tee smp support
+* [#12640](https://github.com/apache/nuttx/pull/12640) Userleds support to seed-xiao-rp2040
+* [#13032](https://github.com/apache/nuttx/pull/13032) wifi_sim.c:fix compile warning
+
+Architecture Improvements
+arm
+* [#12626](https://github.com/apache/nuttx/pull/12626) arch/arm/stm32: Fix EXTI lines definitions for STM32G47XX.
+* [#12664](https://github.com/apache/nuttx/pull/12664) arch/armv8-r: new config to set SPIs Configuration to edge-triggered
+* [#12666](https://github.com/apache/nuttx/pull/12666) arch/armv8-r: update g_running_tasks before context switch
+* [#13472](https://github.com/apache/nuttx/pull/13472) arch/arm-m: Clear lr before jump to __start
+* [#13284](https://github.com/apache/nuttx/pull/13284) arch/arm: support kernel heap in BUILD_FLAT mode
+* [#13416](https://github.com/apache/nuttx/pull/13416) arm generate busfault & recursive bug fix
+* [#13268](https://github.com/apache/nuttx/pull/13268) arm: armv7-a/r and armv8-r up_cpu_index inline
+* [#13024](https://github.com/apache/nuttx/pull/13024) arm: Fix DS1307 initialization for common STM32 logic
+* [#12888](https://github.com/apache/nuttx/pull/12888) arm: Select ram vector on armv6m
+* [#13505](https://github.com/apache/nuttx/pull/13505) arm_addrenv:fix app crash when enable shm in kernel mode
+* [#12787](https://github.com/apache/nuttx/pull/12787) arm_backtrace_unwind:Make the backtrace search the entire stack as much as possible
+* [#12954](https://github.com/apache/nuttx/pull/12954) arm/armv[7|8]-m: add syn barrier for MPU ops
+* [#12925](https://github.com/apache/nuttx/pull/12925) arm/armv8-r: invalidate d-cache on boot
+* [#12928](https://github.com/apache/nuttx/pull/12928) arm/armv8-r: add cp15 ops for mpu
+* [#13529](https://github.com/apache/nuttx/pull/13529) arm/cortex-a,r: replace cp15 instruct to macros to align operation
+* [#13239](https://github.com/apache/nuttx/pull/13239) arm/giv3: add g_ prefix to some global variables
+* [#13262](https://github.com/apache/nuttx/pull/13262) arm/gicv3: set routing affinity before enable IRQ
+* [#13240](https://github.com/apache/nuttx/pull/13240) arm/linum-stm32h753bi: Add support to RFID MFRC522
+* [#12873](https://github.com/apache/nuttx/pull/12873) arm/lm3s6965-ek: Disable NTPC for lm3s6965 to fix maximum flash space…
+* [#13557](https://github.com/apache/nuttx/pull/13557) arm/qemu: Add mounting of tmpfs
+* [#13117](https://github.com/apache/nuttx/pull/13117) arm/qemu: enable WFI in `up_idle`
+* [#13131](https://github.com/apache/nuttx/pull/13131) arm/spinlock: up_testset() sould not depends on SMP
+* [#12879](https://github.com/apache/nuttx/pull/12879) arm/stm32f401rc-rs485: Add support to BMP280 sensor
+* [#13565](https://github.com/apache/nuttx/pull/13565) arm/stm32f401rc-rs485: Add support to LCD 16x2 with I2C Backpack
+* [#12839](https://github.com/apache/nuttx/pull/12839) arm/stm32f401rc-rs485: Add support to RFID MFRC522
+* [#12860](https://github.com/apache/nuttx/pull/12860) arm/stm32h7/stm32h745i-disco: Add STM32H745I-DISCO Per Core Support
+* [#12902](https://github.com/apache/nuttx/pull/12902) arm/stm32h7x3x_rcc.c: Add External Power Supply option to stm32h7x3x …
+* [#12679](https://github.com/apache/nuttx/pull/12679) arm/xmc4: pwm driver
+* [#13466](https://github.com/apache/nuttx/pull/13466) armv7-a gic related update
+* [#13176](https://github.com/apache/nuttx/pull/13176) armv7-a timer:fix timer overflow.
+* [#12956](https://github.com/apache/nuttx/pull/12956) armv7a/irq: enable fiq in tee, enable irq in ap
+* [#13453](https://github.com/apache/nuttx/pull/13453) armv8-m:arch libc function need save ip register use pacbti
+* [#13237](https://github.com/apache/nuttx/pull/13237) armv8-r/gicv3: correct cpu index of irouter
+* [#13275](https://github.com/apache/nuttx/pull/13275) armv8-r/r52: add neon support into compiler lin
+
+arm64
+* [#12633](https://github.com/apache/nuttx/pull/12633) arch/arm64/src/imx9/imx9_lowputc.c: Fix an arithmetic sign error in d…
+* [#12648](https://github.com/apache/nuttx/pull/12648) arch/arm64: allow to use custom up_idle
+* [#13397](https://github.com/apache/nuttx/pull/13397) arch/arm64/src/imx9/imx9_lpi2c.c: Cleanups and error fixes
+* [#13402](https://github.com/apache/nuttx/pull/13402) arch/arm64/imx9: Change Kconfig logic
+* [#13403](https://github.com/apache/nuttx/pull/13403) arch/arm64/imx9: Add system reset controller
+* [#13427](https://github.com/apache/nuttx/pull/13427) arch/arm64/src/imx9/imx9_lpi2c.c: Ignore spurious RX interrupts
+* [#13218](https://github.com/apache/nuttx/pull/13218) arch/arm64: Move ELF_64BIT selection to arch/Kconfig
+* [#12681](https://github.com/apache/nuttx/pull/12681) arm64: add initial support for ZYNQ MPSOC and ZCU111 Evaluation Kit
+* [#12580](https://github.com/apache/nuttx/pull/12580) arm64: inline up_cpu_index
+* [#13560](https://github.com/apache/nuttx/pull/13560) arm64_addrenv: Add support for 4 level MMU translations
+* [#13363](https://github.com/apache/nuttx/pull/13363) arm64_addrenv_pgmap.c: Revoke user execution access to kernel mmap'd pages
+* [#13364](https://github.com/apache/nuttx/pull/13364) arm64_addrenv.c: Flush kernel page table copy to user mappings
+* [#13204](https://github.com/apache/nuttx/pull/13204) arm64_checkstack.c: Fix traversing of user stack when ARCH_ADDRENV=Y
+* [#13361](https://github.com/apache/nuttx/pull/13361) arm64_syscall.c: Don't need to set register context during syscall
+* [#13365](https://github.com/apache/nuttx/pull/13365) arm64_vector_table.S: Remove unnecessary instruction
+* [#12695](https://github.com/apache/nuttx/pull/12695) arm64/arm64_boot.c: Fix exception caused by accesses to ICC_SRE_EL3 when GICv3 was not implemented
+* [#13373](https://github.com/apache/nuttx/pull/13373) arm64/crt0.c: Fix stack alignment when executing signal trampoline
+* [#12649](https://github.com/apache/nuttx/pull/12649) arm64/imx9: ccm: add default clk init
+* [#13205](https://github.com/apache/nuttx/pull/13205) arm64/imx9: Force 64-bit ELF format
+* [#13360](https://github.com/apache/nuttx/pull/13360) arm64/mmu: Fixes for MMU driver
+* [#13362](https://github.com/apache/nuttx/pull/13362) arm64/syscall: (Re-)enable interrupts only if they were previously enable
+
+tricore
+* [#12682](https://github.com/apache/nuttx/pull/12682) arch/tricore: add support of tricore gcc toolchain
+* [#12706](https://github.com/apache/nuttx/pull/12706) arch/tricore: synchronize instruction/data following MTCR/MFC
+
+risc-v
+* [#12961](https://github.com/apache/nuttx/pull/12961) arch: inline up_testset in arm arm64 riscv xtensa
+* [#12579](https://github.com/apache/nuttx/pull/12579) arch/riscv: add all region in NAPOT
+* [#12881](https://github.com/apache/nuttx/pull/12881) arch/riscv: add cluster local hartid
+* [#12906](https://github.com/apache/nuttx/pull/12906) arch/riscv: fix IRQ_SOFT for non-SMP
+* [#12546](https://github.com/apache/nuttx/pull/12546) arch/riscv: fix NuttSBI PMP config
+* [#12717](https://github.com/apache/nuttx/pull/12717) arch/riscv: fix trap sp restore logic
+* [#13430](https://github.com/apache/nuttx/pull/13430) arch/riscv: Fixed hardware timer warps-around issue
+* [#13278](https://github.com/apache/nuttx/pull/13278) arch/riscv: revert pull#12864
+* [#12864](https://github.com/apache/nuttx/pull/12864) arch/riscv: unify in-kernel syscall
+* [#12619](https://github.com/apache/nuttx/pull/12619) arch/risc-v: add support for capture driver on ESP32C6 and ESP32H2.
+* [#12726](https://github.com/apache/nuttx/pull/12726) arch/risc-v: make common up_allocate_heap weak symbol
+* [#12732](https://github.com/apache/nuttx/pull/12732) arch/risc-v: does not clear IPI address in S mode
+* [#12460](https://github.com/apache/nuttx/pull/12460) arch/risc-v/common: provide architecture specific perfmon bindings.
+* [#13353](https://github.com/apache/nuttx/pull/13353) arch/risc-v/litex: Fix the litex arty_a7 build
+* [#13382](https://github.com/apache/nuttx/pull/13382) arch/risc-v/src/litex: Claim all pending PLIC interrupts.
+* [#13547](https://github.com/apache/nuttx/pull/13547) arch/risc-v/src/litex_ticked: Set initial tick count to known value.
+* [#12804](https://github.com/apache/nuttx/pull/12804) arch/risc-v: introduce AIA support
+* [#12843](https://github.com/apache/nuttx/pull/12843) arch/risc-v: add support for DC motor control on ESP32|C6|H2|
+* [#12586](https://github.com/apache/nuttx/pull/12586) riscv_exception.c: Add missing comma in exception reasons array
+* [#13408](https://github.com/apache/nuttx/pull/13408) riscv_mtimer: modify riscv_mtimer_current to reduce precision lost
+* [#12643](https://github.com/apache/nuttx/pull/12643) riscv_tcbinfo: Fix register ordering for PC
+* [#13564](https://github.com/apache/nuttx/pull/13564) riscv: add a return value to riscv_swint
+* [#13561](https://github.com/apache/nuttx/pull/13561) riscv: g_current_regs is only used to determine if we are in irq
+* [#12812](https://github.com/apache/nuttx/pull/12812) riscv: Fix fork() system call
+* [#13354](https://github.com/apache/nuttx/pull/13354) riscv: Unify the extended context save/restore
+* [#12554](https://github.com/apache/nuttx/pull/12554) riscv: Initial support for debug trigger module
+* [#12559](https://github.com/apache/nuttx/pull/12559) riscv: Improve exception and irq mapping
+* [#12809](https://github.com/apache/nuttx/pull/12809) riscv/debug: Add support for steppoint
+* [#12819](https://github.com/apache/nuttx/pull/12819) riscv/espressif: Mark private data as static in esp_spi.c
+* [#12861](https://github.com/apache/nuttx/pull/12861) riscv/fork: fix fp/gp handling
+* [#12589](https://github.com/apache/nuttx/pull/12589) riscv/k230: revise canmv230:nsbi
+* [#12677](https://github.com/apache/nuttx/pull/12677) riscv/k230: updates for nsh and pnsh
+* [#12744](https://github.com/apache/nuttx/pull/12744) riscv/nsbi: fix k230 AMP confs
+* [#12799](https://github.com/apache/nuttx/pull/12799) riscv/qemu-rv: skip reloading mhartid
+* [#12807](https://github.com/apache/nuttx/pull/12807) riscv/qemu-rv: Add BUILD_PROTECTED target for rv-virt
+* [#12944](https://github.com/apache/nuttx/pull/12944) riscv/qemu-rv: add RPTUN support
+* [#12772](https://github.com/apache/nuttx/pull/12772) riscv/rv-virt: use RAM_START in ld.script
+* [#12816](https://github.com/apache/nuttx/pull/12816) riscv/qemu-rv: add NuttSBI target for rv-virt
+* [#12831](https://github.com/apache/nuttx/pull/12831) riscv/qemu-rv: revise PROTECTED mode
+* [#12840](https://github.com/apache/nuttx/pull/12840) riscv/nsbi: fix up_udelay for rv32
+* [#13510](https://github.com/apache/nuttx/pull/13510) risc-v: Add a new option to control exception reason
+* [#12722](https://github.com/apache/nuttx/pull/12722) risc-v/bl808, sg2000: Configure MMU to cache Kernel Text, Data and Heap (T-Head C906)
+* [#12571](https://github.com/apache/nuttx/pull/12571) risc-v/bl808: Add GPIO Driver
+* [#12621](https://github.com/apache/nuttx/pull/12621) risc-v/bl808: Add GPADC character driver
+* [#12663](https://github.com/apache/nuttx/pull/12663) risc-v/bl808: Add SPI driver
+* [#12771](https://github.com/apache/nuttx/pull/12771) risc-v/bl808: Add watchdog driver
+* [#12752](https://github.com/apache/nuttx/pull/12752) risc-v/bl808: Add timer driver
+* [#12614](https://github.com/apache/nuttx/pull/12614) risc-v/ox64: Add LED Driver
+* [#12762](https://github.com/apache/nuttx/pull/12762) risc-v/qemu-rv: Add LED Driver for QEMU RISC-V 32-bit and 64-bit
+xtensa
+* [#13223](https://github.com/apache/nuttx/pull/13223) Add spi slave dev to esp32 xtensa
+* [#13225](https://github.com/apache/nuttx/pull/13225) espressif: Fix build with RTC
+* [#13255](https://github.com/apache/nuttx/pull/13255) espressif: Fix deadlock in RT timer caused by critical section
+* [#12560](https://github.com/apache/nuttx/pull/12560) espressif: Fix error while evaluating Wi-Fi task ID
+* [#13368](https://github.com/apache/nuttx/pull/13368) espressif: Update external libraries to fix GPIO interrupt bug
+* [#13236](https://github.com/apache/nuttx/pull/13236) espressif: Update HAL library reference to include debug assert
+* [#13022](https://github.com/apache/nuttx/pull/13022) espressif: Update internal libraries reference
+* [#12551](https://github.com/apache/nuttx/pull/12551) xtensa: add support for capture driver on ESP32 and ESP32|S3|
+* [#12781](https://github.com/apache/nuttx/pull/12781) xtensa: add support for motor control driver
+* [#12967](https://github.com/apache/nuttx/pull/12967) xtensa_cache:add up_get_cachesize api
+* [#12865](https://github.com/apache/nuttx/pull/12865) xtensa/esp32: replace nxsig_usleep() with up_udelay()
+* [#12750](https://github.com/apache/nuttx/pull/12750) xtensa/esp32s3: Add peripheral DMA request return value and optimize DMA initialization
+* [#13277](https://github.com/apache/nuttx/pull/13277) xtensa/esp32s3: Add timing delay set interface for QSPI
+* [#13291](https://github.com/apache/nuttx/pull/13291) xtensa/esp32s2: add WiFi support
+* [#13454](https://github.com/apache/nuttx/pull/13454) xtensa/esp32s3: Adjust I2C clock timing
+* [#12720](https://github.com/apache/nuttx/pull/12720) xtensa/esp32s3: Deinitialize ESP32-S3 QSPI GDMA engine.
+* [#12871](https://github.com/apache/nuttx/pull/12871) xtensa/esp32s3: Update the rtc code to fix system blocking issue
+* [#12919](https://github.com/apache/nuttx/pull/12919) xtensa/esp32s3: partition name duplicate and free
+* [#12918](https://github.com/apache/nuttx/pull/12918) xtensa/esp32s3: reserve memory for a mutex struct depending on the OS
+* [#12932](https://github.com/apache/nuttx/pull/12932) xtensa/esp32s3: Separate address and command flag for QSPI DMA transfer
+* [#13165](https://github.com/apache/nuttx/pull/13165) xtensa/esp32s3/esp32s3_sdmmc.c: wait for command done event also on error response
+x86_64
+* [#13391](https://github.com/apache/nuttx/pull/13391) Add MSI/MSI-X support for intel64
+* [#12583](https://github.com/apache/nuttx/pull/12583) arch/intel64: add cpu specific data and per-cpu interrupt stacks
+* [#12803](https://github.com/apache/nuttx/pull/12803) arch/intel64: add support for HPET as system clock
+* [#12588](https://github.com/apache/nuttx/pull/12588) arch/intel64: add support for inter-processor signaling
+* [#12570](https://github.com/apache/nuttx/pull/12570) arch/intel64: get TSC frequency only when not provided from Kconfig
+* [#12801](https://github.com/apache/nuttx/pull/12801) arch/intel64/irq.h: rename rdtsc macros
+* [#13392](https://github.com/apache/nuttx/pull/13392) intel64: Improvements for HPET
+* [#12567](https://github.com/apache/nuttx/pull/12567) arch/x86_64: addrenv should add offset only for RAM region
+* [#12577](https://github.com/apache/nuttx/pull/12577) arch/x86_64/intel64/intel64_rtc.c: fix compilation
+* [#12591](https://github.com/apache/nuttx/pull/12591) arch/x86_64: add SMP support
+* [#13417](https://github.com/apache/nuttx/pull/13417) arch/x86_64: Add ARCH_INTEL64_DISABLE_CET
+* [#13409](https://github.com/apache/nuttx/pull/13409) arch/x86_64: Add ARCH_X86_64_IDLE_NOP and ARCH_X86_64_IDLE_MWAIT
+* [#13436](https://github.com/apache/nuttx/pull/13436) arch/x86_64: add basic support for R_X86_64_REX_GOTPCRELX relocation
+* [#13422](https://github.com/apache/nuttx/pull/13422) arch/x86_64: Add elf32 multiboot1 wrapper for NuttX binary
+* [#13313](https://github.com/apache/nuttx/pull/13313) arch/x86_64: convert all asm() to __asm__
+* [#13317](https://github.com/apache/nuttx/pull/13317) arch/x86_64: Fix wrong RDTSCP implementation
+* [#13316](https://github.com/apache/nuttx/pull/13316) arch/x86_64: Support QEMU PVH ELF loader
+* [#13426](https://github.com/apache/nuttx/pull/13426) arch/x86_64/intel64: fix compilation errors in intel64_oneshot_lower.c
+* [#12800](https://github.com/apache/nuttx/pull/12800) arch/x86_64/intel64/intel64_cpu.c: remove workaround for spin_lock
+* [#13390](https://github.com/apache/nuttx/pull/13390) qemu-intel64: restore functionality of PCI test configs
+* [#13315](https://github.com/apache/nuttx/pull/13315) qemu-intel64: simplify linker script
+* [#12597](https://github.com/apache/nuttx/pull/12597) x86_64: add AVX support
+* [#12613](https://github.com/apache/nuttx/pull/12613) x86_64: addrenv support
+* [#12569](https://github.com/apache/nuttx/pull/12569) x86_64: hide --whole-archive behind Kconfig option
+Driver Support
+New Driver Support
+* [#12829](https://github.com/apache/nuttx/pull/12829) Add amg88xx driver
+* [#13396](https://github.com/apache/nuttx/pull/13396) Add Intel e1000 and igc support
+* [#13393](https://github.com/apache/nuttx/pull/13393) Add support for 16550 compatible PCI serial cards
+* [#12715](https://github.com/apache/nuttx/pull/12715) Add support for the Sensirion SHT4x temperature and humidity sensor
+* [#12824](https://github.com/apache/nuttx/pull/12824) Add thermal framework
+* [#11605](https://github.com/apache/nuttx/pull/11605) Coresight: add init coresight driver framework
+* [#13082](https://github.com/apache/nuttx/pull/13082) driver/mem: add Mem Driver.
+* [#12834](https://github.com/apache/nuttx/pull/12834) driver/ssd1680: Add support for 1.54 inch e-paper display
+* [#12938](https://github.com/apache/nuttx/pull/12938) drivers/video: add goldfish gpu fb
+* [#13470](https://github.com/apache/nuttx/pull/13470) drivers/pinctl: add pinctrl framework
+* [#13471](https://github.com/apache/nuttx/pull/13471) drivers/goldfish-pipe: implement goldfish pipe
+* [#13553](https://github.com/apache/nuttx/pull/13553) Pci ep framework
+Drivers Improvements
+* [#12998](https://github.com/apache/nuttx/pull/12998) [driver][bcm43xxx] reset tx_seq of sido-bus when ifdown wlan-if
+* [#13154](https://github.com/apache/nuttx/pull/13154) can/sja1000: drop driver dependency on __builtin functions
+* [#13524](https://github.com/apache/nuttx/pull/13524) can: Add g_ prefix to can_dlc_to_len and len_to_can_dlc.
+* [#13141](https://github.com/apache/nuttx/pull/13141) can: Merge netpacket/can.h into nuttx/can.h
+* [#12676](https://github.com/apache/nuttx/pull/12676) driver/net/lan9250: Add lan9250_ioctl and lan9250_uninitialize APIs
+* [#13464](https://github.com/apache/nuttx/pull/13464) driver/ftl: Read the consecutive eraseblocks
+* [#13320](https://github.com/apache/nuttx/pull/13320) driver/usbdev: support userspace to access ep0
+* [#12641](https://github.com/apache/nuttx/pull/12641) drivers: add API for drivers early initialization
+* [#13492](https://github.com/apache/nuttx/pull/13492) drivers: fix gcc14 errors for virtio
+* [#13107](https://github.com/apache/nuttx/pull/13107) drivers/audio: fix samp rate conversion issue
+* [#13323](https://github.com/apache/nuttx/pull/13323) drivers/bch: fix uint32 overflow issue
+* [#12564](https://github.com/apache/nuttx/pull/12564) drivers/net/ksz9477: Add port mirroring support
+* [#12765](https://github.com/apache/nuttx/pull/12765) drivers/drivers_initialize.c: check if only one console is selected
+* [#13411](https://github.com/apache/nuttx/pull/13411) drivers/fb: add panbuffer clear ioctl
+* [#13468](https://github.com/apache/nuttx/pull/13468) drivers/gpio: support poll gpio device and optimize code to save memory
+* [#12976](https://github.com/apache/nuttx/pull/12976) drivers/input: enable touch/kbd/mouse for virtio input
+* [#13060](https://github.com/apache/nuttx/pull/13060) drivers/modem/alt1250: Disable the PIN feature in ALT1250
+* [#13327](https://github.com/apache/nuttx/pull/13327) drivers/mtd/bch: fix size_t overflow when offset > 4GB
+* [#13480](https://github.com/apache/nuttx/pull/13480) drivers/pty: support pty write to kill signal, like serial driver
+* [#12830](https://github.com/apache/nuttx/pull/12830) drivers/serial: Make the 16550 rx trigger level configurable
+* [#13202](https://github.com/apache/nuttx/pull/13202) drivers/regmap: add exit function interface.
+* [#13469](https://github.com/apache/nuttx/pull/13469) drivers/reset: support rpmsg reset
+* [#13328](https://github.com/apache/nuttx/pull/13328) drivers/rwbuffer: Bug fix: Set nblocks 0 after direct using wrflush
+* [#13434](https://github.com/apache/nuttx/pull/13434) drivers/serial
+* [#13576](https://github.com/apache/nuttx/pull/13576) drivers/syslog: compile syslog_device.c if console/char/file channel enabled
+* [#12857](https://github.com/apache/nuttx/pull/12857) drivers/touchscreen: add grab for touchscreen
+* [#13481](https://github.com/apache/nuttx/pull/13481) drivers/usbdev: minor update for cdcacm
+* [#12930](https://github.com/apache/nuttx/pull/12930) drivers/virtio-net: Support VIRTIO_F_ANY_LAYOUT
+* [#13170](https://github.com/apache/nuttx/pull/13170) drivers: Fix goldfish events x64 unresponsive interrupt issue
+* [#13531](https://github.com/apache/nuttx/pull/13531) Fix build error of drivers/sensors/usensor.c
+* [#13325](https://github.com/apache/nuttx/pull/13325) Input/ff: new driver frameworks for vibrator(haptic)
+* [#13078](https://github.com/apache/nuttx/pull/13078) video: fix warning & update sim camera
+* [#12760](https://github.com/apache/nuttx/pull/12760) virtio/serial: initial CONSOLE support
+* [#12971](https://github.com/apache/nuttx/pull/12971) mmcsd_sdio:Fix performing read and write in irq
+* [#12949](https://github.com/apache/nuttx/pull/12949) mmcsd: add support of getting ext_csd reg data
+* [#13157](https://github.com/apache/nuttx/pull/13157) mmcsd: add write ext csd reg support
+* [#13528](https://github.com/apache/nuttx/pull/13528) mmcsd: fix a logic error
+* [#13215](https://github.com/apache/nuttx/pull/13215) mmcsd: make a compatibility change for cmd12 and cmd23
+* [#13380](https://github.com/apache/nuttx/pull/13380) mtd:ramtron MB85RS256B address length is 2
+* [#13136](https://github.com/apache/nuttx/pull/13136) mtd:use part->name as partition name when CONFIG_MTD_PARTITION_NAMES set
+* [#12796](https://github.com/apache/nuttx/pull/12796) mtd/Kconfig: fix W25_SLOWREAD menu item.
+* [#13252](https://github.com/apache/nuttx/pull/13252) mtd/nvs: fix align size
+* [#13219](https://github.com/apache/nuttx/pull/13219) nuttx/drivers:Modify errcode returned by relay_ioctl
+* [#12848](https://github.com/apache/nuttx/pull/12848) Optimize iic and spi parts and add iic slave drivers
+* [#13344](https://github.com/apache/nuttx/pull/13344) pci ivshmem related driveres support
+* [#13337](https://github.com/apache/nuttx/pull/13337) Revert "Fix unwanted flush in the SPI slave driver"
+* [#13251](https://github.com/apache/nuttx/pull/13251) rndis: correct usb descriptor
+* [#13538](https://github.com/apache/nuttx/pull/13538) sensor:Fixed the problem of user information lag in cross-core communication "stublist".
+* [#13539](https://github.com/apache/nuttx/pull/13539) sensor_rpmsg.c:Fix that "stub" will be created when local core only has subscribers.
+* [#12927](https://github.com/apache/nuttx/pull/12927) serial/uart_16550: include stdint.h in uart_16550.h
+* [#13383](https://github.com/apache/nuttx/pull/13383) serial/uart_16550: remove up_putc spinlock
+* [#13384](https://github.com/apache/nuttx/pull/13384) serial/uart_pl011: default syslog needs to check flow control in up_putc
+* [#13509](https://github.com/apache/nuttx/pull/13509) serial/pci_16550: make sure that interrupts are disabled during init
+* [#13102](https://github.com/apache/nuttx/pull/13102) syslog_rpmsg: Ensure the syslog ept is ready when rpmsg_send
+* [#13184](https://github.com/apache/nuttx/pull/13184) timer driver:support poll.
+* [#13075](https://github.com/apache/nuttx/pull/13075) usb_cdcmbim: add mbim device driver
+* [#13367](https://github.com/apache/nuttx/pull/13367) usbdev: Add fastboot boardctl
+* [#12914](https://github.com/apache/nuttx/pull/12914) usbdev: add USB cdcncm device driver
+* [#12745](https://github.com/apache/nuttx/pull/12745) usbdev: delete unsigned comparison with 0
+* [#13216](https://github.com/apache/nuttx/pull/13216) usbdev: extend the usb req len to unit32_t
+* [#13190](https://github.com/apache/nuttx/pull/13190) USB 3.0 device side suppor
+
+Board Support
+New Boards
+* [#13248](https://github.com/apache/nuttx/pull/13248) arm: Add support for CSK6011A SOC and CSK6011A-NANO board
+* [#11709](https://github.com/apache/nuttx/pull/11709) at32uc3a0: Initial work for SimpleMachines' Mizar32-A
+* [#12813](https://github.com/apache/nuttx/pull/12813) boards/esp32s3: Add initial support to the ESP32-S3-Korvo-2 board
+* [#13467](https://github.com/apache/nuttx/pull/13467) boards/esp32s3: add support to esp32s3-lhcbit board
+Boards Improvements
+* [#13532](https://github.com/apache/nuttx/pull/13532) [Bugfix]Kconfig:ensure compatibility between kconfig-frontend and kconfiglib in kernel build
+* [#12698](https://github.com/apache/nuttx/pull/12698) Add defconfig to use the ws2812 driver
+* [#12878](https://github.com/apache/nuttx/pull/12878) arm/stm32f103-minimum: Use common board MFRC522
+* [#12922](https://github.com/apache/nuttx/pull/12922) arm64: Initial implementation of CONFIG_BUILD_KERNEL
+* [#13376](https://github.com/apache/nuttx/pull/13376) arm64/Kconfig: Make the ARM64_PA/VA_BITS a true Kconfig variable
+* [#12973](https://github.com/apache/nuttx/pull/12973) board/arm/rp2040/seeed-xiao-studio-rp2040 GPIO configuration
+* [#12738](https://github.com/apache/nuttx/pull/12738) board/linum-stm32h753bi: Add support to external sdram
+* [#12882](https://github.com/apache/nuttx/pull/12882) board/lm3s6965-ek: restore 128K kflash
+* [#12699](https://github.com/apache/nuttx/pull/12699) board/stm32f401rc-rs485: Add support to Device Configuration over Telnet
+* [#12737](https://github.com/apache/nuttx/pull/12737) board/stm32f401rc-rs485: Add support to MAX7219 8x8 LED Matrix
+* [#13516](https://github.com/apache/nuttx/pull/13516) boards: Update EXAMPLES_SOTEST_DEVMINOR to EXAMPLES_SOTEST_DEVMINOR_MAX
+* [#12743](https://github.com/apache/nuttx/pull/12743) boards/arm/rp2040: Userled configuration to Seeed-Stdio RP2040
+* [#13142](https://github.com/apache/nuttx/pull/13142) boards/arm/stm32/stm32f4discovery: Add support to RFID MFRC522
+* [#13440](https://github.com/apache/nuttx/pull/13440) boards/arm/stm32h7/stm32h745i-disco: Add RPTUN support
+* [#12825](https://github.com/apache/nuttx/pull/12825) boards/armv5: Make ARMv5 boards work again
+* [#12593](https://github.com/apache/nuttx/pull/12593) boards/stm32: DRV8825 driver
+* [#12673](https://github.com/apache/nuttx/pull/12673) boards/esp32[c3|c6|h2|s2|s3]: Ignore etctmp in common board
+* [#13124](https://github.com/apache/nuttx/pull/13124) boards/esp32s3_lan9250: deinitialize the ethernet device lan9250
+* [#12716](https://github.com/apache/nuttx/pull/12716) boards/esp32s3: Increse the default stack size for usbnsh
+* [#12763](https://github.com/apache/nuttx/pull/12763) boards/imx93-evk: add sdimage cleanup
+* [#12876](https://github.com/apache/nuttx/pull/12876) boards/lm3s6965-ek: fix memory.ld for PROTECTED
+* [#12598](https://github.com/apache/nuttx/pull/12598) boards/MIMXRT1020-EVK: Fix board I2C code to adapt to last IMXRT I2C/pi…
+* [#13137](https://github.com/apache/nuttx/pull/13137) boards/risc-v/esp32c6/esp32c6-devkitm: Add support to RFID MFRC522
+* [#12869](https://github.com/apache/nuttx/pull/12869) boards/rv-virt: unify RV32 config names
+* [#13226](https://github.com/apache/nuttx/pull/13226) boards/sim: Defconfigs for nand and mnemofs
+* [#12898](https://github.com/apache/nuttx/pull/12898) boards/xtensa/esp32s3: ESP32S3 Emmc Support
+* [#13478](https://github.com/apache/nuttx/pull/13478) boardctl: add board control api to start slave core
+* [#13273](https://github.com/apache/nuttx/pull/13273) boardcrtl: change BOARDCTL_TESTSET to BOARDIOC_SPINLOCK
+* [#12747](https://github.com/apache/nuttx/pull/12747) Change nucleof429zi nsh defconfig
+* [#13059](https://github.com/apache/nuttx/pull/13059) defconfig: add SYSTEM_TELNETD related config
+* [#13334](https://github.com/apache/nuttx/pull/13334) esp32: fix a way to test a config
+* [#13563](https://github.com/apache/nuttx/pull/13563) esp32s3: Fix faulty `esp32s3-devkit:stack` example
+* [#13234](https://github.com/apache/nuttx/pull/13234) imx9_usdhc.c: Fix build error when CONFIG_ARM64_DCACHE_DISABLE=y
+* [#12867](https://github.com/apache/nuttx/pull/12867) LTDC for Linum board
+* [#12780](https://github.com/apache/nuttx/pull/12780) nrf9160-dk: disable FPU for modem example
+* [#13476](https://github.com/apache/nuttx/pull/13476) nucleo-h745zi: fix potential bl jump to app failed issue
+* [#13069](https://github.com/apache/nuttx/pull/13069) nucleo-l432kc: Revert the USART2 config to be use by virtual COM port
+* [#12987](https://github.com/apache/nuttx/pull/12987) nuttx/boards:Uniform initialization format for init_array.
+* [#13208](https://github.com/apache/nuttx/pull/13208) risc-v/bl808: Configure MMU to cache User Text, Data and Heap
+* [#13199](https://github.com/apache/nuttx/pull/13199) risc-v/mmu: Configure T-Head MMU to cache User Text, Data and Heap
+* [#12862](https://github.com/apache/nuttx/pull/12862) risc-v/qemu-rv: Add Build Config for leds64_rust
+* [#13186](https://github.com/apache/nuttx/pull/13186) risc-v/qemu-rv: Add Build Config for leds64_zig
+* [#12896](https://github.com/apache/nuttx/pull/12896) risc-v/qemu-rv: add cluster PLIC/CLINT configs
+* [#12544](https://github.com/apache/nuttx/pull/12544) riscv/nuttsbi: add MTVAL argument
+* [#12645](https://github.com/apache/nuttx/pull/12645) stm32h7/linum-stm32h753bi: add support to qencoder
+* [#12739](https://github.com/apache/nuttx/pull/12739) stm32f777zit6-meadow: Add support for two USB CDC/ACM
+* [#12637](https://github.com/apache/nuttx/pull/12637) Usbnsh to seed-xiao-rp2040 board
+* [#12713](https://github.com/apache/nuttx/pull/12713) zynq_mpsoc/zcu111: add support for gpio and board auto led
+* [#12806](https://github.com/apache/nuttx/pull/12806) zynq-mpsoc/zcu111: independent JTAG configs from normal nsh configs
+* [#12797](https://github.com/apache/nuttx/pull/12797) w25c: add W25_DEBUG sub-menu config option and update debug traces.
+File System
+New FS
+* [#13001](https://github.com/apache/nuttx/pull/13001) V9FS For NuttX
+FS Improvements
+* [#13514](https://github.com/apache/nuttx/pull/13514) add sched note for littlefs/romfs/rpmsgfs
+* [#12863](https://github.com/apache/nuttx/pull/12863) Fix the location of tmpfs pwrite write and Fixed some code check warnings
+* [#13500](https://github.com/apache/nuttx/pull/13500) fs.h: fix a comment in file_operations
+* [#12532](https://github.com/apache/nuttx/pull/12532) fs: add backtrace to where file opens
+* [#13150](https://github.com/apache/nuttx/pull/13150) fs: add fs_heap, support shm/tmpfs/pseudofile with indepent heap
+* [#12587](https://github.com/apache/nuttx/pull/12587) Fs: backtrace tweak
+* [#13512](https://github.com/apache/nuttx/pull/13512) fs: Dump the list of files when the file description runs out
+* [#13194](https://github.com/apache/nuttx/pull/13194) fs: nfs: Fix nfsmount error
+* [#12978](https://github.com/apache/nuttx/pull/12978) fs: Rename node with inode.
+* [#12969](https://github.com/apache/nuttx/pull/12969) Fslock optimize
+* [#12937](https://github.com/apache/nuttx/pull/12937) fs/mnemofs: Fix journal log rw issue, rw size issue
+* [#12945](https://github.com/apache/nuttx/pull/12945) fs/hostfs: Replace strcpy with memcpy
+* [#13443](https://github.com/apache/nuttx/pull/13443) fs_inode:Change the type of i_crefs to atomic_int
+* [#13458](https://github.com/apache/nuttx/pull/13458) fs_dup2 bug fix, memleak
+* [#13573](https://github.com/apache/nuttx/pull/13573) fs/chmod/fchmod/lchmod: only set permissions by mode_t and ignore othjer bits
+* [#12931](https://github.com/apache/nuttx/pull/12931) fs/epoll: Optimize implementation details
+* [#12615](https://github.com/apache/nuttx/pull/12615) fs/fat: Fix Fseek Bug When File Size Is Multiple of Cluster Size
+* [#12548](https://github.com/apache/nuttx/pull/12548) fs/fat/fs_fat32.c Return EOF when reading past the end of the file.
+* [#13521](https://github.com/apache/nuttx/pull/13521) fs/dump: correct SCHED_DUMP_ON_EXIT to DUMP_ON_EXIT
+* [#12990](https://github.com/apache/nuttx/pull/12990) fs/mmap: Fix build warning with [-Wmaybe-uninitialized].
+* [#13132](https://github.com/apache/nuttx/pull/13132) fs/procfs: Supports any number of thread displays
+* [#13123](https://github.com/apache/nuttx/pull/13123) fs/shmfs:Avoid an integer overflow
+* [#12790](https://github.com/apache/nuttx/pull/12790) fs/spiffs: Return OK on `spiffs_fstat` success
+* [#13407](https://github.com/apache/nuttx/pull/13407) fs/mmap: Add MADV_HUGEPAGE definitions
+* [#13406](https://github.com/apache/nuttx/pull/13406) fs/mmap: Ensure anonymous pages are initialized to zero
+* [#12661](https://github.com/apache/nuttx/pull/12661) fs/mnemofs: Adds Block Allocator
+* [#12668](https://github.com/apache/nuttx/pull/12668) fs/mnemofs: Add parent iterator and path methods.
+* [#12680](https://github.com/apache/nuttx/pull/12680) fs/mnemofs: Add LRU and CTZ methods
+* [#12683](https://github.com/apache/nuttx/pull/12683) fs/mnemofs: Add journal methods.
+* [#12702](https://github.com/apache/nuttx/pull/12702) fs/mnemofs: Add master node and r/w methods
+* [#12943](https://github.com/apache/nuttx/pull/12943) fs/mnemofs: Autoformat
+* [#12808](https://github.com/apache/nuttx/pull/12808) fs/mnemofs: Refactoring path logic, direntry size bug fix, open free bug fix
+* [#12658](https://github.com/apache/nuttx/pull/12658) fs/mnemofs: Setup and VFS methods
+* [#13475](https://github.com/apache/nuttx/pull/13475) fs/mount: add ftl proxy to mount block filesystem on mtd device
+* [#13258](https://github.com/apache/nuttx/pull/13258) fs/mq_open: revise comments
+* [#13326](https://github.com/apache/nuttx/pull/13326) fs/files_extend: Bug Fix
+* [#13331](https://github.com/apache/nuttx/pull/13331) fs/inode: using inode reference to indicate unlink and simply code
+* [#13077](https://github.com/apache/nuttx/pull/13077) Fsnotify
+* [#12942](https://github.com/apache/nuttx/pull/12942) Hostfs support get filepath by ioctl
+* [#12817](https://github.com/apache/nuttx/pull/12817) procfs/meminfo: free delaylist  before reporting
+* [#13058](https://github.com/apache/nuttx/pull/13058) procfs/mempool: fix did not remove when pool not enabled
+* [#13092](https://github.com/apache/nuttx/pull/13092) rpmsgfs: fix out of bounds access caused by data transmission farmat
+* [#13063](https://github.com/apache/nuttx/pull/13063) rpmsgfs: set fs type to rpmsgfs when mount through rpmsgfs
+* [#13348](https://github.com/apache/nuttx/pull/13348) smartfs procfs: fix double declare g_smartfs_operations
+* [#12939](https://github.com/apache/nuttx/pull/12939) rpmsgfs_client:Fix error return exception
+* [#12941](https://github.com/apache/nuttx/pull/12941) rpmsgfs: support filelock
+* [#13098](https://github.com/apache/nuttx/pull/13098) tmpfs: old data was loaded when SEEK_SET beyond end of the file
+* [#13490](https://github.com/apache/nuttx/pull/13490) vfs:fix a type mismatch issue and a typo
+Networking
+Improvements
+* [#13385](https://github.com/apache/nuttx/pull/13385) Fix the bug that netlink receive wait does not hang up
+* [#13053](https://github.com/apache/nuttx/pull/13053) icmp:add net_lock to protect icmp connection
+* [#13336](https://github.com/apache/nuttx/pull/13336) local_socket: add SO_SNDBUF & SO_RCVBUF support
+* [#13045](https://github.com/apache/nuttx/pull/13045) localsocket improvment
+* [#12639](https://github.com/apache/nuttx/pull/12639) net: Enable ICMP by default if IPv4 is enabled
+* [#13028](https://github.com/apache/nuttx/pull/13028) net_chksum.c:mod process of generating sum to solve checksum error
+* [#12991](https://github.com/apache/nuttx/pull/12991) net/icmpv6/icmpv6_input.c: fix undefined build error
+* [#13093](https://github.com/apache/nuttx/pull/13093) net/netdev: Add periodic log for netdev statistics
+* [#12689](https://github.com/apache/nuttx/pull/12689) net/netfilter: fix windows compile error
+* [#12688](https://github.com/apache/nuttx/pull/12688) net/pkt: correct PF_PACKET family sending errors
+* [#12995](https://github.com/apache/nuttx/pull/12995) net/pkt: fix issue that set nonblock by fcntl does not take effect
+* [#13010](https://github.com/apache/nuttx/pull/13010) net/pkt: fix raw socket send data length is insufficient
+* [#13120](https://github.com/apache/nuttx/pull/13120) net/tcp_timer: fix tcp_timer idle loop and retransmission bug
+* [#13051](https://github.com/apache/nuttx/pull/13051) net/tcp: reset the dupack counter.
+* [#12899](https://github.com/apache/nuttx/pull/12899) net/tun: Remove unused variables in read & write
+* [#13191](https://github.com/apache/nuttx/pull/13191) net/tun: Support changing carrier state of TUN/TAP
+* [#13350](https://github.com/apache/nuttx/pull/13350) net/udp: Fixed the issue of sending ICMP error when the destination address is broadcast/multicast.
+* [#13037](https://github.com/apache/nuttx/pull/13037) netdev_upperhalf: add polling mode support for tx/rx
+* [#13046](https://github.com/apache/nuttx/pull/13046) netdev/ioctl: Setting log level to warning on SIOCGIFHWADDR failure
+* [#13007](https://github.com/apache/nuttx/pull/13007) netdev/lower: Add reclaim callback and use it in virtio-net
+* [#13343](https://github.com/apache/nuttx/pull/13343) netdev/statistics: Add bytes for netdev statistics
+* [#13008](https://github.com/apache/nuttx/pull/13008) netdev/upper: Delay replied packets to prevent TX quota become negated
+* [#12992](https://github.com/apache/nuttx/pull/12992) netinet/in.h: add macro definitions to resolve compilation errors
+* [#12994](https://github.com/apache/nuttx/pull/12994) netlib/route: add length for add/del route-func to reduce caller stack usage
+* [#13335](https://github.com/apache/nuttx/pull/13335) netdb: Make NETDB_DNSSERVER_NAMESERVERS effective for NETDB_RESOLVCONF
+* [#13038](https://github.com/apache/nuttx/pull/13038) netdb: netdb code support ffmpeg rtsp(getaddrinfo & getnameinfo)
+* [#13049](https://github.com/apache/nuttx/pull/13049) Modify the IPV6 address acquisition method and the gateway settings.
+* [#13125](https://github.com/apache/nuttx/pull/13125) modify for offload checksum and add macro with tcp/icmp/icmpv6/igmp checksum
+* [#13026](https://github.com/apache/nuttx/pull/13026) modify the type of the ipv6 parameters to solve runtime error
+* [#13029](https://github.com/apache/nuttx/pull/13029) solve Problem of tcp parameter calculation exceeding the boundary
+* [#13156](https://github.com/apache/nuttx/pull/13156) sys/socket: implement compiler agnostic sockaddr_storage alignment
+* [#13158](https://github.com/apache/nuttx/pull/13158) tcp_close.c:when tcp socket stays in TCP_FIN_WAIT_1 or TCP_FIN_WAIT_2,calling tcp_close_eventhandler releases received packets
+* [#12999](https://github.com/apache/nuttx/pull/12999) tcp_input: if tcp->req > recvreq, send ack only when state is TCP_ESTABLISHED
+
+Unsorted
+Improvements
+* [#13448](https://github.com/apache/nuttx/pull/13448) [Bug-Fix] Resource leaks
+* [#13100](https://github.com/apache/nuttx/pull/13100) [BugFix]Command "critmon" error
+* [#13002](https://github.com/apache/nuttx/pull/13002) 12K sample rate support
+* [#13486](https://github.com/apache/nuttx/pull/13486) Accelerate access to interrupt status
+* [#12980](https://github.com/apache/nuttx/pull/12980) add fb_vsync_pollnotify
+* [#12959](https://github.com/apache/nuttx/pull/12959) Add goldfish events
+* [#12951](https://github.com/apache/nuttx/pull/12951) Add irq disable func
+* [#13130](https://github.com/apache/nuttx/pull/13130) Add memory pressure monitoring
+* [#13089](https://github.com/apache/nuttx/pull/13089) api:add lib_realpath function
+* [#12947](https://github.com/apache/nuttx/pull/12947) assert: add compile_assert macro
+* [#13020](https://github.com/apache/nuttx/pull/13020) assert: check COMPILE_TIME_ASSERT before define
+* [#13087](https://github.com/apache/nuttx/pull/13087) Audio upstream
+* [#13044](https://github.com/apache/nuttx/pull/13044) Basic Atomic for NuttX
+* [#13099](https://github.com/apache/nuttx/pull/13099) bch: alloc bch->buffer when offset not aligned
+* [#13513](https://github.com/apache/nuttx/pull/13513) BCH: Add readonly configuration for BCH devices
+* [#12853](https://github.com/apache/nuttx/pull/12853) binfmt/elf_loadfile: Set sh_addr even if SHF_ALLOC == 0
+* [#12965](https://github.com/apache/nuttx/pull/12965) boot: fix potential bl jump to app failed issue
+* [#13094](https://github.com/apache/nuttx/pull/13094) Bugfix hcreate
+* [#13300](https://github.com/apache/nuttx/pull/13300) can: Before we use pstate, we should check if it is NULL.
+* [#13570](https://github.com/apache/nuttx/pull/13570) can: Add g_ prefix to can_dlc_to_len and len_to_can_dlc.
+* [#13048](https://github.com/apache/nuttx/pull/13048) can: CAN code optimization
+* [#12656](https://github.com/apache/nuttx/pull/12656) can: fixes and tweaks for CAN FD support
+* [#13126](https://github.com/apache/nuttx/pull/13126) Capture adds the function of edges counting
+* [#12934](https://github.com/apache/nuttx/pull/12934) clk: fix reg operation not compatible with 64bit
+* [#13210](https://github.com/apache/nuttx/pull/13210) cdcacm: align cdcacm_epconfigure function parameters
+* [#13189](https://github.com/apache/nuttx/pull/13189) Controlling rgb led bp
+* [#12889](https://github.com/apache/nuttx/pull/12889) Coredump enhancement, optimized prompt statements
+* [#13474](https://github.com/apache/nuttx/pull/13474) coredump: just save latest core file
+* [#12958](https://github.com/apache/nuttx/pull/12958) coredump: refine coredump info analyse
+* [#13066](https://github.com/apache/nuttx/pull/13066) crypto: import the ability to clone session
+* [#13109](https://github.com/apache/nuttx/pull/13109) crypto/bn: Provide software algorithms to calculate inverse elements and greatest common divisor
+* [#13431](https://github.com/apache/nuttx/pull/13431) crypto/rsa: add exp mod in software crypto
+* [#12970](https://github.com/apache/nuttx/pull/12970) Disable clean/flush optimization in case of SMP restriction
+* [#12777](https://github.com/apache/nuttx/pull/12777) dlfcn: Add stub for dladdr
+* [#12779](https://github.com/apache/nuttx/pull/12779) dlfcn: Fix indent issue in lib_dlclose.c
+* [#13159](https://github.com/apache/nuttx/pull/13159) dynamically create work queues
+* [#13489](https://github.com/apache/nuttx/pull/13489) enable O_CLOEXEC explicitly to avoid fd leak
+* [#13118](https://github.com/apache/nuttx/pull/13118) Enhance ASSERT
+* [#13424](https://github.com/apache/nuttx/pull/13424) Enhance Kasan
+* [#13559](https://github.com/apache/nuttx/pull/13559) Enhance Kasan's global variable out of bounds detection
+* [#13388](https://github.com/apache/nuttx/pull/13388) Expose IPTOS_xxx to the application layer
+* [#12963](https://github.com/apache/nuttx/pull/12963) fdcheck: fix race condition in fdcheck
+* [#13096](https://github.com/apache/nuttx/pull/13096) fb:add select overlay FB_NO_OVERLAY
+* [#13296](https://github.com/apache/nuttx/pull/13296) filep Reference count
+* [#12578](https://github.com/apache/nuttx/pull/12578) Fix allocated memory test
+* [#13461](https://github.com/apache/nuttx/pull/13461) Fix dev_mem related
+* [#13555](https://github.com/apache/nuttx/pull/13555) Fix greater-than-or-equal-to-zero issue
+* [#12741](https://github.com/apache/nuttx/pull/12741) Fix pin LTDC_B0, should be PJ12 instead of PF0
+* [#13129](https://github.com/apache/nuttx/pull/13129) Fix task_setup race condition
+* [#13054](https://github.com/apache/nuttx/pull/13054) Fix the compilation warnings
+* [#12955](https://github.com/apache/nuttx/pull/12955) fix the potential bug of putwc, fgetwc, ungetwc, wcsstr, fputwc
+* [#13095](https://github.com/apache/nuttx/pull/13095) fix:uart_rpmsg_dmareceive
+* [#13477](https://github.com/apache/nuttx/pull/13477) ftl: should pre-allocate eblock for car case
+* [#13000](https://github.com/apache/nuttx/pull/13000) getrlimit: implement RLIMIT_STACK return limit stack size
+* [#13459](https://github.com/apache/nuttx/pull/13459) GNSS: Add support for constellation, measurement, clock and geofence
+* [#13504](https://github.com/apache/nuttx/pull/13504) goldfish:add kernel mode support
+* [#13330](https://github.com/apache/nuttx/pull/13330) group/filelist: add reference to protect filelist of group
+* [#13554](https://github.com/apache/nuttx/pull/13554) i2c: Optimize access to private data
+* [#13233](https://github.com/apache/nuttx/pull/13233) Increase the chance for _assert to work early in the boot
+* [#13306](https://github.com/apache/nuttx/pull/13306) init: add OSINIT_TASK_READY
+* [#13228](https://github.com/apache/nuttx/pull/13228) inline restore_critical_section and add parameters to restore_critical_section
+* [#12981](https://github.com/apache/nuttx/pull/12981) input: fix goldfish input and lvgl input device name mismatch problem
+* [#13108](https://github.com/apache/nuttx/pull/13108) input: fix touchevent race condition
+* [#13073](https://github.com/apache/nuttx/pull/13073) inode: call inode_release when close success
+* [#13198](https://github.com/apache/nuttx/pull/13198) Introduce new PCI framework
+* [#13442](https://github.com/apache/nuttx/pull/13442) input/ff: modify FF_MAX to support 64-bit machine
+* [#13387](https://github.com/apache/nuttx/pull/13387) ipfrag: fix warnig
+* [#13163](https://github.com/apache/nuttx/pull/13163) ipfrag: remove assert for actual product reasons
+* [#13012](https://github.com/apache/nuttx/pull/13012) irq: add [enter|leave]_critical_section_nonirq
+* [#13018](https://github.com/apache/nuttx/pull/13018) irq: add isr thread
+* [#13242](https://github.com/apache/nuttx/pull/13242) irq: dynaminc create g_irqmap
+* [#13256](https://github.com/apache/nuttx/pull/13256) irq: irq with the same priority share the same wqueue
+* [#12595](https://github.com/apache/nuttx/pull/12595) irq: remove g_cpu_nestcount in restore_critical_section
+* [#12935](https://github.com/apache/nuttx/pull/12935) irq: remove restore_critical_section in irq
+* [#12596](https://github.com/apache/nuttx/pull/12596) irq: remove restore_critical_section in irq
+* [#13369](https://github.com/apache/nuttx/pull/13369) irq: simplify code by using OSINIT_TASK_READY
+* [#13119](https://github.com/apache/nuttx/pull/13119) Kasan enhance
+* [#12893](https://github.com/apache/nuttx/pull/12893) kasan:fix bug write error is recognized as read error
+* [#13133](https://github.com/apache/nuttx/pull/13133) Keep the log level consistent with assert
+* [#12590](https://github.com/apache/nuttx/pull/12590) libmetal/atomic: enable 64-bit atomic by toolchain builtin flags
+* [#13543](https://github.com/apache/nuttx/pull/13543) lilygo_tbeam_lora_gps/gps: Enable GNSSUTILS_MINMEA_LIB for EXAMPLES_GPS
+* [#13549](https://github.com/apache/nuttx/pull/13549) lzf:Add macro judgment to header file reference.
+* [#12929](https://github.com/apache/nuttx/pull/12929) make/disassembly: generate disassembly file
+* [#13179](https://github.com/apache/nuttx/pull/13179) memset:optimizate speed.
+* [#12985](https://github.com/apache/nuttx/pull/12985) minidumpserver: fix parsing bug
+* [#13287](https://github.com/apache/nuttx/pull/13287) mksymtab.c support for structure
+* [#13452](https://github.com/apache/nuttx/pull/13452) modify BUILD_LOADABLE to MODULES which backwards-compatible Kernel
+* [#12968](https://github.com/apache/nuttx/pull/12968) MPU update
+* [#13460](https://github.com/apache/nuttx/pull/13460) New Rpmsg Transports: Rpmsg Port SPI, Rpmsg Port Uart and Rpmsg Router Transport Support
+* [#13104](https://github.com/apache/nuttx/pull/13104) nxmutex api enhance
+* [#13047](https://github.com/apache/nuttx/pull/13047) nuttx-names.in:add popen & pclose assign to glibc interface
+* [#13006](https://github.com/apache/nuttx/pull/13006) nuttx/audio: add AUDIOIOC_GETPOSITION ioctl
+* [#13005](https://github.com/apache/nuttx/pull/13005) nuttx/audio: add offload buffer size config
+* [#13340](https://github.com/apache/nuttx/pull/13340) nuttx/crypto: export asymmetric algorithms about ecdh and ecc256 via /dev/crypto
+* [#13138](https://github.com/apache/nuttx/pull/13138) nuttx/crypto: fix wrong implementation in crypto module
+* [#13173](https://github.com/apache/nuttx/pull/13173) nuttx/crypto: support new algorithm about crc32 and aes-cmac
+* [#13084](https://github.com/apache/nuttx/pull/13084) nuttx/crypto: support poly1305 and ripemd160 algorithm
+* [#12986](https://github.com/apache/nuttx/pull/12986) nuttx/note: fix missing the last character when printing custom labels.
+* [#12730](https://github.com/apache/nuttx/pull/12730) NVS: fix align size
+* [#13187](https://github.com/apache/nuttx/pull/13187) nvs: modify nvs block size and block numbers
+* [#12601](https://github.com/apache/nuttx/pull/12601) queue: inline queue
+* [#13435](https://github.com/apache/nuttx/pull/13435) pci/pci_uio_ivshmem: pci uio ivshmem msix interrupt support
+* [#13178](https://github.com/apache/nuttx/pull/13178) pl031:change mktime to timegm.
+* [#13057](https://github.com/apache/nuttx/pull/13057) pm_runtime: fix missing header
+* [#13064](https://github.com/apache/nuttx/pull/13064) pm_activity: fix deadlock with spinlock and critcal_section
+* [#13055](https://github.com/apache/nuttx/pull/13055) pm: add pm_idle, up_idle only handle pm state execution
+* [#12933](https://github.com/apache/nuttx/pull/12933) pm: add debug_assert for cb register/unregister api
+* [#13072](https://github.com/apache/nuttx/pull/13072) pm: update document, add pm_idle interface for not-smp case
+* [#13279](https://github.com/apache/nuttx/pull/13279) poll: fix thread_cancel() caused poll used after free
+* [#13074](https://github.com/apache/nuttx/pull/13074) Private requirement for wapi
+* [#13168](https://github.com/apache/nuttx/pull/13168) protected build: userspace threads will unexpectly work in privileged mode after syscall
+* [#13153](https://github.com/apache/nuttx/pull/13153) pty: use mutex to protect alloc minor
+* [#13295](https://github.com/apache/nuttx/pull/13295) psram_cache_init: remove cosmetic differences between PRO/APP
+* [#13438](https://github.com/apache/nuttx/pull/13438) ramlog bug fix
+* [#13283](https://github.com/apache/nuttx/pull/13283) Refactor wdog module
+* [#12891](https://github.com/apache/nuttx/pull/12891) Reimplemented the mempool traversal function and fixed some existing bugs in the mempool
+* [#13463](https://github.com/apache/nuttx/pull/13463) rename, strtoul & sscanf
+* [#13309](https://github.com/apache/nuttx/pull/13309) Restore ASSERT/VERIFY semantics
+* [#13485](https://github.com/apache/nuttx/pull/13485) Revert "irq: add [enter|leave]_critical_section_nonirq"
+* [#12607](https://github.com/apache/nuttx/pull/12607) Revert "irq: remove restore_critical_section in irq"
+* [#13432](https://github.com/apache/nuttx/pull/13432) Rpmsg VirtIO Transport support and releated patches
+* [#13183](https://github.com/apache/nuttx/pull/13183) rpmsg_rtc:Update g_basetime from rpmsg.
+* [#13169](https://github.com/apache/nuttx/pull/13169) rpmsg.c: move onceinit judge logic to common part
+* [#13404](https://github.com/apache/nuttx/pull/13404) rpmsgblk: split multi_cmd only when it is too large to be placed into…
+* [#13465](https://github.com/apache/nuttx/pull/13465) rpmsgdev: Support server export and oneway polling
+* [#13172](https://github.com/apache/nuttx/pull/13172) rptun.c: fix rptun.c format follow rpmsg virtio
+* [#13203](https://github.com/apache/nuttx/pull/13203) rtc alarm:fix doesn't call nxsig_notification
+* [#13515](https://github.com/apache/nuttx/pull/13515) shm: remove useless macro
+* [#13280](https://github.com/apache/nuttx/pull/13280) smp: smp call handler add up_cpu_paused_[save|restore]
+* [#13405](https://github.com/apache/nuttx/pull/13405) spi_slave: change length to nwords
+* [#12599](https://github.com/apache/nuttx/pull/12599) spin_lock: inline spin_lock
+* [#12837](https://github.com/apache/nuttx/pull/12837) spinlock: add support of spin_trylock_irqsave()
+* [#12836](https://github.com/apache/nuttx/pull/12836) spinlock: inline no trace implement to remove duplicate logic
+* [#13272](https://github.com/apache/nuttx/pull/13272) spinlock: spin_initialize should add memory barrier
+* [#13457](https://github.com/apache/nuttx/pull/13457) stack recored bug fix
+* [#13386](https://github.com/apache/nuttx/pull/13386) stream/syslograw: remove support for iob buffer in syslog
+* [#13511](https://github.com/apache/nuttx/pull/13511) Support msync
+* [#13196](https://github.com/apache/nuttx/pull/13196) support rss/arfs with device
+* [#13106](https://github.com/apache/nuttx/pull/13106) suppress libasan checks
+* [#13031](https://github.com/apache/nuttx/pull/13031) Synchronize the modification of the WiFi problems in QEMU.
+* [#13113](https://github.com/apache/nuttx/pull/13113) Swift embedded support
+* [#12820](https://github.com/apache/nuttx/pull/12820) task_fork.c: Fix vfork for BUILD_KERNEL
+* [#12754](https://github.com/apache/nuttx/pull/12754) up_backtrace: fix maybe backtrace the exiting thread
+* [#13293](https://github.com/apache/nuttx/pull/13293) Update clock speed
+* [#13410](https://github.com/apache/nuttx/pull/13410) Update posix timer
+* [#12611](https://github.com/apache/nuttx/pull/12611) Upgrade Segger SystemView to V3.54
+* [#12705](https://github.com/apache/nuttx/pull/12705) V4l2m2m openh264 x264 to builtin
+* [#13030](https://github.com/apache/nuttx/pull/13030) video/fb: changed circbuf_write assert to warning
+* [#13433](https://github.com/apache/nuttx/pull/13433) VirtIO PCI Transport Support for NuttX
+* [#13338](https://github.com/apache/nuttx/pull/13338) virtio-blk: support called read/write in interrupt
+* [#13437](https://github.com/apache/nuttx/pull/13437) wqueue bug fix
+* [#13241](https://github.com/apache/nuttx/pull/13241) wqueue: add interface work_queue_priority_wq and work_queue_priority
--- a/Documentation/ReleaseNotes/NuttX-12.8.0
+++ b/Documentation/ReleaseNotes/NuttX-12.8.0
@ -0,0 +1,930 @@
+NuttX-12.8.0
+------------
+
+What's New In This Release
+Major Changes to Core OS
+Sched
+* [#14080](https://github.com/apache/nuttx/pull/14080) Revert "sched/group/setuptask_file: duplicate idle task fd for kernelthreads
+* [#14190](https://github.com/apache/nuttx/pull/14190) Revert "sched/spinlock: remove nesting spinlock support"
+* [#14804](https://github.com/apache/nuttx/pull/14804) Revert "sem: change sem wait to atomic operation"
+* [#14497](https://github.com/apache/nuttx/pull/14497) Revert "shced:sem: replace mutex with spinlock"
+* [#14203](https://github.com/apache/nuttx/pull/14203) Reapply "sched/spinlock: remove nesting spinlock support"
+* [#14761](https://github.com/apache/nuttx/pull/14761) Reapply "SYSLOG_DEFAULT: wrap up_putc/up_nputs calls with critical section" with a fix
+* [#13950](https://github.com/apache/nuttx/pull/13950) sched note enhance
+* [#13901](https://github.com/apache/nuttx/pull/13901) Sched note wdog
+* [#14164](https://github.com/apache/nuttx/pull/14164) sched_backtrace: fix when dump running thread in other-core
+* [#14875](https://github.com/apache/nuttx/pull/14875) sched_unlock: remove redundant/stale logic and comment
+* [#14631](https://github.com/apache/nuttx/pull/14631) sched: add header irq.h to exit.c
+* [#14183](https://github.com/apache/nuttx/pull/14183) sched: delete the dump file list when the thread exits
+* [#13962](https://github.com/apache/nuttx/pull/13962) sched: export sched_getcpu API in AMP mode
+* [#14243](https://github.com/apache/nuttx/pull/14243) sched: fix nxsched_process_delivered did not call hook
+* [#14083](https://github.com/apache/nuttx/pull/14083) sched: fix nxsched_suspend_scheduler regression
+* [#14026](https://github.com/apache/nuttx/pull/14026) sched: fix omitted merging the pending queue regression
+* [#14059](https://github.com/apache/nuttx/pull/14059) sched: inline nxsched_select_cpu nxsched_add_prioritized 
+* [#14272](https://github.com/apache/nuttx/pull/14272) sched: modify CONFIG_DUMP_ON_EXIT to CONFIG_SCHED_DUMP_ON_EXIT
+* [#14286](https://github.com/apache/nuttx/pull/14286) sched: remove duplicate functions
+* [#13995](https://github.com/apache/nuttx/pull/13995) sched: remove param in nxsched_remove_readytorun
+* [#14954](https://github.com/apache/nuttx/pull/14954) sched: replace up_cpu_index with this_cpu
+* [#14051](https://github.com/apache/nuttx/pull/14051) sched: support backtrace record
+* [#14048](https://github.com/apache/nuttx/pull/14048) sched: There is no need to use sched_[un]lock
+* [#14340](https://github.com/apache/nuttx/pull/14340) sched: Use spinlock repalce sched_[un]lock in some place
+* [#14863](https://github.com/apache/nuttx/pull/14863) sched/addrenv.c: Fix usage of atomic_fetch_sub
+* [#14061](https://github.com/apache/nuttx/pull/14061) sched/cpuload: fix SMP situation CPULOAD statistics are inaccurate
+* [#14504](https://github.com/apache/nuttx/pull/14504) sched/cpuload: move g_cpuload_wdog to private chapter
+* [#14069](https://github.com/apache/nuttx/pull/14069) sched/group: clear tcb group after group_release
+* [#13957](https://github.com/apache/nuttx/pull/13957) sched/group: There is no need to use sched_[un]lock
+* [#14186](https://github.com/apache/nuttx/pull/14186) sched/instrument: rename stack_record.c to stack_monitor.c
+* [#14941](https://github.com/apache/nuttx/pull/14941) sched/lockcount: replace all lockcount check to nxsched_islocked_tcb()
+* [#14815](https://github.com/apache/nuttx/pull/14815) sched/misc/assert.c: don't compile dump_assert_info logic if CONFIG_DEBUG_ALERT=n
+* [#14614](https://github.com/apache/nuttx/pull/14614) sched/misc/assert.c: don't compile dump_task logic if CONFIG_DEBUG_ALERT=n
+* [#14191](https://github.com/apache/nuttx/pull/14191) sched/pthread: Remove unused pthread_sem_xxx functions
+* [#14032](https://github.com/apache/nuttx/pull/14032) sched/pthread: save pid before task activate
+* [#14089](https://github.com/apache/nuttx/pull/14089) sched/pthread: There is no need to use sched_[un]lock
+* [#14627](https://github.com/apache/nuttx/pull/14627) sched/sched: change the judgment condition for nxsched_set_affinity
+* [#13896](https://github.com/apache/nuttx/pull/13896) sched/signal: change pthread_exit to nx_pthread_exit
+* [#13934](https://github.com/apache/nuttx/pull/13934) sched/signal: Fix compilation errors for MSVC.
+* [#14079](https://github.com/apache/nuttx/pull/14079) sched/spinlock: remove nesting spinlock support
+* [#14454](https://github.com/apache/nuttx/pull/14454) sched/task_exit.c: Refresh current CPU instead of relying on stale value
+* [#14402](https://github.com/apache/nuttx/pull/14402) sched/timer: Simplify setitimer implementation.
+* [#14013](https://github.com/apache/nuttx/pull/14013) sched/wdog: Fix code style
+* [#14003](https://github.com/apache/nuttx/pull/14003) sched/wdog: Revert wd_cancel semantics
+* [#14629](https://github.com/apache/nuttx/pull/14629) sched/wqueue: fix work_notifier_setup() false failure
+* [#14569](https://github.com/apache/nuttx/pull/14569) nuttx/semaphore: Move define CONFIG_SEM_PREALLOCHOLDERS to include/semaphore.h
+* [#14129](https://github.com/apache/nuttx/pull/14129) nuttx/syscall: export nxsem_getprioceiling and nxsem_setprioceiling v…
+* [#14581](https://github.com/apache/nuttx/pull/14581) pthread_cond remove csection  and sched_lock
+* [#14786](https://github.com/apache/nuttx/pull/14786) pthread_cond_broadcast use wait_count for judement
+* [#14626](https://github.com/apache/nuttx/pull/14626) pthread: remove enter_critical_section in pthread_barrier_wait
+* [#14161](https://github.com/apache/nuttx/pull/14161) pthread: We should not directly include arch/spinlock.h
+MM
+* [#14314](https://github.com/apache/nuttx/pull/14314) Revert "mm/iob: Replace the critical section with spin lock"
+* [#14370](https://github.com/apache/nuttx/pull/14370) `mempool` backtrace fix and de-init fix
+* [#15060](https://github.com/apache/nuttx/pull/15060) mm_grantable.c: Fix infinite loop due to memory fragmentation
+* [#14572](https://github.com/apache/nuttx/pull/14572) mm: Complete remaining unused macros instead of memory to fill tags
+* [#14588](https://github.com/apache/nuttx/pull/14588) mm: fix tlsf compiler error
+* [#13893](https://github.com/apache/nuttx/pull/13893) mm: Resolve a series of issues caused by opening the software tag kasan
+* [#14858](https://github.com/apache/nuttx/pull/14858) mm/gran: Speed optimize gran_match
+* [#13849](https://github.com/apache/nuttx/pull/13849) mm/heap: hold heap lock before access mm_nregions
+* [#14054](https://github.com/apache/nuttx/pull/14054) mm/heap: memory alignment before executing kasan_register
+* [#14764](https://github.com/apache/nuttx/pull/14764) mm/iob: remove csection
+* [#14506](https://github.com/apache/nuttx/pull/14506) mm/kasan: extern kasan API only MM_KASAN is enabled
+* [#14294](https://github.com/apache/nuttx/pull/14294) mm/Kconfig: adjust config options order and fix typos
+* [#14105](https://github.com/apache/nuttx/pull/14105) mm/Kconfig: fix build error when MM_BACKTRACE > 0 and disable mempool
+* [#14091](https://github.com/apache/nuttx/pull/14091) mm/kconfig: Remove unnecessary dependencies
+* [#13891](https://github.com/apache/nuttx/pull/13891) mm/kconfig: set the default alignment of global variable out-of-bounds detection is 1
+* [#14575](https://github.com/apache/nuttx/pull/14575) mm/mm_gran: fix compile warnings
+* [#14144](https://github.com/apache/nuttx/pull/14144) mm/mm_heap: Optimizing heap performance changing the mm_size2ndx and…
+* [#14547](https://github.com/apache/nuttx/pull/14547) mm/mm_memalign: add debugging log
+* [#14114](https://github.com/apache/nuttx/pull/14114) mm/sw_tags: add config for no longer checking for tags 0
+Libc
+* [#14218](https://github.com/apache/nuttx/pull/14218) Revert "libc/atomic: decoupling atomic and spinlock to avoid recursion"
+* [#14313](https://github.com/apache/nuttx/pull/14313) Revert "libs/libc:Openlibm adds exp10 and exp10f function implementat…
+* [#14153](https://github.com/apache/nuttx/pull/14153) lib_memoryregion: fix the comments about the memory flags
+* [#14799](https://github.com/apache/nuttx/pull/14799) lib_pathbuffer: change nxmutex -> spinlock
+* [#14316](https://github.com/apache/nuttx/pull/14316) lib_stdoutstream:need return write size
+* [#14148](https://github.com/apache/nuttx/pull/14148) lib_uuid_create: try use hardware random number generators first
+* [#14292](https://github.com/apache/nuttx/pull/14292) lib/stdatomic: include stddef.h in atomic.h
+* [#14661](https://github.com/apache/nuttx/pull/14661) libbuiltin: Simplify makefile writing
+* [#14782](https://github.com/apache/nuttx/pull/14782) libbuiltin/kconfig: Modify coverage function dependencies
+* [#14679](https://github.com/apache/nuttx/pull/14679) libbuiltin/Makefile: Modify the libbuiltin makefile to standard
+* [#14715](https://github.com/apache/nuttx/pull/14715) libbuitin/compiler_rt: Supports separate builtin rt.builtins or rt.profile
+* [#14451](https://github.com/apache/nuttx/pull/14451) libc string:Separate code.
+* [#13969](https://github.com/apache/nuttx/pull/13969) libc: add CRC-8-ROHC support
+* [#14296](https://github.com/apache/nuttx/pull/14296) libc: Add debug assert to prevent tls allocation failure
+* [#14523](https://github.com/apache/nuttx/pull/14523) libc: Fix lib_arc4random.c:111:(.text.arc4random_buf+0x26): undefined reference to `clock_systime_ticks'
+* [#14388](https://github.com/apache/nuttx/pull/14388) libc: Fix typo in libc/string/Kconfig.
+* [#14365](https://github.com/apache/nuttx/pull/14365) libc: Make getcwd() work even CONFIG_DISABLE_ENVIRON is enabled
+* [#14509](https://github.com/apache/nuttx/pull/14509) libc: Refine the arc4random_buf implementation
+* [#14198](https://github.com/apache/nuttx/pull/14198) libc/atomic: decoupling atomic and spinlock to avoid recursion
+* [#14057](https://github.com/apache/nuttx/pull/14057) libc/lib_utsname: Store version number for debugging and preventing optimization
+* [#14753](https://github.com/apache/nuttx/pull/14753) libc/libc.csv: Fix signature of getpass
+* [#14050](https://github.com/apache/nuttx/pull/14050) libc/machine: Fix the error caused by tag kasan
+* [#14605](https://github.com/apache/nuttx/pull/14605) libc/machine/CMakeLists: should alaways build arch_atomic.c
+* [#14798](https://github.com/apache/nuttx/pull/14798) libc/misc: do not sanitize backtrace_format
+* [#14297](https://github.com/apache/nuttx/pull/14297) libc/modlib: Make modlib selectable from defconfig
+* [#14154](https://github.com/apache/nuttx/pull/14154) libc/newlib:Declaration of adding depth
+* [#15000](https://github.com/apache/nuttx/pull/15000) libc/puts: newline was omitted for empty string
+* [#14589](https://github.com/apache/nuttx/pull/14589) libc/unistd: fixed tasking build issue
+* [#14459](https://github.com/apache/nuttx/pull/14459) libcxx: fix compile error
+* [#14431](https://github.com/apache/nuttx/pull/14431) libcxx: Ignore compile warnings.
+* [#14244](https://github.com/apache/nuttx/pull/14244) libcxx: optional localization.
+* [#15017](https://github.com/apache/nuttx/pull/15017) libcxx/CMakeLists.txt: Remove unnecessary flags.
+* [#15057](https://github.com/apache/nuttx/pull/15057) libcxxabi: Soft link the libcxxabi header file to nuttx/include
+* [#14884](https://github.com/apache/nuttx/pull/14884) libcxxmini: Add missing runtime related classes.
+* [#15036](https://github.com/apache/nuttx/pull/15036) libm: Do not link the toolchain's libm unless explicitly selected
+* [#15037](https://github.com/apache/nuttx/pull/15037) libm: Do not link the toolchain's libm unless explicitly selected [2]
+* [#14783](https://github.com/apache/nuttx/pull/14783) libm: fix typo caused compile failed
+* [#15022](https://github.com/apache/nuttx/pull/15022) libm/newlib: Add arch-specific source code first to CSRCS
+* [#14101](https://github.com/apache/nuttx/pull/14101) libm/newlib: remove -Wno-maybe-uninitialized
+* [#14838](https://github.com/apache/nuttx/pull/14838) libs: add gcov framework support
+* [#14291](https://github.com/apache/nuttx/pull/14291) libs: remove lib_libbsprintf automatic line wrapping
+* [#14570](https://github.com/apache/nuttx/pull/14570) libs/arch_libc:Add kasan protection for memset and other mm api
+* [#14136](https://github.com/apache/nuttx/pull/14136) libs/libc: Optimize the stack space of lib_vsprintf by splitting argl…
+* [#14142](https://github.com/apache/nuttx/pull/14142) libs/libc:Openlibm adds exp10 and exp10f function implementations
+* [#13961](https://github.com/apache/nuttx/pull/13961) libs/libc/fdt/Make.defs: cannot move due to directory not empty bugfix
+* [#14559](https://github.com/apache/nuttx/pull/14559) libs/libc/obstack: fix allocated chunk overrun due to invalid limit
+* [#14328](https://github.com/apache/nuttx/pull/14328) libs/libxx: uClibc depends on CONFIG_ALLOW_GPL_COMPONENTS=y
+* [#14284](https://github.com/apache/nuttx/pull/14284) libs/misc/memoryregion: remove unused memory_region
+* [#14600](https://github.com/apache/nuttx/pull/14600) libs/modlib: Load data using `up_textheap_data_address`
+* [#14364](https://github.com/apache/nuttx/pull/14364) libs/modlib.c: Set VMA for empty and unallocated sections
+* [#14705](https://github.com/apache/nuttx/pull/14705) libs/uClibc++: Fix the Download URL for uClibc++
+* [#14706](https://github.com/apache/nuttx/pull/14706) libs/uClibc++: Fix the Download URL for uClibc++ (CMake)
+* [#13988](https://github.com/apache/nuttx/pull/13988) libs/x86_64:Add the setjmp/longjmp function
+* [#14145](https://github.com/apache/nuttx/pull/14145) libs/xxx/CMakeLists.txt: add cmake compile support
+* [#14668](https://github.com/apache/nuttx/pull/14668) libxx: All cxx libraries move down one level
+* [#14471](https://github.com/apache/nuttx/pull/14471) libxx: C++ low level library select LIBSUPCXX by default.
+* [#14250](https://github.com/apache/nuttx/pull/14250) libxx: Globally reference the header file of libcxxabi.
+* [#14586](https://github.com/apache/nuttx/pull/14586) libxx/patch: Remove jira information and change-id 
+* [#14238](https://github.com/apache/nuttx/pull/14238) nuttx/libc:Add _dl_find_object and dl_iterate_phdr function.
+* [#14085](https://github.com/apache/nuttx/pull/14085) nuttx/libcxxtest: Fix build error.
+Tools
+* [#13959](https://github.com/apache/nuttx/pull/13959) [bugfix]checkpatch.sh:Fix checking for wrong cmake files
+* [#13958](https://github.com/apache/nuttx/pull/13958) [bugfix]tools/mkdeps.c:add options for gen full path object target
+* [#14723](https://github.com/apache/nuttx/pull/14723) [darwin] CI macos-14 : updated toolchains for macOS Apple Silicon
+* [#14892](https://github.com/apache/nuttx/pull/14892) [MSYS2] CMake+Ninja Fix arm-none-eabi-ar: Argument list too long
+* [#14539](https://github.com/apache/nuttx/pull/14539) toolchain/tasking: fix build break on tasking toolchain
+* [#14620](https://github.com/apache/nuttx/pull/14620) toolchains: Compiler versioning adds --print-memory-usage
+* [#14387](https://github.com/apache/nuttx/pull/14387) tools: fix parsetrace.py output
+* [#14046](https://github.com/apache/nuttx/pull/14046) tools: gcov.sh supports generating device-side code coverage
+* [#14289](https://github.com/apache/nuttx/pull/14289) tools: Rename apps-or-nuttx-Make.defs to Make.defs
+* [#14399](https://github.com/apache/nuttx/pull/14399) tools/checkpatch: fix isort doesn't return error
+* [#14691](https://github.com/apache/nuttx/pull/14691) tools/ci/platforms/darwin.sh: Port NuttX CI Job to macOS-14
+* [#14121](https://github.com/apache/nuttx/pull/14121) tools/configure.sh: add relative path
+* [#14438](https://github.com/apache/nuttx/pull/14438) tools/esp32s3/Config.mk: fix "printf:`\': invalid format character"
+* [#14393](https://github.com/apache/nuttx/pull/14393) tools/esp32s3/Config.mk: fix "unterminated call to function" error
+* [#14267](https://github.com/apache/nuttx/pull/14267) tools/espressif: add esptool version check to Espressif build system
+* [#14933](https://github.com/apache/nuttx/pull/14933) tools/gdb: Add a singleton class for macros
+* [#14902](https://github.com/apache/nuttx/pull/14902) tools/imx9: Add norimage support to bootloader
+* [#14565](https://github.com/apache/nuttx/pull/14565) tools/mkdeps: increase MAX_BUFFER from 16384 to 65536
+* [#14709](https://github.com/apache/nuttx/pull/14709) tools/rp2040: Building picotool if necessary
+* [#14147](https://github.com/apache/nuttx/pull/14147) tools/showsize.sh: support pass custom nuttx executable
+* [#14047](https://github.com/apache/nuttx/pull/14047) tools/Unix.mk: allow defconfig to overwrite old config
+Various
+* [#13919](https://github.com/apache/nuttx/pull/13919) OpenAMP Upgrade Part1: prepare for the OpenAMP Upgrade
+* [#14155](https://github.com/apache/nuttx/pull/14155) openamp/libmetal: use config OPENAMP_CACHE to control lib metal cache…
+* [#14843](https://github.com/apache/nuttx/pull/14843) GDB Plugin Upgrade Part1 - Thread related commands
+* [#14851](https://github.com/apache/nuttx/pull/14851) GDB Plugin Upgrade part2: memory leak detection and other memory tools
+* [#14854](https://github.com/apache/nuttx/pull/14854) GDB Plugin Upgrade part3: fs related tools
+* [#14899](https://github.com/apache/nuttx/pull/14899) GDB Plugin Upgrade part4: net related tools
+* [#14920](https://github.com/apache/nuttx/pull/14920) gdb/debug: add debugpy to debug python code
+* [#14315](https://github.com/apache/nuttx/pull/14315) gdbserver.py optimization
+* [#14486](https://github.com/apache/nuttx/pull/14486) gdbstub:remove ARCH_HAVE_DEBUG depends
+* [#14789](https://github.com/apache/nuttx/pull/14789) gdbstub:typo fix
+* [#13903](https://github.com/apache/nuttx/pull/13903) gdbstub:we can use uart to debug with gdb when crash
+* [#14309](https://github.com/apache/nuttx/pull/14309) include: queue.h: Make flink clear after sq_rem
+* [#14536](https://github.com/apache/nuttx/pull/14536) include/netinet/if_ether.h: add ethhdr definition
+* [#14193](https://github.com/apache/nuttx/pull/14193) include/nuttx/arch.h: MSI alloc API should be always available
+* [#15015](https://github.com/apache/nuttx/pull/15015) include/usbdev_trace: Fix argument number and return value of macro `usbtrace_enumerate()`
+* [#14187](https://github.com/apache/nuttx/pull/14187) nuttx:move "#define STRINGIFY(x)" to nuttx/macro.h
+* [#14537](https://github.com/apache/nuttx/pull/14537) nuttx/atomic.h:Add use condition for using stdatomic.h
+* [#14233](https://github.com/apache/nuttx/pull/14233) nuttx/elf.h: Fix build error with unknown type name 'bool'.
+* [#14665](https://github.com/apache/nuttx/pull/14665) nuttx/uorb.h: Add GNSS firmware version for `struct sensor_gnss`
+* [#14913](https://github.com/apache/nuttx/pull/14913) nuttxgdb list function enhancement
+* [#14916](https://github.com/apache/nuttx/pull/14916) nuttxgdb memory commands performance optimization
+* [#15001](https://github.com/apache/nuttx/pull/15001) nuttxgdb minor fix
+* [#14914](https://github.com/apache/nuttx/pull/14914) nuttxgdb net module update
+* [#14912](https://github.com/apache/nuttx/pull/14912) nuttxgdb utils module update
+* [#14915](https://github.com/apache/nuttx/pull/14915) nuttxgdb utils value update
+* [#14919](https://github.com/apache/nuttx/pull/14919) nuttxgdb: add error hint to gdbinit
+* [#14921](https://github.com/apache/nuttx/pull/14921) nuttxgdb: minor fix to diagnose command and thread module
+* [#14976](https://github.com/apache/nuttx/pull/14976) nuttxgdb/rpmsg.py:dump rpmsg_service message
+* [#14347](https://github.com/apache/nuttx/pull/14347) coredump bug fix
+* [#14262](https://github.com/apache/nuttx/pull/14262) coredump: add architecture-specific registers dump including NVIC an…
+* [#14485](https://github.com/apache/nuttx/pull/14485) coredump: coredump_add_memory_region need use flags
+* [#14150](https://github.com/apache/nuttx/pull/14150) coredump: do not dump non-writeable memory segment
+* [#14254](https://github.com/apache/nuttx/pull/14254) coredump: fix bug that memsegs got invalid value
+* [#14295](https://github.com/apache/nuttx/pull/14295) coredump.c: del multiple behavior
+* [#14553](https://github.com/apache/nuttx/pull/14553) coredump.py:bug fix python file not have rename
+Build System
+Improvements
+* [#15053](https://github.com/apache/nuttx/pull/15053) kasan/globals: fix compile error
+* [#15056](https://github.com/apache/nuttx/pull/15056) kasan/lto: Turn off lto by default anyway
+* [#14327](https://github.com/apache/nuttx/pull/14327) clang: support gcov ARM LLVM clang supports code coverage detection
+* [#14472](https://github.com/apache/nuttx/pull/14472) clang:libclang_rt.builtins-xxx.a supports builtin
+* [#14637](https://github.com/apache/nuttx/pull/14637) clang/cmake: Fix clang cmake can't find libgcc align with makefile
+* [#14877](https://github.com/apache/nuttx/pull/14877) Clang/gcov: Enhance clang gcov dump
+* [#14544](https://github.com/apache/nuttx/pull/14544) clang/ld.lld: clang17's ld.lld and above support the option --print-memory-usage
+* [#14095](https://github.com/apache/nuttx/pull/14095) common/Toolchain.defs: support CONFIG_DEBUG_NOOPT for x86_64
+* [#14127](https://github.com/apache/nuttx/pull/14127) common/Toolchain.defs: support CONFIG_DEBUG_NOOPT for x86_64
+* [#14123](https://github.com/apache/nuttx/pull/14123) Compile warning fix & header file adjust
+* [#15032](https://github.com/apache/nuttx/pull/15032) gcc/gcov: Add instrumentation function
+* [#14970](https://github.com/apache/nuttx/pull/14970) gcov: Add gcov gcc implementation and toolchain to ci compilation
+* [#14890](https://github.com/apache/nuttx/pull/14890) gcov: Add toolchain gcov dependency option
+* [#14946](https://github.com/apache/nuttx/pull/14946) gcov: Add usage documentation
+* [#14538](https://github.com/apache/nuttx/pull/14538) gcov: Fix typographical errors
+* [#14557](https://github.com/apache/nuttx/pull/14557) gcov: Support for the most streamlined profile of LLVM-embedded-toolchain-for-Arm
+* [#13965](https://github.com/apache/nuttx/pull/13965) gcov:adjust gcov configuration name and delete non-existent dependencie
+* [#14251](https://github.com/apache/nuttx/pull/14251) cmake: add newly added sources to cmake
+* [#14615](https://github.com/apache/nuttx/pull/14615) cmake: don't include syslog files if CONFIG_SYSLOG=n
+* [#14404](https://github.com/apache/nuttx/pull/14404) cmake: fix the fdiagnostics-color handle issue
+* [#14401](https://github.com/apache/nuttx/pull/14401) cmake: Renamed savedefconfig with refreshsilent
+* [#14756](https://github.com/apache/nuttx/pull/14756) cmake:bugfix kconfig menu in cmake cannot be generated recursively
+* [#14592](https://github.com/apache/nuttx/pull/14592) cmake:implement CMake build of xtensa arch
+* [#14576](https://github.com/apache/nuttx/pull/14576) cmake(bugfix): add host mkdeps&incdir tool CMake build and fix X86_64 compile error
+* [#14206](https://github.com/apache/nuttx/pull/14206) cmake(bugfix):add dependencies for nuttx_post ensure time order
+* [#14746](https://github.com/apache/nuttx/pull/14746) cmake(bugfix):add missing source file for driver/serial and keep romfs cmake intermediate 
+* [#14607](https://github.com/apache/nuttx/pull/14607) cmake(bugfix):add xtensa libc machine function build
+* [#14210](https://github.com/apache/nuttx/pull/14210) cmake(bugfix):disable proxy and service source in open-amp
+* [#15064](https://github.com/apache/nuttx/pull/15064) cmake(bugfix):fix CMake build break on MacOS
+* [#14703](https://github.com/apache/nuttx/pull/14703) cmake(bugfix):fix directory not being successfully added when adding romfs
+* [#14780](https://github.com/apache/nuttx/pull/14780) cmake(bugfix):fix libcxx build error cause by layout changed
+* [#14427](https://github.com/apache/nuttx/pull/14427) cmake(bugfix):Fixed the issue that the host toolchain version cannot be specified
+* [#14624](https://github.com/apache/nuttx/pull/14624) cmake(bugfix):make sure the extra_lib only added once
+* [#14757](https://github.com/apache/nuttx/pull/14757) cmake(bugfix):remove no need target_link_library in static target
+* [#13971](https://github.com/apache/nuttx/pull/13971) cmake(bugfix):Synchronize the compilation differences between CMake and Makefile in nuttx repo
+* [#14612](https://github.com/apache/nuttx/pull/14612) cmake(build):add the specified armclang compiler to the cmake  Toolchain file
+* [#14265](https://github.com/apache/nuttx/pull/14265) cmake(clear warning):toolchain file do not need set parent scope
+* [#14747](https://github.com/apache/nuttx/pull/14747) cmake(enhance):add NuttX CMake extensions module
+* [#14907](https://github.com/apache/nuttx/pull/14907) cmake(enhance):enhance NuttX cmake target_dependencies and link_library modules
+* [#15009](https://github.com/apache/nuttx/pull/15009) cmake(enhance):Enhance romfs so that RAWS files can be added in any location
+* [#13955](https://github.com/apache/nuttx/pull/13955) cmake(Enhancement):enhance compile options for custom toolchainimplement the REVERSE opt of `add_compile_options()`
+* [#14175](https://github.com/apache/nuttx/pull/14175) cmake(refine):fix cmake options typo and add EXTRA_FLAGS support
+* [#13890](https://github.com/apache/nuttx/pull/13890) Cmake/kasan:  cmake supports multiple link global variables out of bounds
+* [#14540](https://github.com/apache/nuttx/pull/14540) CMake/preprocess: fix typo PREPROCES -> PREPROCESS
+Architectural Support
+New Architecture Support
+* [#14599](https://github.com/apache/nuttx/pull/14599) Adding STM32H5 arch files
+* [#14831](https://github.com/apache/nuttx/pull/14831) Raspberry Pico 2 porting
+Architecture Improvements
+* [#13876](https://github.com/apache/nuttx/pull/13876) arch/irq: add the up_getusrpc macro to get the PC of the interrupted …
+* [#14491](https://github.com/apache/nuttx/pull/14491) arch/Kconfig: remove ARCH_MATH_H if LIBCXX
+* [#13967](https://github.com/apache/nuttx/pull/13967) arch/libc: Integrate vfork into fork and vfork directly call up_fork
+* [#14058](https://github.com/apache/nuttx/pull/14058) arch/perf: modify the return value of up_perf_gettime to clock_t
+* [#14779](https://github.com/apache/nuttx/pull/14779) arch/toolchain: Add toolchain gcc
+* [#14170](https://github.com/apache/nuttx/pull/14170) Revert "nuttx/arch:Enabling ARCH_MATH_H is required when compiling sim with the 13.2 version of the toolchain"
+* [#14803](https://github.com/apache/nuttx/pull/14803) arch_atomic : Introduce CONFIG_LIBC_ARCH_ATOMIC
+* [#14827](https://github.com/apache/nuttx/pull/14827) arch_atomic: support nx atomic function
+* [#14880](https://github.com/apache/nuttx/pull/14880) arch_atomic: use small lock in libs/libc/machine/arch_atomic.c
+* [#14312](https://github.com/apache/nuttx/pull/14312) select ARM_HAVE_MVE and ARCH_HAVE_FPU for mps platform
+ARM
+* [#14221](https://github.com/apache/nuttx/pull/14221) Arm qemu
+* [#14107](https://github.com/apache/nuttx/pull/14107) arm_gicv2_dump: optimize gic dump
+* [#14434](https://github.com/apache/nuttx/pull/14434) arm: fix dataabort on qemu-armv7a:knsh
+* [#14865](https://github.com/apache/nuttx/pull/14865) arm: remove up_set_current_regs/up_current_regs
+* [#14134](https://github.com/apache/nuttx/pull/14134) arm/armv8-r: add implements of arm_get_mpid()
+* [#14498](https://github.com/apache/nuttx/pull/14498) arm/armv8-r: fix unable to switch context in ISR context
+* [#14496](https://github.com/apache/nuttx/pull/14496) arm/armv8-r: init HSCTLR and HACTLR for EL2
+* [#14502](https://github.com/apache/nuttx/pull/14502) arm/armv8-r: optimize generic timer initialization
+* [#14474](https://github.com/apache/nuttx/pull/14474) arm/build: suppress LOAD RWX linker warning
+* [#14173](https://github.com/apache/nuttx/pull/14173) arm/cmake: fix cmake compile error
+* [#14363](https://github.com/apache/nuttx/pull/14363) arm/cxd56: use chip specific vectors to allow smpcall update regs
+* [#14846](https://github.com/apache/nuttx/pull/14846) arm/efm32: fix regression by PR#14810
+* [#14503](https://github.com/apache/nuttx/pull/14503) arm/gicv3: replace this_cpu() to up_cpu_index()
+* [#14219](https://github.com/apache/nuttx/pull/14219) arm/goldfish: add memory map for DDR region
+* [#14959](https://github.com/apache/nuttx/pull/14959) arm/isr: move up_set_interrupt_context() to chip define
+* [#14748](https://github.com/apache/nuttx/pull/14748) arm/olimex-stm32-p407: Fix kmodule board profile
+* [#14712](https://github.com/apache/nuttx/pull/14712) arm/phy6222: Fix the garbled Linker Script
+* [#14277](https://github.com/apache/nuttx/pull/14277) arm/riscv: remove redundant judgment
+* [#14750](https://github.com/apache/nuttx/pull/14750) arm/rp2040: Add support for Waveshare RP2040 Zero board
+* [#14197](https://github.com/apache/nuttx/pull/14197) arm/stm32f401rc-rs485: Add support to WS2812 addressable LED
+* [#14887](https://github.com/apache/nuttx/pull/14887) armv6-m: fix the incorrect stub-function entry address of svc call
+* [#14307](https://github.com/apache/nuttx/pull/14307) armv7-a:adjust gdb register order
+* [#15058](https://github.com/apache/nuttx/pull/15058) armv7-a/armv7-r/armv8-r: percpu reg store this_task
+* [#14301](https://github.com/apache/nuttx/pull/14301) armv8-m: set fpscr when do exception_direct
+* [#14360](https://github.com/apache/nuttx/pull/14360) armv8-r/cp15: fix the problem of op1 operand confusion in ICC_SGI1R
+* [#14160](https://github.com/apache/nuttx/pull/14160) armv8-r/gicv3: disable 64bits access gic 64bits registers
+* [#14929](https://github.com/apache/nuttx/pull/14929) armv8-r/gicv3: support fiq
+* [#14928](https://github.com/apache/nuttx/pull/14928) armv8-r/libc: optimize libc string apis with asm
+* [#14495](https://github.com/apache/nuttx/pull/14495) armv8m/clang.cmake: add armv8m clang config
+* [#13877](https://github.com/apache/nuttx/pull/13877) arch: fix the sched parameter update when exiting
+* [#14135](https://github.com/apache/nuttx/pull/14135) arch: set current regs firstly in undefinedinsn
+* [#13886](https://github.com/apache/nuttx/pull/13886) arch: support customized up_cpu_index() in AMP mode
+* [#14881](https://github.com/apache/nuttx/pull/14881) arch/arm: syscall SYS_switch_context and SYS_restore_context use 0 para
+* [#14264](https://github.com/apache/nuttx/pull/14264) arch/armv7:fix a typo
+* [#13861](https://github.com/apache/nuttx/pull/13861) arch: cxd56xx: Add SD card 4-bit capability
+* [#14847](https://github.com/apache/nuttx/pull/14847) arch: cxd56xx: Fix compile error of cxd56_gnss.c
+* [#14842](https://github.com/apache/nuttx/pull/14842) arch: cxd56xx: Fix cxd56xx for SMP
+* [#14993](https://github.com/apache/nuttx/pull/14993) arch: cxd56xx: use small lock in arch/arm/src/cxd56xx/cxd56_clock.c
+* [#15031](https://github.com/apache/nuttx/pull/15031) arch: cxd56xx: use small lock in arch/arm/src/cxd56xx/cxd56_nxaudio_src.c
+* [#15033](https://github.com/apache/nuttx/pull/15033) rp23xx: use small lock in arch/arm/src/rp23xx/rp23xx_usbdev.c
+* [#15062](https://github.com/apache/nuttx/pull/15062) s32k1xx_serial: arch/arm/src/s32k1xx/s32k1xx_serial.c
+* [#14795](https://github.com/apache/nuttx/pull/14795) arch/arm/src/samv7/sam_afec.c: AFEC1 actually has 12 physical inputs
+* [#14436](https://github.com/apache/nuttx/pull/14436) sam_sfc.c incorrect EFUSEIOC name used
+* [#14322](https://github.com/apache/nuttx/pull/14322) SAMA5 fix compiler warning in sam_adc.c
+* [#14128](https://github.com/apache/nuttx/pull/14128) SAMA5D2. Fix DEBUGASSERT triggered in sam_updhs.c
+* [#15013](https://github.com/apache/nuttx/pull/15013) samv7: fix bytes to words calculation in user signature read
+* [#14425](https://github.com/apache/nuttx/pull/14425) samv7: fix QSPI build
+* [#14512](https://github.com/apache/nuttx/pull/14512) arch/arm/stm32: convert error to warning when CCM is not enabled
+* [#13870](https://github.com/apache/nuttx/pull/13870) arch/arm/stm32{|f7}/socketcan: fix debugassert for extid frames
+* [#14527](https://github.com/apache/nuttx/pull/14527) arch/arm/stm32/Kconfig: fix Kconfig error
+* [#14534](https://github.com/apache/nuttx/pull/14534) arch/arm/stm32/stm32_dumpgpio.c: fix print warnings
+* [#14768](https://github.com/apache/nuttx/pull/14768) arch/stm32h5: Add ADC hardware register file
+* [#14860](https://github.com/apache/nuttx/pull/14860) arch/stm32h5: add basic ADC support
+* [#14692](https://github.com/apache/nuttx/pull/14692) arch/stm32h5: Add ethernet hardware support files
+* [#14883](https://github.com/apache/nuttx/pull/14883) arch/stm32h5: Add timer register hardware file
+* [#14676](https://github.com/apache/nuttx/pull/14676) arch/stm32h5: H5 add ethernet options to Kconfig
+* [#14813](https://github.com/apache/nuttx/pull/14813) arch/stm32h5: Simplify PLL configuration.
+* [#14336](https://github.com/apache/nuttx/pull/14336) STM32G4 Flash Driver
+* [#14769](https://github.com/apache/nuttx/pull/14769) STM32H5 I2C Driver
+* [#14675](https://github.com/apache/nuttx/pull/14675) STM32H5 RCC Fixes
+* [#15021](https://github.com/apache/nuttx/pull/15021) Add STM32H5 FDCAN Hardware File
+* [#14515](https://github.com/apache/nuttx/pull/14515) arch/arm/stm32h7: add workaround for Renode
+* [#14995](https://github.com/apache/nuttx/pull/14995) imxrt_serial: use small lock in arch/arm/src/imxrt/imxrt_serial.c
+ARM64
+* [#14770](https://github.com/apache/nuttx/pull/14770) Add arm64 support for gdbserver.py tool
+* [#13978](https://github.com/apache/nuttx/pull/13978) Arm64 arch
+* [#14280](https://github.com/apache/nuttx/pull/14280) Arm64 board
+* [#13985](https://github.com/apache/nuttx/pull/13985) ARM64 bug fix
+* [#14074](https://github.com/apache/nuttx/pull/14074) ARM64 CONTEXT REGS number is 36
+* [#14940](https://github.com/apache/nuttx/pull/14940) arm64: change name saved_reg to saved_regs
+* [#14991](https://github.com/apache/nuttx/pull/14991) arm64: change some format
+* [#14829](https://github.com/apache/nuttx/pull/14829) arm64: fix compile failed 'tpidr_el1' undeclared
+* [#14628](https://github.com/apache/nuttx/pull/14628) arm64: fix compile failed when build ELF apps
+* [#14476](https://github.com/apache/nuttx/pull/14476) arm64: fix fvp smp faild to boot
+* [#14171](https://github.com/apache/nuttx/pull/14171) arm64: fix the cmake break in kernel mode
+* [#14980](https://github.com/apache/nuttx/pull/14980) arm64: remove g_running_tasks[this_cpu()] = NULL
+* [#14824](https://github.com/apache/nuttx/pull/14824) arm64: remove unused code
+* [#14905](https://github.com/apache/nuttx/pull/14905) arm64: remove up_set_current_regs/up_current_regs
+* [#14911](https://github.com/apache/nuttx/pull/14911) arm64: syscall SYS_switch_context and SYS_restore_context use 0 para
+* [#15026](https://github.com/apache/nuttx/pull/15026) arm64/imx8: fix build break
+* [#14787](https://github.com/apache/nuttx/pull/14787) arm64/imx9: add imx93-evk ddr training
+* [#15054](https://github.com/apache/nuttx/pull/15054) arm64/lto: Fix link error after opening lto
+* [#14771](https://github.com/apache/nuttx/pull/14771) arm64/mcount.c: Add to nuttx compilation
+* [#14978](https://github.com/apache/nuttx/pull/14978) arm64/mte: Add support for arm64 mte
+* [#15029](https://github.com/apache/nuttx/pull/15029) arm64/qemu: Add 9pfs configuration
+* [#14983](https://github.com/apache/nuttx/pull/14983) arm64/toolchain: Cmake alignment makefile writing
+* [#15052](https://github.com/apache/nuttx/pull/15052) arm64/toolchain: Fix toolchain judgment after opening lto
+* [#14470](https://github.com/apache/nuttx/pull/14470) arm64/toolchains:Add the following kasan compilation options
+* [#14455](https://github.com/apache/nuttx/pull/14455) arhc/arm64: vector table may be far away form arm64_fatal_handle
+* [#14648](https://github.com/apache/nuttx/pull/14648) arch/arm64: add have fork config
+* [#14235](https://github.com/apache/nuttx/pull/14235) arch/arm64: add support to config SPI interrupt affinity routing to CPU0 by default
+* [#14730](https://github.com/apache/nuttx/pull/14730) arch/arm64: bug fixarm64_fatal_handler need regs parms
+* [#14247](https://github.com/apache/nuttx/pull/14247) arch/arm64: fix build warnings
+* [#14689](https://github.com/apache/nuttx/pull/14689) arch/arm64: Optimized SGI to avoid VM exit.
+* [#14381](https://github.com/apache/nuttx/pull/14381) arch/arm64: Remove arm64_copystate.c
+* [#14242](https://github.com/apache/nuttx/pull/14242) arch/arm64: remove struct regs_context
+* [#14063](https://github.com/apache/nuttx/pull/14063) arch/arm64: rename register names to align with arm32
+* [#14739](https://github.com/apache/nuttx/pull/14739) arch/arm64: syscall SYS_switch_context and SYS_restore_context use tcb as parm
+* [#14986](https://github.com/apache/nuttx/pull/14986) arch/arm64/imx9: Boot move mmu init to correct place
+* [#14972](https://github.com/apache/nuttx/pull/14972) arch/arm64/imx9: Clear DMA channel interrupts on init
+* [#14653](https://github.com/apache/nuttx/pull/14653) arch/arm64/imx9: Clear edma4 mux conf before set
+* [#14868](https://github.com/apache/nuttx/pull/14868) arch/arm64/imx9: Fix cntrfrq_el0 to correct value
+* [#14688](https://github.com/apache/nuttx/pull/14688) arch/arm64/imx9: Reset rx fifo in mode change
+* [#14973](https://github.com/apache/nuttx/pull/14973) arch/arm64/imx9/imx9_flexspi: Replace memcpy by while loop
+* [#14864](https://github.com/apache/nuttx/pull/14864) arch/arm64/imx9/lspi: improve spi initialization
+* [#14671](https://github.com/apache/nuttx/pull/14671) arch/arm64/src/common/arm64_fatal.c: Fix compilation warning with -We…
+* [#14577](https://github.com/apache/nuttx/pull/14577) arch/arm64/src/imx9/imx9_lpuart.c: Fix parity get in TCGETS
+* [#14306](https://github.com/apache/nuttx/pull/14306) imx8qm-mek: Resolve boot issue for non-EL3 environments
+* [#14684](https://github.com/apache/nuttx/pull/14684) Imx9 flexspi updates
+* [#14870](https://github.com/apache/nuttx/pull/14870) Imx9 lpi2c fixes
+* [#14478](https://github.com/apache/nuttx/pull/14478) Imx9 lpspi fixes
+* [#14545](https://github.com/apache/nuttx/pull/14545) Imx9 uart cleanups and flow control
+* [#14685](https://github.com/apache/nuttx/pull/14685) imx9/flexcan: Add disable/enable cycle
+* [#14373](https://github.com/apache/nuttx/pull/14373) imx9/flexcan: Make self reception disable to be configurable
+RISC_V
+* [#14741](https://github.com/apache/nuttx/pull/14741) arch/risc-v: Add ARCH_HAVE_RAMFUNCS option for ESP32-C3
+* [#14878](https://github.com/apache/nuttx/pull/14878) arch/risc-v: Minor document improvement
+* [#14961](https://github.com/apache/nuttx/pull/14961) arch/risc-v/src/cmake/Toolchain.cmake: Msys2 CMake fixed nuttx/config.h: No such file or directory
+* [#14841](https://github.com/apache/nuttx/pull/14841) arch/risc-v/src/mpfs/mpfs_irq.c: Default global interrupt priorities
+* [#14329](https://github.com/apache/nuttx/pull/14329) arch/riscv: Add cpuid mapping (hartid↔cpuid)
+* [#14994](https://github.com/apache/nuttx/pull/14994) MPFS boot enhancements
+* [#14345](https://github.com/apache/nuttx/pull/14345) mpfs/opnsbi: refine config for for insufficient envm capacity
+* [#14561](https://github.com/apache/nuttx/pull/14561) mpfs/smp: Add riscv_macros to mpfs_shead
+* [#14326](https://github.com/apache/nuttx/pull/14326) mps/bringup: Add initialization of tmpfs
+* [#14530](https://github.com/apache/nuttx/pull/14530) mps/clang: Add a defconfig for mps to support clang compilation
+* [#14143](https://github.com/apache/nuttx/pull/14143) mps/cmake: add cmake build
+* [#14305](https://github.com/apache/nuttx/pull/14305) mps2-an500: add missing source file
+* [#14270](https://github.com/apache/nuttx/pull/14270) mps2-an521: remove the unnecessary -pipe build options
+* [#14776](https://github.com/apache/nuttx/pull/14776) mps3-an547:ap: Disable cmd_wait() as it depends on procfs currently
+* [#14398](https://github.com/apache/nuttx/pull/14398) ricv/riscv_cpuid: Return meaningful values for CPU/Hart ID when SMP=no
+* [#14754](https://github.com/apache/nuttx/pull/14754) risc-v and xtensa Kconfig : Remove LIBC_ARCH_ATOMIC
+* [#14984](https://github.com/apache/nuttx/pull/14984) risc-v: remove g_running_tasks[this_cpu()] = NULL
+* [#14064](https://github.com/apache/nuttx/pull/14064) risc-v:Unify module compilation options
+* [#14432](https://github.com/apache/nuttx/pull/14432) risc-v/esp32: Fixed path of File-system mount point 
+* [#14563](https://github.com/apache/nuttx/pull/14563) risc-v/esp32c3: linker script fix for mcuboot and wifi usage 
+* [#14020](https://github.com/apache/nuttx/pull/14020) risc-v/espressif: Fix alert message in `esp_setup_irq()`
+* [#14201](https://github.com/apache/nuttx/pull/14201) risc-v/mpfs: enable DEFAULT_SMALL for insufficient envm capacity
+* [#14857](https://github.com/apache/nuttx/pull/14857) risc-v/up_testset: Implement test-and-set with AMOSWAP
+* [#14384](https://github.com/apache/nuttx/pull/14384) riscv_cpuindex.c: Fix usage of CONFIG_ARCH_RV_HARTID_BASE
+* [#14379](https://github.com/apache/nuttx/pull/14379) riscv_cpustart.c: Fix reading of interrupt status
+* [#14700](https://github.com/apache/nuttx/pull/14700) riscv_syscall.S: Fix a massive bug in syscall dispatch logic
+* [#14962](https://github.com/apache/nuttx/pull/14962) riscv: remove up_set_current_regs/up_current_regs
+* [#15030](https://github.com/apache/nuttx/pull/15030) riscv: Some judgments are missing
+* [#14724](https://github.com/apache/nuttx/pull/14724) riscv: Suppress LOAD RWX linker warning
+* [#14981](https://github.com/apache/nuttx/pull/14981) riscv: syscall SYS_switch_context and SYS_restore_context use 0 para
+* [#14642](https://github.com/apache/nuttx/pull/14642) riscv/common/espressif: Fix spi slave driver
+* [#14366](https://github.com/apache/nuttx/pull/14366) riscv/cpustart: Ensure we receive Soft IRQ / IPI before booting CPU
+* [#14765](https://github.com/apache/nuttx/pull/14765) riscv/espressif/bootloader/mcuboot: Sign image with MCUBoot version
+* [#14397](https://github.com/apache/nuttx/pull/14397) riscv/mpfs: Add boilerplate code for SMP
+* [#14967](https://github.com/apache/nuttx/pull/14967) riscv/riscv_ipi.h: Do not write to CSR_MIP.MSIP as it is read-only
+* [#14562](https://github.com/apache/nuttx/pull/14562) riscv/syscall: Fix sched_note instrumentation for BUILD_KERNEL
+* [#14876](https://github.com/apache/nuttx/pull/14876) riscv/syscall.h: Update comment for syscall
+SIM
+* [#14466](https://github.com/apache/nuttx/pull/14466) nuttx/sim: Fix m64 build error.
+* [#14647](https://github.com/apache/nuttx/pull/14647) nuttx/sim: Remove math.h in sim.
+* [#14228](https://github.com/apache/nuttx/pull/14228) nuttx/sim:Remove asan check in up_irq_save().
+* [#14826](https://github.com/apache/nuttx/pull/14826) Revert "sim/m64:Fix ld error."
+* [#14850](https://github.com/apache/nuttx/pull/14850) Revert "sim/make: fix macos sim:nsh make break no -mcmodel in clang"
+* [#14119](https://github.com/apache/nuttx/pull/14119) Revert "sim/note: add note related configuration"
+* [#13878](https://github.com/apache/nuttx/pull/13878) sim bug fix
+* [#14361](https://github.com/apache/nuttx/pull/14361) sim_camera: modify sim camera init videosize using imgsensor extend p…
+* [#14449](https://github.com/apache/nuttx/pull/14449) sim_uart: rm LF to CRLF convertion
+* [#14693](https://github.com/apache/nuttx/pull/14693) sim: add defconfig for testing cmake compilation of quickjs
+* [#14587](https://github.com/apache/nuttx/pull/14587) sim: add note related configuration
+* [#13966](https://github.com/apache/nuttx/pull/13966) sim: disable sim uart output processing
+* [#14462](https://github.com/apache/nuttx/pull/14462) sim: fix asan address space conflict
+* [#14109](https://github.com/apache/nuttx/pull/14109) sim: fix crash caused by function recursion
+* [#14908](https://github.com/apache/nuttx/pull/14908) sim: Fix sim m32 start up crash issue.
+* [#13933](https://github.com/apache/nuttx/pull/13933) sim: fix sim smp boot regression
+* [#14024](https://github.com/apache/nuttx/pull/14024) sim: only POSIX implementation (ARCH_HAVE_MULTICPU) is provided
+* [#14767](https://github.com/apache/nuttx/pull/14767) sim:nsh: Enable `PIPES` to make nsh pipeline available
+* [#14658](https://github.com/apache/nuttx/pull/14658) sim(feat):support sim elf and dynamic libs package in post build
+* [#14341](https://github.com/apache/nuttx/pull/14341) sim/alsa: add ptr check in _stop
+* [#14343](https://github.com/apache/nuttx/pull/14343) sim/alsa: clear AUDIO_APB_FINAL flag before DEQUEUE
+* [#14344](https://github.com/apache/nuttx/pull/14344) sim/alsa: fix runtime warning.
+* [#14797](https://github.com/apache/nuttx/pull/14797) sim/configs/rpserver/rpproxy_virtio: Change the sim 32bit to 64bit compilation
+* [#14348](https://github.com/apache/nuttx/pull/14348) sim/heap: malloc returns a valid pointer when allocating 0 bytes.
+* [#14852](https://github.com/apache/nuttx/pull/14852) sim/m64: Fix ld error.
+* [#14230](https://github.com/apache/nuttx/pull/14230) sim/m64:Fix ld error.
+* [#14982](https://github.com/apache/nuttx/pull/14982) sim/nsh: enable SIM_HOSTFS by default
+* [#14988](https://github.com/apache/nuttx/pull/14988) sim/tflm: add tflite-micro demo into ci build
+* [#15007](https://github.com/apache/nuttx/pull/15007) sim/tflm: enable tflm hello world
+* [#14440](https://github.com/apache/nuttx/pull/14440) arch/sim/cmake: remove the host specific -U when HOSTSRCS. remove the bzero implement use macro to memset
+x86_64
+* [#14957](https://github.com/apache/nuttx/pull/14957) Add kernel build support for X86_64
+* [#14036](https://github.com/apache/nuttx/pull/14036) x64: add acrn ioapic init support
+* [#14081](https://github.com/apache/nuttx/pull/14081) x64: modify addr limit to support 64 bits addr backtrace
+* [#14073](https://github.com/apache/nuttx/pull/14073) X86_64: Add libcxx availability macros.
+* [#14132](https://github.com/apache/nuttx/pull/14132) x86_64: align some code
+* [#14633](https://github.com/apache/nuttx/pull/14633) x86_64: fix compile warning
+* [#13888](https://github.com/apache/nuttx/pull/13888) x86_64: fix regression
+* [#14035](https://github.com/apache/nuttx/pull/14035) x86_64:Fix ld error.
+* [#14900](https://github.com/apache/nuttx/pull/14900) x86-64: Added KASan compilation options
+* [#14885](https://github.com/apache/nuttx/pull/14885) x86: Support symbol table and kasan global variables cross-border detection
+* [#14099](https://github.com/apache/nuttx/pull/14099) x86/x86_64: change the build result from nuttx.elf to nuttx
+* [#14209](https://github.com/apache/nuttx/pull/14209) x86/x86_64:Adjust the position of the nm command to execute it after NuttX is generated
+* [#13983](https://github.com/apache/nuttx/pull/13983) arch/x68_64: properly align ap boot stack for vector operations
+* [#13973](https://github.com/apache/nuttx/pull/13973) arch/x86_64: add support for thread_local
+* [#13937](https://github.com/apache/nuttx/pull/13937) arch/x86_64: Add vfork support
+* [#14040](https://github.com/apache/nuttx/pull/14040) arch/x86_64: cache convert all asm() to __asm__()
+* [#14019](https://github.com/apache/nuttx/pull/14019) arch/x86_64: cpuid expect 32 bit variables
+* [#14087](https://github.com/apache/nuttx/pull/14087) arch/x86_64: Fix SMP startup for ACRN Hypervisor
+* [#14178](https://github.com/apache/nuttx/pull/14178) arch/x86_64: Fix SMP startup for ACRN Hypervisor
+* [#14045](https://github.com/apache/nuttx/pull/14045) arch/x86_64: Fix up_timer_start.
+* [#14021](https://github.com/apache/nuttx/pull/14021) arch/x86_64: idle convert all asm() to __asm__()
+* [#13989](https://github.com/apache/nuttx/pull/13989) arch/x86_64: Map the new page table with read-write permissions
+* [#13982](https://github.com/apache/nuttx/pull/13982) arch/x86_64: Resolve weak symbol compilation relocation errors
+* [#14350](https://github.com/apache/nuttx/pull/14350) arch/x86_64: Resolving NUC Boot Failure Issue
+* [#14349](https://github.com/apache/nuttx/pull/14349) arch/x86_64: The AP retrieves this_task after storing the CPU private…
+* [#13980](https://github.com/apache/nuttx/pull/13980) arch/x86_64:Add allsymbol functionality
+* [#13939](https://github.com/apache/nuttx/pull/13939) arch/x86_64:Add check stack function
+* [#14084](https://github.com/apache/nuttx/pull/14084) arch/x86_64:Add configuration to disable vectorization optimization
+* [#14237](https://github.com/apache/nuttx/pull/14237) arch/x86_64:Add CXX configuration for enabling x86_64 support for C++ applications.
+* [#14405](https://github.com/apache/nuttx/pull/14405) arch/x86_64:Add CXX configuration for enabling x86_64 support for C++…
+* [#14056](https://github.com/apache/nuttx/pull/14056) arch/x86_64:Add macros related to CPUID
+* [#14015](https://github.com/apache/nuttx/pull/14015) arch/x86_64:Add nanosecond delay interface to TSC
+* [#14016](https://github.com/apache/nuttx/pull/14016) arch/x86_64:Add perf tool
+* [#14111](https://github.com/apache/nuttx/pull/14111) arch/x86_64:Change extern g_intstackalloc to g_isrstackalloc
+* [#14133](https://github.com/apache/nuttx/pull/14133) arch/x86_64:Code style is consistent
+* [#13993](https://github.com/apache/nuttx/pull/13993) arch/x86_64:Configure arch delay using CONFIG_ALARM_ARCH
+* [#14075](https://github.com/apache/nuttx/pull/14075) arch/x86_64:Fix build cxx warning.
+* [#14473](https://github.com/apache/nuttx/pull/14473) arch/x86_64:Fix variable used before assignment
+* [#14017](https://github.com/apache/nuttx/pull/14017) arch/x86_64:Use the checkstack function
+* [#14955](https://github.com/apache/nuttx/pull/14955) arch/x86_64/intel64: fix revoke_low_memory
+* [#14958](https://github.com/apache/nuttx/pull/14958) arch/x86_64/intel64: up_disable_irq should work from any CPU
+* [#14060](https://github.com/apache/nuttx/pull/14060) arch/x86_64/intel64/intel64_irq.c: fix busy irq logic
+* [#14245](https://github.com/apache/nuttx/pull/14245) arch/intel64: optimise context switch
+* [#14793](https://github.com/apache/nuttx/pull/14793) intel64: add mutliboot framebuffer support
+* [#14234](https://github.com/apache/nuttx/pull/14234) nuttx/x86_64:Add _sinit and _einit initialization.
+XTENSA
+* [#15055](https://github.com/apache/nuttx/pull/15055) xtensa: inline up_switch_context
+* [#14964](https://github.com/apache/nuttx/pull/14964) xtensa: remove g_running_tasks[this_cpu()] = NULL
+* [#14960](https://github.com/apache/nuttx/pull/14960) xtensa: remove up_set_current_regs/up_current_regs
+* [#15010](https://github.com/apache/nuttx/pull/15010) xtensa: syscall SYS_switch_context and SYS_restore_context use 0 para
+* [#14760](https://github.com/apache/nuttx/pull/14760) xtensa: use up_interrupt_context() to determine if in interrupt context
+* [#14855](https://github.com/apache/nuttx/pull/14855) xtensa/esp32: Remove duplicate board Make.defs
+* [#14541](https://github.com/apache/nuttx/pull/14541) xtensa/esp32s3: add esp32s3 reset reasons interface
+* [#14215](https://github.com/apache/nuttx/pull/14215) xtensa/esp32s3: add support for getting country code
+* [#14542](https://github.com/apache/nuttx/pull/14542) xtensa/esp32s3: enable encrypted flag based on partition and device
+* [#13991](https://github.com/apache/nuttx/pull/13991) xtensa/esp32s3: fix missing peripheral initialization for watchdog timer
+* [#14214](https://github.com/apache/nuttx/pull/14214) xtensa/esp32s3: inspect if partition mapped as text
+* [#14701](https://github.com/apache/nuttx/pull/14701) arch/esp32s3: lcd add fb pandisplay
+* [#14963](https://github.com/apache/nuttx/pull/14963) nuttx/arch: remove the custom board check in up_testset implementation
+* [#14088](https://github.com/apache/nuttx/pull/14088) nuttx/arch:Enabling ARCH_MATH_H is required when compiling sim with the 13.2 version of the toolchain
+* [#14805](https://github.com/apache/nuttx/pull/14805) arch/xtensa: use arch atomic when enable iram heap
+Driver Support
+New Driver Support
+* [#14358](https://github.com/apache/nuttx/pull/14358) drivers/power/battery: add charge/battery health interface support
+* [#13880](https://github.com/apache/nuttx/pull/13880) Add goldfish timer driver support
+* [#14895](https://github.com/apache/nuttx/pull/14895) draft driver for STUSB4500
+Drivers With Improvements
+* [#13925](https://github.com/apache/nuttx/pull/13925) driver: add GOLDFISH_GPU_FB_PRIORITY for goldfish_gpu_fb_vsync_thread
+* [#14194](https://github.com/apache/nuttx/pull/14194) driver/i2c/ipcc: Post sempahore only when it's value is smaller than one
+* [#14510](https://github.com/apache/nuttx/pull/14510) driver/serial: remove return value of up_putc()
+* [#14603](https://github.com/apache/nuttx/pull/14603) drivers: Fix the missing headers.
+* [#14817](https://github.com/apache/nuttx/pull/14817) drivers/adc: Rename up_ads1255initialize to ads1255_initialize
+* [#15011](https://github.com/apache/nuttx/pull/15011) drivers/audio/wm8994.c: Include nuttx/arch.h to fix compilation (up_m…
+* [#13979](https://github.com/apache/nuttx/pull/13979) drivers/battery: Fix Goldfish Battery x64 unresponsive interrupt issue
+* [#13911](https://github.com/apache/nuttx/pull/13911) drivers/coresight: ETM4 set up
+* [#13947](https://github.com/apache/nuttx/pull/13947) drivers/devicetree/fdt: get 'reg' property
+* [#13916](https://github.com/apache/nuttx/pull/13916) drivers/fb: use ENOTTY to replace assert
+* [#14790](https://github.com/apache/nuttx/pull/14790) Drivers/input
+* [#14177](https://github.com/apache/nuttx/pull/14177) drivers/input: fix complie err about undefined
+* [#14728](https://github.com/apache/nuttx/pull/14728) drivers/misc: fix rpmsg dev poll assert crash
+* [#14729](https://github.com/apache/nuttx/pull/14729) drivers/misc: fix rpmsgdev read overflow
+* [#15047](https://github.com/apache/nuttx/pull/15047) drivers/net: change netdev_lower_quota_load to macro
+* [#13860](https://github.com/apache/nuttx/pull/13860) drivers/net: Register "/dev/net/tun" as tun node too
+* [#13872](https://github.com/apache/nuttx/pull/13872) drivers/note: suport rpmsg transfer channel for notesome note api
+* [#14185](https://github.com/apache/nuttx/pull/14185) drivers/optee: Return error if optee_recv return prematurely
+* [#14165](https://github.com/apache/nuttx/pull/14165) drivers/pci: fix pci framework warning in 32bit chip
+* [#14248](https://github.com/apache/nuttx/pull/14248) drivers/rpmsgdev: support get more battery info by rpmsgdev
+* [#14078](https://github.com/apache/nuttx/pull/14078) drivers/rptun: minor fix about rptun
+* [#14256](https://github.com/apache/nuttx/pull/14256) drivers/segger: inline note_sysview_get_timestamp
+* [#14979](https://github.com/apache/nuttx/pull/14979) drivers/sensors/gnss: Add suffix to macro of geofence index
+* [#14999](https://github.com/apache/nuttx/pull/14999) drivers/sensors/gnss: Different nbuffer for each topic
+* [#14298](https://github.com/apache/nuttx/pull/14298) drivers/serial: fix cmsdk serial driver warning
+* [#14411](https://github.com/apache/nuttx/pull/14411) drivers/spi_slave: call SPIS_DEV_NOTIFY when rx or tx complete for all spi slave driver
+* [#14810](https://github.com/apache/nuttx/pull/14810) drivers/syslog: remove implement of syslog_putc()
+* [#15038](https://github.com/apache/nuttx/pull/15038) drivers/timers: export arch timer api to support higher resolution
+* [#13992](https://github.com/apache/nuttx/pull/13992) drivers/timers:Arch_alarm and arch_timer add up_ndelay interface
+* [#14304](https://github.com/apache/nuttx/pull/14304) audio: add offload underflow msg state
+* [#14342](https://github.com/apache/nuttx/pull/14342) audio: remove started from audio_complete
+* [#14385](https://github.com/apache/nuttx/pull/14385) bluetooth: Fix the incompatibility made by https://github.com/apache/nuttx/pull/14224
+* [#14549](https://github.com/apache/nuttx/pull/14549) Bluetooth: improved pairing process and host layer now successfully receives ACL packets
+* [#14224](https://github.com/apache/nuttx/pull/14224) bluetooth: upload bt local bug fix and features
+* [#14985](https://github.com/apache/nuttx/pull/14985) bt_atomic: use atomic macro to replace wireless/bluetooth/bt_atomic.c
+* [#13943](https://github.com/apache/nuttx/pull/13943) misc/assert: add backtrace dump support for mutex hold task
+* [#13952](https://github.com/apache/nuttx/pull/13952) misc/dev_mem: fix compile error in aarch64
+* [#13981](https://github.com/apache/nuttx/pull/13981) misc/rpmsgdev: fix block mode read/write bug in rpmsgdev
+* [#14076](https://github.com/apache/nuttx/pull/14076) misc/rpmsgdev: The private data should be freed only when endpoint is released
+* [#13874](https://github.com/apache/nuttx/pull/13874) mmcsd: add multi partitions prototype implementation
+* [#14293](https://github.com/apache/nuttx/pull/14293) mmcsd: add multi partitions support
+* [#13990](https://github.com/apache/nuttx/pull/13990) mmcsd: refine emmc capacity calculate
+* [#14492](https://github.com/apache/nuttx/pull/14492) mmcsd: SDIO_CAPS_4BIT_ONLY set buswidth MMCSD_SCR_BUSWIDTH_4BIT
+* [#14266](https://github.com/apache/nuttx/pull/14266) mmcsd:add postsleep fields for mmc_ioc_cmd
+* [#14249](https://github.com/apache/nuttx/pull/14249) mmcsd:add reset card to idle state (CMD0) support
+* [#14246](https://github.com/apache/nuttx/pull/14246) mmcsd:add STATUS_SEND (CMD13) support
+* [#14113](https://github.com/apache/nuttx/pull/14113) note enhance
+* [#13948](https://github.com/apache/nuttx/pull/13948) note: change sched_note_counter to a macro
+* [#14926](https://github.com/apache/nuttx/pull/14926) note: Remove enter_critical_section from the sched_note module
+* [#13949](https://github.com/apache/nuttx/pull/13949) note: support asynchronous sched_note_printf output
+* [#13892](https://github.com/apache/nuttx/pull/13892) notesnap_driver.c: modify struct notesnap_s member type
+* [#14382](https://github.com/apache/nuttx/pull/14382) nuttx ai driver update
+* [#14009](https://github.com/apache/nuttx/pull/14009) nuttx/drivers: add ept_release_cb for destroy server resource
+* [#14207](https://github.com/apache/nuttx/pull/14207) nuttx/can: support to Send message priority sorting function.
+* [#14096](https://github.com/apache/nuttx/pull/14096) nuttx/can.h: support timestamp for can frame.
+* [#13866](https://github.com/apache/nuttx/pull/13866) Rpmsg fs: rpmsgfs bug fix and enhancement
+* [#14023](https://github.com/apache/nuttx/pull/14023) Rpmsg ping: improve the rpmsg ping
+* [#13887](https://github.com/apache/nuttx/pull/13887) rpmsg services: should release the tx buffer when rpmsg_send_nocopy failed
+* [#13853](https://github.com/apache/nuttx/pull/13853) Rpmsg syslog: update rpmsg syslog
+* [#14077](https://github.com/apache/nuttx/pull/14077) Rpmsg virtio: update rpmsg virtio and add sim config to verify rpmsg virtio
+* [#14106](https://github.com/apache/nuttx/pull/14106) rpmsg_port_spi_slave: fix compile error when enable RPMSG_PORT_SPI_SL…
+* [#14118](https://github.com/apache/nuttx/pull/14118) rpmsg_sockif: add some modifaction for rpsocket
+* [#13854](https://github.com/apache/nuttx/pull/13854) rpmsgblk.c: fix compile warning
+* [#13851](https://github.com/apache/nuttx/pull/13851) rptun: Remove include/nuttx/rptun/openamp.h
+* [#15008](https://github.com/apache/nuttx/pull/15008) video/fb: fix integer overflow issue
+* [#15043](https://github.com/apache/nuttx/pull/15043) virtio: Add virtio version check
+* [#15074](https://github.com/apache/nuttx/pull/15074) virtio: fix compile error
+* [#15045](https://github.com/apache/nuttx/pull/15045) virtio: Fix the problem of incorrect setting of virtio queue address under label kasan
+* [#15061](https://github.com/apache/nuttx/pull/15061) wm8776: use small lock in drivers/audio/wm8776.c
+* [#13945](https://github.com/apache/nuttx/pull/13945) usensor.c:fix container_of member error.
+* [#14258](https://github.com/apache/nuttx/pull/14258) usb: Fix issue with the calculation descriptor length error
+* [#13960](https://github.com/apache/nuttx/pull/13960) usb: If usb3.0 set the ep0 sssize to cfgdescsize
+* [#13920](https://github.com/apache/nuttx/pull/13920) usbdev/cdcacm: Fix read queue counter in shutdown
+* [#14033](https://github.com/apache/nuttx/pull/14033) uart_16550:fix bug regincr is used multiple times
+* [#13871](https://github.com/apache/nuttx/pull/13871) uart_rpmsg: some bugs fixed
+* [#13879](https://github.com/apache/nuttx/pull/13879) timer & nx_start small bug fix
+* [#14571](https://github.com/apache/nuttx/pull/14571) timer_create:Checks whether the signo provided by the user is valid
+* [#14619](https://github.com/apache/nuttx/pull/14619) timers: Replace DEBUGASSERT with the error code reopen from #12484
+* [#14722](https://github.com/apache/nuttx/pull/14722) SYSLOG_DEFAULT: wrap up_putc/up_nputs calls with critical section
+* [#14362](https://github.com/apache/nuttx/pull/14362) syslog: convert \n to \r\n in syslog framework layer
+* [#14456](https://github.com/apache/nuttx/pull/14456) syslog: Don't allow blocking when in signal handler
+* [#14421](https://github.com/apache/nuttx/pull/14421) syslog: enable LF to CRLF config as default
+* [#14409](https://github.com/apache/nuttx/pull/14409) syslog: fix ramlog not work issue with cmake
+* [#14874](https://github.com/apache/nuttx/pull/14874) syslog.rst: mention the correct kconfig option
+* [#13994](https://github.com/apache/nuttx/pull/13994) support syslog redirection to sched_note
+* [#14212](https://github.com/apache/nuttx/pull/14212) serial: remove 'TIOCSLINID'
+* [#14104](https://github.com/apache/nuttx/pull/14104) serial: use nxsig_tgkill instead of nxsig_kill
+* [#13914](https://github.com/apache/nuttx/pull/13914) serial:update some bug fixand functional improvements
+Board Support
+New Board Support
+* [#14659](https://github.com/apache/nuttx/pull/14659) NSH support for Nucleo-H563ZI.
+Boards With Improvements
+* [#13908](https://github.com/apache/nuttx/pull/13908) board_reset: flush cache before reset
+* [#14520](https://github.com/apache/nuttx/pull/14520) board: refresh boards after update LIBCANUTILS dependency
+* [#13895](https://github.com/apache/nuttx/pull/13895) board/arm/nrf52: fix use up_interrupt_context to is_nesting_interrupt
+* [#15025](https://github.com/apache/nuttx/pull/15025) board/nucleo-h563zi: Add HSE option
+* [#14162](https://github.com/apache/nuttx/pull/14162) board/qemu-armv7a: use fdt_virtio_mmio_devices_register() to register mmio devices
+* [#14287](https://github.com/apache/nuttx/pull/14287) boards: Enable LTO option for same70-xplained/mcuboot-loader
+* [#15070](https://github.com/apache/nuttx/pull/15070) boards: Update configs about system/usbmsc
+* [#14839](https://github.com/apache/nuttx/pull/14839) boards/arm/stm32/nucleo-f4x1re/src/stm32_adc.c: fix typo
+* [#14840](https://github.com/apache/nuttx/pull/14840) boards/arm/stm32/nucleo-f4x1re/stm32_adc.c: remove dependency on AJOYSTICK
+* [#14439](https://github.com/apache/nuttx/pull/14439) boards/arm/stm32f7: fix nucleo boards break for cmake
+* [#14437](https://github.com/apache/nuttx/pull/14437) boards/arm/stm32f7: removed extra endif() from cmakefile for nucleo-f746zg nucleo-f722ze nucleo-f767zi
+* [#14414](https://github.com/apache/nuttx/pull/14414) boards/arm/stm32f7: separate nucleo-144 board into individual boards
+* [#13976](https://github.com/apache/nuttx/pull/13976) stm32f429i-disco: disable TM32_FB_CMAP
+* [#14225](https://github.com/apache/nuttx/pull/14225) stm32f4discovery/testlibcxx: Enable tls to fix build error.
+* [#14223](https://github.com/apache/nuttx/pull/14223) boards/arm64: Add an impls section to the link script
+* [#14687](https://github.com/apache/nuttx/pull/14687) boards/arm64/imx9/imx93-evk: add trdc header
+* [#14720](https://github.com/apache/nuttx/pull/14720) boards/esp32c3-legacy: Add missing include to esp32c3_boot.c
+* [#14947](https://github.com/apache/nuttx/pull/14947) boards/esp32s3: Add ESP32-S3-WROOM-1-N8R8 depends for ESP32S3_DEVKIT
+* [#14481](https://github.com/apache/nuttx/pull/14481) boards/esp32s3: Merge MCUboot and "simple-boot" linker scripts
+* [#15027](https://github.com/apache/nuttx/pull/15027) boards/mte: Dependencies changed so need to delete it now
+* [#14708](https://github.com/apache/nuttx/pull/14708) boards/nucleo-f302r8: fix LED1 pin
+* [#14408](https://github.com/apache/nuttx/pull/14408) boards/nucleo-l432kc: Add internal DAC code.
+* [#14055](https://github.com/apache/nuttx/pull/14055) boards/qemu: Open kasan on qemu
+* [#15012](https://github.com/apache/nuttx/pull/15012) boards/qemu64:  Deleted test program of kasantest config
+* [#14482](https://github.com/apache/nuttx/pull/14482) boards/risc-v: Remove ref to riscv_internal.h
+* [#14261](https://github.com/apache/nuttx/pull/14261) boards/same70-xplained: refine config for insufficient flash capacity
+* [#14853](https://github.com/apache/nuttx/pull/14853) boards/stm32: split nucleo-f4x1re into separate boards
+* [#14762](https://github.com/apache/nuttx/pull/14762) boards/stm32f103-minimum: fix unaligned pointer to .data section in ld.script
+* [#13915](https://github.com/apache/nuttx/pull/13915) boards/stm32f7/stm32f746g-disco: fix FMC pin
+* [#14791](https://github.com/apache/nuttx/pull/14791) boards/x86_64/intel64/qemu-intel64: add jumbo configuration
+* [#14949](https://github.com/apache/nuttx/pull/14949) boards/xtensa/esp32s3: Treat return value that greater than zero as succ
+* [#14508](https://github.com/apache/nuttx/pull/14508) esp32: Fix a heap corruption bug with SPIRAM
+* [#14068](https://github.com/apache/nuttx/pull/14068) esp32[c3]: Add BLE support
+* [#14213](https://github.com/apache/nuttx/pull/14213) ESP32C6-DevKit C/M Add necessary Import to compilation
+* [#14442](https://github.com/apache/nuttx/pull/14442) esp32c6-devkit: Remove -Werror to fix compile error
+* [#14871](https://github.com/apache/nuttx/pull/14871) esp32s3_partition.c: Appease a compiler warning (-Wdiscarded-qualifiers)
+* [#14832](https://github.com/apache/nuttx/pull/14832) esp32s3-devkit doc: Update the procedure after simple boot
+* [#14906](https://github.com/apache/nuttx/pull/14906) esp32s3-devkit: Add configuration for ADB
+* [#15003](https://github.com/apache/nuttx/pull/15003) esp32s3-devkit/usbmsc: Add bind for MTD
+* [#14975](https://github.com/apache/nuttx/pull/14975) esp32s3: don't clear pending interrupts on eg. up_putc
+* [#14501](https://github.com/apache/nuttx/pull/14501) esp32s3: Increase the init task stask size when using NSH
+* [#14942](https://github.com/apache/nuttx/pull/14942) espressif/mcpwm: fix compile error
+File System
+Improvements
+* [#14071](https://github.com/apache/nuttx/pull/14071) binfmt/libelf: Fix return code
+* [#14039](https://github.com/apache/nuttx/pull/14039) fs poll optimize
+* [#14752](https://github.com/apache/nuttx/pull/14752) fs_automount:fix ci break
+* [#14184](https://github.com/apache/nuttx/pull/14184) fs_file.c: modify files_countlist comments
+* [#14137](https://github.com/apache/nuttx/pull/14137) fs_heap_strdup/asprintf
+* [#13907](https://github.com/apache/nuttx/pull/13907) fs_open:Adjust the definition of the open path
+* [#14461](https://github.com/apache/nuttx/pull/14461) fs: add fs_heap_strndup replace strndup with fs_heap_strndup
+* [#14673](https://github.com/apache/nuttx/pull/14673) fs: add merge partitions support
+* [#13926](https://github.com/apache/nuttx/pull/13926) fs: fix compile break
+* [#14609](https://github.com/apache/nuttx/pull/14609) fs: Fix mtd/sector512.c:554:19: error: incomplete definition of type 'struct partition_info_s'
+* [#13928](https://github.com/apache/nuttx/pull/13928) fs: fix wrong config for FS_SHMFS
+* [#14903](https://github.com/apache/nuttx/pull/14903) fs/littlefs: Add a kconfig to override littlefs version
+* [#14935](https://github.com/apache/nuttx/pull/14935) fs/littlefs: make CONFIG_FS_LITTLEFS_VERSION include the "v" prefix
+* [#14956](https://github.com/apache/nuttx/pull/14956) fs/littlefs: stop applying local patches for unknown versions of littlefs
+* [#14445](https://github.com/apache/nuttx/pull/14445) fs/mnemofs: Add logs to bind and unbind.
+* [#14463](https://github.com/apache/nuttx/pull/14463) fs/mnemofs: Fix extra log unused value error.
+* [#14533](https://github.com/apache/nuttx/pull/14533) fs/mnemofs: Fix mkdir for depth > 3 bug better logs
+* [#14604](https://github.com/apache/nuttx/pull/14604) fs/mnemofs: Fix open and rmdir return value and seek out of bounds.
+* [#14528](https://github.com/apache/nuttx/pull/14528) fs/nfs: fix offset in append mode and attributes after create
+* [#14429](https://github.com/apache/nuttx/pull/14429) fs/nxffs: Fix syslog formats compile error
+* [#14948](https://github.com/apache/nuttx/pull/14948) fs/partition/txtable: Fix panic when no txtable was found in last eraseblock
+* [#14763](https://github.com/apache/nuttx/pull/14763) fs/procfs: The procfsversion should be under control of `FS_PROCFS_EXCLUDE_VERSION`
+* [#14359](https://github.com/apache/nuttx/pull/14359) fs/rpmsgfs[bug fix]: return real err value when open failed
+* [#13931](https://github.com/apache/nuttx/pull/13931) fs/semaphore: fix a minor issue with goto label
+* [#14582](https://github.com/apache/nuttx/pull/14582) fs/shm: support shm_open with flags O_TRUNC
+* [#13929](https://github.com/apache/nuttx/pull/13929) fs/vfs: Avoid calling stat with oldrelpath twice in mountptrename
+* [#14702](https://github.com/apache/nuttx/pull/14702) fs/vfs: Fix initialization of `g_pseudofile_ops`
+* [#13918](https://github.com/apache/nuttx/pull/13918) nuttx/fs:Rename node with inode.
+* [#13900](https://github.com/apache/nuttx/pull/13900) zipfs:zipfs not need mtd drivers
+Networking
+Improvements
+* [#14535](https://github.com/apache/nuttx/pull/14535) arp.h: make struct arpreq four-byte aligned
+* [#14556](https://github.com/apache/nuttx/pull/14556) arp.h: make struct arpreq four-byte aligned
+* [#14650](https://github.com/apache/nuttx/pull/14650) net: fix inet #14634 regression
+* [#14634](https://github.com/apache/nuttx/pull/14634) net: inet.h match inet_sockif.c definition
+* [#14886](https://github.com/apache/nuttx/pull/14886) net: Move NET_TCP/UDP_HAVE_STACK to netconfig.h
+* [#14727](https://github.com/apache/nuttx/pull/14727) net:Compatible with cellular network cards of lladdr generation
+* [#14092](https://github.com/apache/nuttx/pull/14092) net/can: Save simple options to socket_conn_s
+* [#14643](https://github.com/apache/nuttx/pull/14643) net/igc: Support Intel I226V.
+* [#14018](https://github.com/apache/nuttx/pull/14018) net/local: fix the return address is incorrect when accept
+* [#14447](https://github.com/apache/nuttx/pull/14447) net/local: fix used after free
+* [#14630](https://github.com/apache/nuttx/pull/14630) net/netlink: fix netlink poll return value on success
+* [#13905](https://github.com/apache/nuttx/pull/13905) net/rpmsg: add SO_SNDBUF and SO_RCVBUF support
+* [#14573](https://github.com/apache/nuttx/pull/14573) net/rpmsg: Don't set POLLHUP if rpmsg channel has not been established
+* [#14216](https://github.com/apache/nuttx/pull/14216) net/tcp: Reset the conn when receiving a ACK in the SYN_SENT state.
+* [#14529](https://github.com/apache/nuttx/pull/14529) net/usrsock: usrsock supports offload netlink
+* [#14163](https://github.com/apache/nuttx/pull/14163) net/vsock: add AF_VSOCK address family
+* [#14138](https://github.com/apache/nuttx/pull/14138) netdb: fix may add duplicate DNS servers
+* [#14192](https://github.com/apache/nuttx/pull/14192) netdev:In netdev_defaultIf there is only one loopback network devices it returns NULL
+* [#14636](https://github.com/apache/nuttx/pull/14636) netinet/if_ether.h: move #define ETH_XXX into if_ether.h
+* [#13859](https://github.com/apache/nuttx/pull/13859) Netlink minor fix
+* [#14554](https://github.com/apache/nuttx/pull/14554) DNS: Implement TCP fallback
+* [#14867](https://github.com/apache/nuttx/pull/14867) IPV6 macro
+* [#13906](https://github.com/apache/nuttx/pull/13906) local_sock: fix accept use-after-free
+* [#14103](https://github.com/apache/nuttx/pull/14103) local_socket: corrent send/recv return value after shutdown
+* [#14574](https://github.com/apache/nuttx/pull/14574) tcp_input: if tcp->req > recvreq send ack only when state is TCP_ESTABLISHED
+* [#14698](https://github.com/apache/nuttx/pull/14698) tcp: fix tcp can not retransmit timely when ACK with TCP_NEWDATA
+* [#14595](https://github.com/apache/nuttx/pull/14595) sys/socket: fix struct sockaddr_storage alignment issue
+Unsorted
+* [#14278](https://github.com/apache/nuttx/pull/14278) add  lin status changes the format of the reported frame and add the …
+* [#14112](https://github.com/apache/nuttx/pull/14112) add #define CPU_SETSIZE in sched.h
+* [#14332](https://github.com/apache/nuttx/pull/14332) add a flag of lin internal sleep/wakeup state
+* [#14303](https://github.com/apache/nuttx/pull/14303) Add AI engine driver for heterogeneous NPU backends.
+* [#13904](https://github.com/apache/nuttx/pull/13904) Add base64 support to coredump to reduce syslog output size
+* [#14130](https://github.com/apache/nuttx/pull/14130) Add GCCVER define to Toolchain.
+* [#13999](https://github.com/apache/nuttx/pull/13999) add gprof support
+* [#13847](https://github.com/apache/nuttx/pull/13847) Add heap note support
+* [#14339](https://github.com/apache/nuttx/pull/14339) Add imx9 socketcan
+* [#14125](https://github.com/apache/nuttx/pull/14125) add lin error flags to lin.h
+* [#14801](https://github.com/apache/nuttx/pull/14801) add spinlock_type.h and use small lock to protect filelist
+* [#14321](https://github.com/apache/nuttx/pull/14321) Add strptime
+* [#13964](https://github.com/apache/nuttx/pull/13964) Add support fchstat and chstat  function for littlefs
+* [#14866](https://github.com/apache/nuttx/pull/14866) Add tls cleanup to protect tcp
+* [#14951](https://github.com/apache/nuttx/pull/14951) Add TXTABLE support for esp32s3
+* [#14966](https://github.com/apache/nuttx/pull/14966) Add USB MSC support for esp32s3
+* [#13951](https://github.com/apache/nuttx/pull/13951) Adding partitioning support for OTA
+* [#15035](https://github.com/apache/nuttx/pull/15035) addrenv: Ensure that the transmission parameter of addrenv_switch is not NULL
+* [#14859](https://github.com/apache/nuttx/pull/14859) addrenv/addrenv.c: Use atomic_ functions to handle the reference counter
+* [#14065](https://github.com/apache/nuttx/pull/14065) assert: change the do-while of assert to a conditional expression
+* [#14879](https://github.com/apache/nuttx/pull/14879) assert: in assert we use small spinlock replace enter_critical_section
+* [#14353](https://github.com/apache/nuttx/pull/14353) bug/fix: Makefile expression error caused
+* [#14420](https://github.com/apache/nuttx/pull/14420) Bugfix/fix esp spi slave receive data
+* [#14211](https://github.com/apache/nuttx/pull/14211) Bugfix/samv7 rswdt
+* [#13865](https://github.com/apache/nuttx/pull/13865) cache: do cache_invalidate_all before enable dcache
+* [#14809](https://github.com/apache/nuttx/pull/14809) can/sja100: leave critical section properly
+* [#13953](https://github.com/apache/nuttx/pull/13953) case SIOCGIWNAME: add filter out non-802.11 interfaces
+* [#14241](https://github.com/apache/nuttx/pull/14241) Change the judgment of GCCVER version to greater equal.
+* [#14182](https://github.com/apache/nuttx/pull/14182) Changed the i3c_priv_xfer's member to flags from rnw
+* [#14300](https://github.com/apache/nuttx/pull/14300) circbuf: fix circbuf_get_read/writeptr return *size = 0 when circbuf full
+* [#13848](https://github.com/apache/nuttx/pull/13848) circbuf: Move from mm/circbuf to libs/libc/misc
+* [#14713](https://github.com/apache/nuttx/pull/14713) com/can: Remove unnecessary judgment logic
+* [#15051](https://github.com/apache/nuttx/pull/15051) configs: Add defconfigs for esp-sparrow-kit
+* [#14131](https://github.com/apache/nuttx/pull/14131) Contributing and PR template fix.
+* [#14792](https://github.com/apache/nuttx/pull/14792) cosmetic changes in drivers/pci and drivers/sensors
+* [#14179](https://github.com/apache/nuttx/pull/14179) cpuinfo: Decouple the fetch cpuinfo from up_perf_getfreq
+* [#14997](https://github.com/apache/nuttx/pull/14997) crashdump change to choice add coredump to mtd support based on mtdout stream.
+* [#14674](https://github.com/apache/nuttx/pull/14674) crypto/se05x: Allow set_enable_pin to be NULL and fix error handling
+* [#13899](https://github.com/apache/nuttx/pull/13899) Deadlock detect fix
+* [#15042](https://github.com/apache/nuttx/pull/15042) debug symbol level: Use config instead
+* [#14378](https://github.com/apache/nuttx/pull/14378) Discourage the use of LIBC_PRINT_EXTENSION
+* [#14094](https://github.com/apache/nuttx/pull/14094) dump more information when CONFIG_MM_DUMP_DETAILS_ON_FAILURE enabled flush log before coredump
+* [#13902](https://github.com/apache/nuttx/pull/13902) e1000: add polling mode support for tx/rx
+* [#14646](https://github.com/apache/nuttx/pull/14646) Enable DEV_PIPE_NPOLLWAITERS default value 4 for adapte APP
+* [#14318](https://github.com/apache/nuttx/pull/14318) Expand samplerate bits from 8 to 32 enchance encode capacity in sim offload.
+* [#14310](https://github.com/apache/nuttx/pull/14310) external/ffmpeg: add offloding audio recording with amr format.
+* [#13867](https://github.com/apache/nuttx/pull/13867) Fdt mmio: add common fdt mmio virtio device register function
+* [#14591](https://github.com/apache/nuttx/pull/14591) Feature/esp i2c bitbang
+* [#14590](https://github.com/apache/nuttx/pull/14590) Feature/esp spi bitbang
+* [#14008](https://github.com/apache/nuttx/pull/14008) Feature/esp temp sensor uorb support
+* [#14597](https://github.com/apache/nuttx/pull/14597) file_readv_compat/file_writev_compat: Fix partial success handling
+* [#13921](https://github.com/apache/nuttx/pull/13921) files_getlist:Handling the situation when tcb's grouplist is empty
+* [#15019](https://github.com/apache/nuttx/pull/15019) First commit of STM32H5 SPI Hardware file.
+* [#13875](https://github.com/apache/nuttx/pull/13875) Fix #13873
+* [#14861](https://github.com/apache/nuttx/pull/14861) Fix ALIGN_UP duplicate definition error
+* [#14396](https://github.com/apache/nuttx/pull/14396) fix bmi160 some issue
+* [#14938](https://github.com/apache/nuttx/pull/14938) fix build error
+* [#14392](https://github.com/apache/nuttx/pull/14392) fix build error shift-count-overflow
+* [#14500](https://github.com/apache/nuttx/pull/14500) Fix CDCNCM driver printf formatter compiler warning
+* [#14945](https://github.com/apache/nuttx/pull/14945) Fix compilation errors
+* [#15004](https://github.com/apache/nuttx/pull/15004) Fix compile error
+* [#15014](https://github.com/apache/nuttx/pull/15014) fix compile error
+* [#14716](https://github.com/apache/nuttx/pull/14716) fix compiler error when CONFIG_CLOCK_TIMEKEEPING=y
+* [#14552](https://github.com/apache/nuttx/pull/14552) Fix config repeat define in include deconfig mode
+* [#14356](https://github.com/apache/nuttx/pull/14356) Fix disable msi when msi capability not exist issue
+* [#14610](https://github.com/apache/nuttx/pull/14610) Fix Error: implicit declaration of function 'enter_critical_section'
+* [#14433](https://github.com/apache/nuttx/pull/14433) fix GCCVER cmake define.
+* [#14188](https://github.com/apache/nuttx/pull/14188) fix igmp group issue
+* [#14453](https://github.com/apache/nuttx/pull/14453) Fix Kconfig style
+* [#14882](https://github.com/apache/nuttx/pull/14882) Fix Kconfig style
+* [#14606](https://github.com/apache/nuttx/pull/14606) fix macos sim nsh break fix no -mcmodel=medium in clang.
+* [#14422](https://github.com/apache/nuttx/pull/14422) Fix make warn as error in pci drivers
+* [#14820](https://github.com/apache/nuttx/pull/14820) Fix minor ld script error
+* [#14965](https://github.com/apache/nuttx/pull/14965) fix nxstyle
+* [#14977](https://github.com/apache/nuttx/pull/14977) fix nxstyle
+* [#14944](https://github.com/apache/nuttx/pull/14944) Fix path Error
+* [#14971](https://github.com/apache/nuttx/pull/14971) Fix path error
+* [#14611](https://github.com/apache/nuttx/pull/14611) fix regression caused by remove sync pause
+* [#14001](https://github.com/apache/nuttx/pull/14001) fix runtime pm pm_wakelock_uninit problem decrease charger log regulator possible no action when boot
+* [#13917](https://github.com/apache/nuttx/pull/13917) fix snprintf truncation warnings
+* [#14458](https://github.com/apache/nuttx/pull/14458) Fix some build error
+* [#14925](https://github.com/apache/nuttx/pull/14925) fix some build error
+* [#14837](https://github.com/apache/nuttx/pull/14837) fix some comment in https://github.com/apache/nuttx/pull/14764
+* [#13909](https://github.com/apache/nuttx/pull/13909) Fix some compile warnings in net directory
+* [#14873](https://github.com/apache/nuttx/pull/14873) Fix some minor style issues
+* [#14677](https://github.com/apache/nuttx/pull/14677) Fix STM32H5 Serial APB Clock Sources
+* [#14108](https://github.com/apache/nuttx/pull/14108) Fix system crash when set CONFIG_PRIORITY_INHERITANCE=y
+* [#14818](https://github.com/apache/nuttx/pull/14818) Fix timers/arch_alarm.c:109:3: error: 'now' may be used uninitialized
+* [#13977](https://github.com/apache/nuttx/pull/13977) Fix to compile parameters not taking effect When cmake version is greater than 3.18
+* [#14072](https://github.com/apache/nuttx/pull/14072) fix typo error
+* [#14737](https://github.com/apache/nuttx/pull/14737) Fix typo errors in include/nuttx/clock.h
+* [#14489](https://github.com/apache/nuttx/pull/14489) Fix xtensa build error with choice LIBSUPCXX by default.
+* [#14828](https://github.com/apache/nuttx/pull/14828) fix: remove duplicated statistics of upd.drop
+* [#14889](https://github.com/apache/nuttx/pull/14889) fix(rp2350): should copy data before init clock
+* [#15024](https://github.com/apache/nuttx/pull/15024) float.h: Define FLT_ROUNDS if not defined by toolchain previously
+* [#14869](https://github.com/apache/nuttx/pull/14869) getifaddrs support returning multiple IPv6 addresses
+* [#14037](https://github.com/apache/nuttx/pull/14037) Getline support backspace
+* [#14232](https://github.com/apache/nuttx/pull/14232) gnu++20:fix ld error.
+* [#14098](https://github.com/apache/nuttx/pull/14098) goldfish add gicv2m support
+* [#14090](https://github.com/apache/nuttx/pull/14090) goldfish fix forget clear interrrpt add in cmake
+* [#14122](https://github.com/apache/nuttx/pull/14122) goldfish: sync with qemu do rpmsg_syslog init at goldfish
+* [#14725](https://github.com/apache/nuttx/pull/14725) gprof: Add a configuration dependency
+* [#14740](https://github.com/apache/nuttx/pull/14740) gprof: move gprof function from sched to libbuiltin/libgcc
+* [#14717](https://github.com/apache/nuttx/pull/14717) GreenHills Support: add __ARM_ARCH __ARM_FEATURE_DSP macro definition when build with ghs compiler
+* [#14825](https://github.com/apache/nuttx/pull/14825) GreenHills support: add thumb mode detection support for ghs compiler
+* [#14269](https://github.com/apache/nuttx/pull/14269) greenhills support: fix the build warning with ghs compiler
+* [#14719](https://github.com/apache/nuttx/pull/14719) GreenHills support: fix the naked_function attr cannot handle warning with old version GHS compiler
+* [#14718](https://github.com/apache/nuttx/pull/14718) GreenHills support: fix the naked_function function non-compatible issue with arm_svcall
+* [#14836](https://github.com/apache/nuttx/pull/14836) group_signal_handler: Remove a redundant check
+* [#13944](https://github.com/apache/nuttx/pull/13944) group: access group in critical section
+* [#14766](https://github.com/apache/nuttx/pull/14766) icjx: disable interrupts in interrupt worker
+* [#14443](https://github.com/apache/nuttx/pull/14443) Implement ADC driver interface for MCP3008
+* [#14285](https://github.com/apache/nuttx/pull/14285) Implement Position-Independent-Code (PIC) loading
+* [#14812](https://github.com/apache/nuttx/pull/14812) in smp_call handle we only change TCB_FLAG_CPU_LOCKED bit of tcb->flag
+* [#13869](https://github.com/apache/nuttx/pull/13869) inotify: support truncate and close calls
+* [#15002](https://github.com/apache/nuttx/pull/15002) install kconfiglib using apt repo
+* [#14567](https://github.com/apache/nuttx/pull/14567) irq: force inline up_interrupt_context
+* [#14199](https://github.com/apache/nuttx/pull/14199) irq: irq_attach_wqueue replace irq_attach_thread
+* [#14856](https://github.com/apache/nuttx/pull/14856) irq/irq.h: Remove extern of non-existent global
+* [#14686](https://github.com/apache/nuttx/pull/14686) isrthread: add configuring the stack of an isrthread as static
+* [#14452](https://github.com/apache/nuttx/pull/14452) kconfig: Add link parameters that can print remaining memory information
+* [#14325](https://github.com/apache/nuttx/pull/14325) Kconfig:Add an option to disable compilation of floating point
+* [#15005](https://github.com/apache/nuttx/pull/15005) lc823450_usbdev: use small lock in arch/arm/src/lc823450/lc823450_usbdev.c
+* [#14893](https://github.com/apache/nuttx/pull/14893) lm3s6965-ek/qemu: Using default max command line length
+* [#14000](https://github.com/apache/nuttx/pull/14000) long double need use the format of 'Lf'
+* [#14635](https://github.com/apache/nuttx/pull/14635) macos: fix “sed: -I or -i may not be used with stdin”
+* [#15048](https://github.com/apache/nuttx/pull/15048) make arm-v6/7/8m compatible with signal delivery inside irq handler
+* [#14696](https://github.com/apache/nuttx/pull/14696) makefile/build: Delete unnecessary bin and kbin folders
+* [#14049](https://github.com/apache/nuttx/pull/14049) makefile/clang: Compare versions for upward compatibility
+* [#13864](https://github.com/apache/nuttx/pull/13864) math: remove is_power_of_2() keep IS_POWER_OF_2()
+* [#15006](https://github.com/apache/nuttx/pull/15006) max32660_wdt: use small lock in arch/arm/src/max326xx/max32660/max32660_wdt.c
+* [#13898](https://github.com/apache/nuttx/pull/13898) Memory delay free kasan error fix and  memory note fix
+* [#14146](https://github.com/apache/nuttx/pull/14146) mempool: add the minimum size configuration of mempool
+* [#14410](https://github.com/apache/nuttx/pull/14410) merge some nrf52 configurations into one 
+* [#14821](https://github.com/apache/nuttx/pull/14821) minor code refactor
+* [#14617](https://github.com/apache/nuttx/pull/14617) Minor improve blkoutstream and mtdoutstream
+* [#14334](https://github.com/apache/nuttx/pull/14334) modify for set conn status with connected when receive event USRSOCK_EVENT_SENDTO_READY
+* [#14205](https://github.com/apache/nuttx/pull/14205) modlib:bug fixallow 64bit elf load and if sym is NULL not load symbol
+* [#14732](https://github.com/apache/nuttx/pull/14732) modlib:need add ctors to init_array and dtors to fini_array
+* [#14383](https://github.com/apache/nuttx/pull/14383) modlib/modlib_symbols.c: Fix usage of void* arithmetics
+* [#14990](https://github.com/apache/nuttx/pull/14990) mps3an547 doc update
+* [#13927](https://github.com/apache/nuttx/pull/13927) mq: correct inode release in mq_inode_release()
+* [#14654](https://github.com/apache/nuttx/pull/14654) msys2: fix make[3]: warning: jobserver unavailable: using -j1.
+* [#14189](https://github.com/apache/nuttx/pull/14189) mtd/nvs: Trigger recovery process in nvs_startup
+* [#14053](https://github.com/apache/nuttx/pull/14053) nuttx-names.in: add feof
+* [#14468](https://github.com/apache/nuttx/pull/14468) nuttx: Add LIBSUPCXX_TOOLCHAIN to link the prebuilt library provide by toolchain.
+* [#14543](https://github.com/apache/nuttx/pull/14543) nuttx: Fix build warning with can't found xt-g++
+* [#14721](https://github.com/apache/nuttx/pull/14721) nuttx/qemu: Fix funciton up_idle multiple definition
+* [#13923](https://github.com/apache/nuttx/pull/13923) Pci bugfix
+* [#13963](https://github.com/apache/nuttx/pull/13963) Pci fixbugs
+* [#14969](https://github.com/apache/nuttx/pull/14969) Pci io
+* [#14124](https://github.com/apache/nuttx/pull/14124) pci_ivshmem.c: ivshmem_support_irq API support
+* [#15071](https://github.com/apache/nuttx/pull/15071) pci: fix pci dev alloc bridge mem error
+* [#13897](https://github.com/apache/nuttx/pull/13897) pci: msi and msix irq need release irq
+* [#14126](https://github.com/apache/nuttx/pull/14126) pci.h: add pci_write/read_mmio_qword support
+* [#14097](https://github.com/apache/nuttx/pull/14097) PFU: do not cause execution of any instructions to be trapped
+* [#14621](https://github.com/apache/nuttx/pull/14621) Pico SDK version bump + assimilate old READMEs into RST
+* [#14904](https://github.com/apache/nuttx/pull/14904) Publish GDB Plugin as a standard python package
+* [#14253](https://github.com/apache/nuttx/pull/14253) Py code check update
+* [#13850](https://github.com/apache/nuttx/pull/13850) qemu & goldfish update
+* [#14505](https://github.com/apache/nuttx/pull/14505) qemu-intel64: Fixes the linker 'noexecstack' warning
+* [#14423](https://github.com/apache/nuttx/pull/14423) ramlog: Remove RAMLOG_CRLF config and related code
+* [#14733](https://github.com/apache/nuttx/pull/14733) rammtd:add rammtd_uninitialize
+* [#13912](https://github.com/apache/nuttx/pull/13912) release msi/msix irq clean capability struct
+* [#14736](https://github.com/apache/nuttx/pull/14736) Remove "dumprun" functions from various LCD drivers
+* [#14649](https://github.com/apache/nuttx/pull/14649) Remove all jira and changeid information from the kernel
+* [#15050](https://github.com/apache/nuttx/pull/15050) Remove FAR from 32/64bit arch
+* [#14450](https://github.com/apache/nuttx/pull/14450) Remove ndelay_accurate
+* [#14613](https://github.com/apache/nuttx/pull/14613) remove nxsched_lock_irq/nxsched_unlock_irq
+* [#15046](https://github.com/apache/nuttx/pull/15046) remove redundant judgments *running_task != NULL
+* [#14974](https://github.com/apache/nuttx/pull/14974) remove redundant scheduling records
+* [#14814](https://github.com/apache/nuttx/pull/14814) remove sched_lock in pthread_cond_broadcast
+* [#14469](https://github.com/apache/nuttx/pull/14469) remove unused variable 'cpu_freq'
+* [#14475](https://github.com/apache/nuttx/pull/14475) remove unused variable 'cpu_freq'
+* [#13863](https://github.com/apache/nuttx/pull/13863) remove up_cpu_pause up_cpu_resume up_cpu_paused up_cpu_pausereq
+* [#14596](https://github.com/apache/nuttx/pull/14596) remove up_current_regs in common code
+* [#14608](https://github.com/apache/nuttx/pull/14608) Replace __attribute__((packed)) with [begin|end]_packed_struct
+* [#14751](https://github.com/apache/nuttx/pull/14751) Revert "SYSLOG_DEFAULT: wrap up_putc/up_nputs calls with critical sec…
+* [#14806](https://github.com/apache/nuttx/pull/14806) Revert "system: pthread_barrierwait should be moved to kernel space"
+* [#14338](https://github.com/apache/nuttx/pull/14338) Revert "Update esptool version on docs and build system"
+* [#14180](https://github.com/apache/nuttx/pull/14180) sdio_probe: set voltage use CMD5
+* [#14802](https://github.com/apache/nuttx/pull/14802) segger/stream_rtt: fix warning after stream update
+* [#14465](https://github.com/apache/nuttx/pull/14465) sem: change sem wait to atomic operation
+* [#14152](https://github.com/apache/nuttx/pull/14152) setjmp: fix setjmp returns 0 when calling longjmp with 0 as the secon…
+* [#14276](https://github.com/apache/nuttx/pull/14276) shm:fix build error
+* [#14524](https://github.com/apache/nuttx/pull/14524) Shmfs bug fix
+* [#14822](https://github.com/apache/nuttx/pull/14822) Simplify PCI driver configuration
+* [#14656](https://github.com/apache/nuttx/pull/14656) smpcall: add nxsched_smp_call_async and nxsched_smp_call_single_async
+* [#14663](https://github.com/apache/nuttx/pull/14663) smpcall: we directly call the function to handle local smpcall
+* [#14337](https://github.com/apache/nuttx/pull/14337) Socketcan fixes
+* [#14346](https://github.com/apache/nuttx/pull/14346) socketpair.c:Replace kmm with fs heap
+* [#14927](https://github.com/apache/nuttx/pull/14927) spelling: fix spelling typo premption -> preemption
+* [#14939](https://github.com/apache/nuttx/pull/14939) spinlock: remove recursive locks with write_lock_irqsave/read_lock_irqsave
+* [#14931](https://github.com/apache/nuttx/pull/14931) spinlock: use spin_lock_init replace spin_initialize
+* [#14989](https://github.com/apache/nuttx/pull/14989) st7789: add configuration option to set default background color
+* [#14924](https://github.com/apache/nuttx/pull/14924) stream_getc: use lib_stream_eof instead of EOF
+* [#14844](https://github.com/apache/nuttx/pull/14844) Support enabling/disabling attr attribute in littlefs for nuttx
+* [#14678](https://github.com/apache/nuttx/pull/14678) Support for the Seeed Studio XIAO SAMD21
+* [#14093](https://github.com/apache/nuttx/pull/14093) Support note print in Segger Sysview terminal
+* [#13910](https://github.com/apache/nuttx/pull/13910) Support shutdown
+* [#14168](https://github.com/apache/nuttx/pull/14168) support trace_beginex and trace_endex
+* [#14196](https://github.com/apache/nuttx/pull/14196) systick:when isr_handle is NULL will be crash.
+* [#14483](https://github.com/apache/nuttx/pull/14483) task_exit.c: Add missing sched_note_stop()
+* [#13924](https://github.com/apache/nuttx/pull/13924) This patch is to allow the application layer to use ioctl to send can/lin status control information to the driver layer.
+* [#14156](https://github.com/apache/nuttx/pull/14156) tlsr82/nsh: set LIBC_RAND_ORDER be 0 to fix compile error
+* [#13852](https://github.com/apache/nuttx/pull/13852) unify MODULE & ELF flag to Toolchain.defs
+* [#14100](https://github.com/apache/nuttx/pull/14100) Unify the code of libelf and modlib and delete the implementation of libelf
+* [#14159](https://github.com/apache/nuttx/pull/14159) Unify the definition of GCCVER and remove duplicate code.
+* [#14848](https://github.com/apache/nuttx/pull/14848) Unify the linking options for 32-bit and 64-bit to text-segment=0x3000000.
+* [#14707](https://github.com/apache/nuttx/pull/14707) Update BOARD_USExxx naming input clock selection and setting of HSIDIV
+* [#15067](https://github.com/apache/nuttx/pull/15067) Update cdc.h to fix typo in the comments
+* [#14283](https://github.com/apache/nuttx/pull/14283) update defconfig
+* [#14120](https://github.com/apache/nuttx/pull/14120) Update esptool version on docs and build system
+* [#14794](https://github.com/apache/nuttx/pull/14794) update Intel64 and PCI documentation
+* [#14778](https://github.com/apache/nuttx/pull/14778) update stream relative fix mtd&blk stream readback before block update. decrese int use in stream to handle FS_LARGEFILE
+* [#13889](https://github.com/apache/nuttx/pull/13889) update the mm dump relative add orphan & biggest dump feature.
+* [#13913](https://github.com/apache/nuttx/pull/13913) Upgrade openamp and libmetal to last commit
+* [#14255](https://github.com/apache/nuttx/pull/14255) Use BACKTRACE_BUFFER_SIZE to declare backtrace buffer
+* [#14517](https://github.com/apache/nuttx/pull/14517) Use memalign to align share memory to CPU cache line size
+* [#14632](https://github.com/apache/nuttx/pull/14632) Use pathbuffer reduce stack
+* [#14181](https://github.com/apache/nuttx/pull/14181) use r1-r3 as tmp register
+* [#14930](https://github.com/apache/nuttx/pull/14930) use spin_lock_wo_note replace spin_lock in csection
+* [#14351](https://github.com/apache/nuttx/pull/14351) userspace: Exclude nuttx/arch.h
+* [#14953](https://github.com/apache/nuttx/pull/14953) Various improvements for e1000 and igc
+* [#14279](https://github.com/apache/nuttx/pull/14279) vsprintf:fix bug when print int64 0x8000000000000000
+* [#14499](https://github.com/apache/nuttx/pull/14499) when COMPILE_OPTIONS is not set skip the REMOVE_ITEM in ${HOSTSRCS} fix msvc reported case.
--- a/Documentation/applications/interpreters/python/index.rst
+++ b/Documentation/applications/interpreters/python/index.rst
@ -38,13 +38,35 @@ This will generate a ``nutxx`` binary. This file can be run using the RISC-V QEM
 Try Python in NSH
 =================

+Before running the RISC-V QEMU, create a raw disk image with the following command:
+
 .. code:: console

-   $ .qemu-system-riscv32 -semihosting -M virt,aclint=on -cpu rv32 -smp 1 -bios none -kernel nuttx -nographic
+   $ dd if=/dev/zero of=./mydisk-1gb.img bs=1M count=1024
+
+Then, run RISC-V QEMU with the following command:
+
+.. code:: console
+
+   $ qemu-system-riscv32 -semihosting -M virt,aclint=on -cpu rv32 -smp 8 \
+      -global virtio-mmio.force-legacy=false \
+      -device virtio-serial-device,bus=virtio-mmio-bus.0 \
+      -chardev socket,telnet=on,host=127.0.0.1,port=3450,server=on,wait=off,id=foo \
+      -device virtconsole,chardev=foo \
+      -device virtio-rng-device,bus=virtio-mmio-bus.1 \
+      -netdev user,id=u1,hostfwd=tcp:127.0.0.1:10023-10.0.2.15:23,hostfwd=tcp:127.0.0.1:15001-10.0.2.15:5001 \
+      -device virtio-net-device,netdev=u1,bus=virtio-mmio-bus.2 \
+      -drive file=./mydisk-1gb.img,if=none,format=raw,id=hd \
+      -device virtio-blk-device,bus=virtio-mmio-bus.3,drive=hd \
+      -bios none -kernel ./nuttx -nographic
+
+   ABC[    0.062131] board_userled: LED 1 set to 0
+   [    0.063269] board_userled: LED 2 set to 0
+   [    0.063367] board_userled: LED 3 set to 0
+   telnetd [4:100]

-   ABC
   NuttShell (NSH) NuttX-10.4.0
-   nsh> mount_modules
+   nsh> python_mount_modules
   Mounting ROMFS filesystem at target=/usr/local/lib/ with source=/dev/ram1
   nsh> export PYTHONHOME /usr/local
   nsh> export PYTHON_BASIC_REPL 1
@ -58,5 +80,5 @@ Demo

 Check the following `asciinema <https://asciinema.org/>`_ demo to see how to run Python on NuttX. You can copy and paste the commands from the demo to try it yourself.

-.. image:: https://asciinema.org/a/orkD8fKuahMEgQfBak9abliE4.svg
-   :target: https://asciinema.org/a/orkD8fKuahMEgQfBak9abliE4
+.. image:: https://asciinema.org/a/bYYy1fyIOQ3hOY4lJ7L3WFcNb.svg
+   :target: https://asciinema.org/a/bYYy1fyIOQ3hOY4lJ7L3WFcNb
--- a/Documentation/applications/system/nxdiag/index.rst
+++ b/Documentation/applications/system/nxdiag/index.rst
@ -7,9 +7,12 @@ It also can be used to run a tests to verify that the vendor's tools are properl

 Its primary purpose is to gather information that can be used to debug problems and ease the process of reporting bugs for uninexperienced users.

-This tool uses a Python script (``apps/tools/host_sysinfo.py``) to gather information about the host system during build and a C
+This tool uses a Python script (``nuttx/tools/host_info_dump.py``) to gather information about the host system during build and a C
 program to gather information about the NuttX system and display all available information. For more information about the python
-script, check the command line options and code comments of ``host_sysinfo.py``.
+script, check the command line options and code comments of ``host_info_dump.py``.
+
+Alternatively, ``host_info`` target can be used without enabling nxdiag application and reflashing to get information about system. 
+Target can work after configuration step and prints information about the NuttX and host systems.

 .. note:: Nxdiag requires Python 3.6 or later. On Linux distributions, the ``distro`` Python module is
          recommended as it provides more accurate information about the host system.
--- a/Documentation/guides/building_nuttx_with_app_out_of_src_tree.rst
+++ b/Documentation/guides/building_nuttx_with_app_out_of_src_tree.rst
@ -0,0 +1,207 @@
+========================================================
+Building NuttX with Applications Outside the Source Tree
+========================================================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Building+NuttX+with+Applications+Outside+of+the+Source+Tree
+
+Q: Has anyone come up with a tidy way to build NuttX with board-specific pieces outside the source tree?
+========================================================================================================
+
+A: Here are four approaches:
+============================
+
+1. Make export
+--------------
+
+There is a make target called ``make export``. It will build NuttX, then bundle
+all of the header files, libraries, startup objects, and other build components
+into a ``.zip`` file. You can move that ``.zip`` file into any build environment
+you want. You can even build NuttX under a DOS CMD window.
+
+This ``make target`` is documented in the top-level 
+:doc:`Legacy README </introduction/resources>`. Search for ``Build Targets``
+
+
+1. Replace the apps/ Directory
+------------------------------
+
+You can replace the entire ``apps/`` directory. It is not a critical part of the
+OS. The ``apps/`` is simply provided for you to help with your application
+development. It should not dictate anything that you do.
+
+To use a different ``apps`` directory, simply execute ``make menuconfig`` in the
+top-level ``nuttx/`` directory and redefine ``CONFIG_APPS_DIR`` in your
+``.config`` file so that it points to a different, custom application directory.
+Note that ``CONFIG_APPS_DIR`` is a `relative` path from the top-level
+``nuttx/`` directory.
+
+You can copy any pieces that you like from the old ``apps/`` directory to your
+custom ``apps`` directory as necessary. This is documented in 
+the `NuttX Porting Guide <https://cwiki.apache.org/confluence/display/NUTTX/Porting+Guide>`_ 
+and in the `apps/README.md <https://github.com/apache/nuttx-apps/blob/master/README.md>`_ file.
+
+1. Extend the apps/ Directory
+-----------------------------
+
+If you like the random collection of stuff in the ``apps/`` directory but just
+want to expand the existing components with your own, external sub-directory,
+then there is an easy way to do that too: Create a symbolic link in the
+``apps/`` directory that redirects to your application sub-directory (or copy
+your code into a sub-directory of ``apps/``).
+
+.. image:: image/custom_app_dir_through_extension.png
+
+Makefile and Make.defs
+^^^^^^^^^^^^^^^^^^^^^^
+
+In order to be incorporated into the build, the directory that you link under
+the ``apps/`` directory should contain:
+
+1. A ``Makefile`` that supports the ``clean`` and ``distclean`` targets (see
+   other Makefiles for examples).
+2. A tiny ``Make.defs`` make file fragment that simply adds the build
+   directories to the variable ``CONFIGURED_APPS`` like:
+
+.. code-block:: shell
+
+   CONFIGURED_APPS += my_directory1 my_directory2
+
+Automatic Sub-directory Inclusion
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The ``apps/Makefile`` will always automatically check for the existence of
+sub-directories containing a ``Makefile`` and a ``Make.defs`` file. The
+``Makefile`` will be used only to support cleaning operations. The
+``Make.defs`` file provides the set of relative paths to directories to be
+built; these directories must also contain a ``Makefile``. That ``Makefile`` can
+build the sources and add the object files to the ``apps/libapps.a`` archive
+(see other Makefiles for examples). It should support the ``all``, ``install``,
+``context``, and ``depend`` targets.
+
+``apps/Makefile`` does not depend on any hard-coded lists of directories.
+Instead, it does a wildcard search to find all appropriate directories. This
+means that to install a new application, you simply have to copy the directory
+(or link it) into the ``apps/`` directory. If the new directory includes a
+``Makefile`` and a ``Make.defs`` file, then it will be automatically discovered
+and included in the build at ``make`` time.
+
+Kconfig
+^^^^^^^
+
+If the directory that you add also includes a ``Kconfig`` file, then it will be
+automatically included in the NuttX configuration system as well.
+``apps/Makefile`` uses a tool at ``apps/tools/mkkconfig.sh`` that dynamically
+builds the ``apps/Kconfig`` file at pre-configuration time.
+
+.. note::
+
+   The native Windows build will use a corresponding tool called
+   ``apps/tools/mkconfig.bat``.
+
+Install script
+^^^^^^^^^^^^^^
+
+You could, for example, create a script called ``install.sh`` that installs a
+custom application, configuration, and board-specific directory:
+
+1. Copy ``MyBoard`` directory to ``boards/MyBoard``.
+2. Add a symbolic link to ``MyApplication`` at ``apps/external``
+3. Configure NuttX:
+
+.. code-block:: shell
+
+   tools/configure.sh MyBoard:MyConfiguration
+
+Special ``apps/external`` Directory
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Use of the name ``apps/external`` is suggested because that name is included in
+the ``.gitignore`` file and will save you some nuisance when working with GIT.
+
+4. Contain the apps/ Directory
+------------------------------
+
+A simple, minimally invasive approach would be to contain the ``apps/`` GIT
+clone within your custom application directory. In this case, ``apps/`` would
+appear as a directory under your custom application directory instead of your
+application directories being inserted as sub-directories of ``apps/``. It may
+even be implemented as a sub-module of your custom application directory.
+
+.. image:: image/custom_app_dir_through_containment.png
+
+Kconfig and Makefile
+^^^^^^^^^^^^^^^^^^^^
+
+There are only a few minimal requirements of your custom application directory.
+It needs to have only its own ``Makefile`` and ``Kconfig`` file. That
+``Kconfig`` would need to include the ``apps/Kconfig``. The ``Makefile`` would
+similarly need to invoke the ``apps/Makefile`` for all of the relevant build
+targets. For example, the ``clean`` target:
+
+.. code-block:: shell
+
+  $(MAKE) -c apps clean TOPDIR=$(TOPDIR)
+
+Library Issues
+^^^^^^^^^^^^^^
+
+The contained directory will create and install a static library called
+``libapps($LIBEXT)`` in the ``nuttx/staging`` directory. Your custom logic must
+also appear in the ``nuttx/staging`` directory. Here are two ways that you might
+do that:
+
+1. **Merge with ``libapps($LIBEXT)``.**  
+   The custom application directory's ``Makefile`` could create and install the
+   final ``libapps($LIBEXT)`` in the ``nuttx/staging`` directory.
+   ``<custom-dir>/apps/libapps($LIBEXT)`` could merge its custom object files
+   with ``<custom-dir>/libapps($LIBEXT)`` and then re-install the library at
+   ``nuttx/staging``.
+2. **Use the EXTRA_LIBS Feature.**  
+   The build system supports two special make-related variables called
+   ``EXTRA_LIBS`` and ``EXTRA_LIBPATHS``. These may be defined in your
+   board-specific ``Make.defs`` file. ``EXTRA_LIBS`` provides the name of your
+   custom library. If you create ``<custom-dir>/libcustom.a``, then the value
+   of ``EXTRA_LIBS`` would be ``-lcustom`` and the value of ``EXTRA_LIBPATHS``
+   would be ``-L <custom-dir>`` (assuming the GNU ld linker).
+
+Relative Effort and Benefits
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The contained ``apps/`` directory approach requires some more effort than the
+extended ``apps/`` approach, but has the advantage that there will be no strange
+behavior due to issues with ``.gitignore`` and, hence, a cleaner user
+experience.
+
+Out-of-tree Builds
+^^^^^^^^^^^^^^^^^^
+
+This configuration also has the possibility of supporting out-of-tree builds
+using ``fusefs``. Suppose, for example, that you have a project directory with
+the contained ``apps/`` directory and, say, three platform build directories.
+Using ``fusefs``, you can overlay one of the platform build directories on top
+of the project directory. Then all files generated by the build will be written
+into the overlaid platform build directory. When the ``fusefs`` is torn down,
+the project directory will still be clean, and the build result will still be in
+the platform build directory. This can then be repeated for the other two
+platform build directories.
+
+In this case, you would probably also want to contain the ``nuttx/`` directory
+in the project directory as well so that the entire system is built out-of-tree.
+
+Hooking External Applications into the Configuration System
+-----------------------------------------------------------
+
+Suppose you have opted to extend the ``apps/`` directory with your custom
+external application directories and would also like to support configuration
+variables in your external application. No problem! Thanks to Sebastien Lorquet,
+any external application that you install into the ``apps/`` (whether via a
+symbolic link or via a directory copy) `will` be included in the NuttX
+configuration system.
+
+The top-level ``Kconfig`` file in the ``apps/`` directory is automatically
+generated based on the contents of each ``apps/`` sub-directory. If your
+installed sub-directory contains ``Kconfig``, ``Makefile``, and ``Make.defs``
+files, then it will be incorporated into the NuttX configuration system when the
+top-level ``Kconfig`` file is generated.
--- a/Documentation/guides/building_uclibcpp.rst
+++ b/Documentation/guides/building_uclibcpp.rst
@ -0,0 +1,84 @@
+=================
+Building uClibc++
+=================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629550 
+    and is probably outdated
+
+A version of `uClibc++ <http://cxx.uclibc.org/>`_ has been ported to NuttX and is available in the NuttX
+uClibc++ GIT repository at `Bitbucket.org <https://bitbucket.org/nuttx/uclibc/>`_ . This version of uClibc++ was
+adapted for NuttX by the RGMP team.
+
+This custom version of uClibc++ resides in the NuttX repository at:
+
+  https://bitbucket.org/nuttx/uclibc/
+
+rather than in the main NuttX source tree, due to licensing issues: NuttX is
+licensed under the permissive, modified BSD License; uClibc++, on the other
+hand, is licensed under the stricter GNU LGPL Version 3 license.
+
+General build instructions are available in the uClibc++ `README.txt <https://bitbucket.org/nuttx/uclibc/src/master/README.txt>`_ 
+file. Those instructions are not repeated here. This page documents specific 
+issues encountered when building this NuttX version of uClibc++ and how they 
+are resolved.
+
+Undefined Reference to ``_impure_ptr``
+======================================
+
+**Problem**
+
+When building uClibc++, you may encounter an undefined reference to
+``_impure_ptr`` similar to:
+
+.. code-block:: none
+
+   LD: nuttx
+   .../arm-none-eabi/lib/armv7e-m\libsupc++.a(vterminate.o): In function
+   `__gnu_cxx::__verbose_terminate_handler()`:
+   vterminate.cc:(.text._ZN9__gnu_cxx27__verbose_terminate_handlerEv+0xfc):
+   undefined reference to `_impure_ptr'
+
+**Solution**
+
+A definitive, elegant solution is not known, but the following workaround has
+proven to work:
+
+1. Locate the directory where you can find ``libsupc++``:
+
+   .. code-block:: console
+
+      arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -print-file-name=libsupc++.a
+
+2. Go to that directory and save a copy of ``vterminate.o`` (in case you need
+   it later):
+
+   .. code-block:: console
+
+      cd <the-directory-containing-libsupc++.a>
+      arm-none-eabi-ar.exe -x libsupc++.a vterminate.o
+
+3. Remove ``vterminate.o`` from the library. At build time, the uClibc++
+   package will provide a usable replacement:
+
+   .. code-block:: console
+
+      arm-none-eabi-ar.exe -d libsupc++.a vterminate.o
+
+4. At this point, NuttX should link with no problem. If you ever want to
+   restore the original ``vterminate.o`` to ``libsupc++.a``, you can do so
+   by running:
+
+   .. code-block:: console
+
+      arm-none-eabi-ar.exe rcs libsupc++.a vterminate.o
+
+After removing ``vterminate.o`` from the standard library, the
+uClibc++-provided ``vterminate.o`` becomes the active implementation and
+prevents references to ``_impure_ptr`` from arising during linkage.
+
+.. note::
+   Always exercise caution when modifying toolchain libraries. This
+   workaround is known to be effective but it replaces standard library
+   objects, which may have side effects in other toolchain usage scenarios.
--- a/Documentation/guides/custom_app_directories.rst
+++ b/Documentation/guides/custom_app_directories.rst
@ -0,0 +1,165 @@
+===========================================
+Custom Application Directories
+===========================================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Custom+Application+Directories
+
+Most people use the generic ``apps/`` directory with NuttX. That is convenient
+and well-documented. However, it should always be remembered that NuttX is a
+stand-alone, general-purpose OS and has **no dependency** on that "canned"
+application directory.
+
+This page shows how to create your own, custom application directory from
+scratch.
+
+Creating the Custom Application Directory
+=========================================
+
+Below is a simple example of the **minimum** custom application directory. It
+contains only three files: ``Makefile``, ``Kconfig``, and ``hello.c``.
+
+Makefile
+--------
+
+The custom application directory must include a ``Makefile`` that supports all
+of the make targets expected by the NuttX build system **and** must generate an
+archive called ``libapps.a`` in the top-level of the custom directory structure.
+The minimal required targets for the ``Makefile`` look like this:
+
+.. code-block:: shell
+
+    APPDIR = ${shell pwd}
+    
+    -include $(TOPDIR)/Make.defs
+    
+    # files
+    
+    CSRCS = hello.c
+    COBJS = hello.o
+    
+    ROOTDEPPATH = --dep-path .
+    
+    # Build targets
+    
+    all: libapps.a
+    .PHONY: dirlinks context preconfig depend clean clean_context distclean
+    .PRECIOUS: libapps$(LIBEXT)
+    
+    # Compile C Files
+    
+    $(COBJS): %$(OBJEXT): %.c
+    $(call COMPILE, $<, $@)
+    
+    # Add object files to the apps archive
+    
+    libapps.a: $(COBJS)
+    $(call ARCHIVE, libapps.a, $(COBJS))
+    
+    # Create directory links
+    
+    dirlinks:
+    
+    # Setup any special pre-build context
+    
+    context:
+    
+    # Setup any special pre-configuration context
+    
+    preconfig:
+    
+    # Make the dependency file, Make.deps
+    
+    depend: Makefile $(CSRCS)
+    $(Q) $(MKDEP) $(ROOTDEPPATH) "$(CC)" -- $(CFLAGS) -- $(SRCS) >Make.dep
+    
+    # Clean the results of the last build
+    
+    clean:
+    $(call CLEAN)
+    
+    # Remove the build context and directory links
+    
+    clean_context:
+    
+    # Restore the directory to its original state
+    
+    distclean: clean clean_context
+    $(call DELFILE, Make.dep)
+    
+    # Include dependencies
+
+    -include Make.dep
+    
+
+Kconfig
+-------
+
+A ``Kconfig`` file must be included, but it need not contain any meaningful
+configuration options. This file is where you can add application-specific
+configuration settings if desired. The minimal ``Kconfig`` might look like:
+
+.. code-block:: shell
+
+   # For a description of the syntax of this configuration file,
+   # see the file kconfig-language.txt in the NuttX tools repository.
+   #
+
+hello.c
+-------
+
+Your custom application must compile at least one source file to generate the
+required ``libapps.a`` archive. One of these source files must include the
+``main()`` entry point to the application. That main function (or similarly
+named entry point) is called after OS initialization completes.
+
+What this application initialization entry point does, how it interacts with 
+the rest of your application, and where the rest of you application code is 
+located is of no concern to the OS. Only this one entry point is needed.
+
+Below is a small "Hello, World!" example, where ``custom_main()`` is the
+application entry point:
+
+.. code-block:: c
+
+    #include <stdio.h>
+    
+    int custom_main(int argc, char *argv[])
+    {
+    printf("Hello, World!!\n");
+    return 0;
+    }
+
+Building with the Custom Application Directory
+==============================================
+
+In order to build with the new custom application directory, you need the
+following in your NuttX configuration:
+
+.. code-block:: shell
+
+   CONFIG_APPS_DIR="../custom-apps"
+   CONFIG_USER_ENTRYPOINT="custom_main"
+
+.. note::
+
+   You can only access the ``../custom-apps/Kconfig`` file if 
+   ``CONFIG_APPS_DIR`` is set to ``../custom-apps`` **before** running
+   ``make menuconfig``. If you start with an existing configuration, you may 
+   face a "chicken-and-egg" situation. One workaround is to manually edit
+   the ``.config`` file before running ``make menuconfig``.
+
+Alternatively, if you use the ``tools/configure.sh`` script, you can specify the
+custom-apps directory from the command line:
+
+.. code-block:: shell
+
+   tools/configure.sh -a ../custom_apps <board>:<config>
+
+Afterward, just build NuttX as you normally would. When you run the program that
+was built with your custom application directory, you should see:
+
+.. code-block:: shell
+
+   Hello, World!!
--- a/Documentation/guides/debugging_elf_loadable_modules.rst
+++ b/Documentation/guides/debugging_elf_loadable_modules.rst
@ -0,0 +1,84 @@
+==============================
+Debugging ELF Loadable Modules
+==============================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Debugging+ELF+Loadable+Modules
+
+Debugging ELF modules loaded in memory can be tricky because the load address
+in memory does not match the addresses in the ELF file. This challenge has long
+existed for debugging uClinux programs and Linux kernel modules; the same
+solution can be used with NuttX ELF files (and probably with NxFLAT modules as
+well). Below is a summary of one way to approach this:
+
+1. Get ELF Module Load Address
+==============================
+
+Put a change in ``nuttx/binfmt`` so that you print the address where the ELF
+text was loaded into memory.
+
+Turning on BINFMT debug (``CONFIG_DEBUG_BINFMT=y``) should give you the same
+information, although it may also provide more output than you really want.
+
+Alternatively, you could place a ``printf()`` at the beginning of your ``main()``
+function so that your ELF module can print its own load address. For example,
+the difference between the address of ``main()`` in your object file and the
+address of ``main()`` at run time reveals the actual load address.
+
+2. Make the ELF Module Wait for You
+===================================
+
+Insert an infinite loop in the ``main()`` routine of your ELF program. For
+example:
+
+.. code-block:: c
+
+    volatile bool waitforme;
+    int main (int arc, char **argv)
+    {
+        while (!waitforme);
+        ...
+
+When you start the ELF program, you will see where it was loaded in memory, and
+the ELF program will remain stuck in the infinite loop. It will continue to
+wait for ``waitforme`` to become true before proceeding.
+
+3. Start the Debugger
+=====================
+
+Start the debugger, connect to the GDB server, and halt the program. If your
+debugger is well-behaved, it should stop at the infinite loop in ``main()``.
+
+4. Load Offset Symbols
+======================
+
+Load symbols using the offset where the ELF module was loaded:
+
+.. code-block:: shell
+
+   (gdb) add-symbol-file <myprogram> <load-address>
+
+Here, ``<myprogram>`` is your ELF file containing symbols, and
+``<load-address>`` is the address where the program text was actually loaded (as
+determined above). Single-step a couple of times and confirm that you are in the
+infinite loop.
+
+5. And Debug
+============
+
+Set ``waitforme`` to a non-zero value. Execution should exit the infinite loop,
+and now you can debug the ELF program loaded into RAM in the usual way.
+
+An Easier Way?
+==============
+
+There might be an alternative that allows you to step into the ELF module
+without modifying the code to include the ``waitforme`` loop. You could place a
+breakpoint on the OS function ``task_start()``. That function runs before your
+ELF program starts, so you should be able to single-step from the OS code
+directly into your loaded ELF application—no changes to the ELF application
+required.
+
+When you step into the application's ``main()``, you have the relocated address
+of ``main()`` and can use that address (see step #1) to compute the load offset.
--- a/Documentation/guides/fully_linked_elf.rst
+++ b/Documentation/guides/fully_linked_elf.rst
@ -0,0 +1,538 @@
+===============================
+ELF Programs – No Symbol Tables
+===============================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629542
+
+You can easily extend the firmware in your released, embedded system using ELF  
+programs provided via a file system (for example, an SD card or downloaded into  
+on-board SPI FLASH). In order to support such post-release updates, your  
+released firmware would have to support execution of fully linked, relocatable  
+ELF programs loaded into RAM (see, for example, ``apps/examples/elf``).
+
+The files shown in this Wiki page can be downloaded `here <https://cwiki.apache.org/confluence/download/attachments/139629402/elfprog-nosymtab.tar.gz?version=1&modificationDate=1576735520000&api=v2>`_.
+
+Alan Carvalho de Assis has also made a video based on this example in the  
+YouTube `NuttX Channel <https://www.youtube.com/watch?v=oL6KAgkTb8M>`_.
+
+Creating the Export Package
+===========================
+
+At the time that you release the firmware, you should create and save an  
+export package. The export package is all that you need to create  
+post-release, add-on modules for your embedded system. Let's illustrate this  
+using the ``STM32F4-Discovery`` networking ``NSH`` configuration with the  
+``STM32F4DIS-BB`` baseboard. (This demonstration assumes that you also have  
+support for some externally modifiable media in the board configuration, such  
+as removable media like an SD card, or a USB FLASH stick, an internal file  
+system remotely accessible via USB MSC, FTP, or any remote file system (NFS).  
+The networking ``NSH`` configuration uses the SD card on the STM32 baseboard  
+for this demonstration. Other ``NSH`` configurations could be used, provided  
+that you supply the necessary file system support in some fashion.)
+
+(No baseboard? You can add file system support to the basic ``STM32F4-Discovery``  
+board by following these instructions: 
+`USB FLASH drive <https://www.youtube.com/watch?v=5hB5ZXpRoS4>`_ 
+or `SD card <https://www.youtube.com/watch?v=H28t4RbOXqI>`_.)
+
+.. code-block:: shell
+
+   $ make distclean
+   $ tools/configure.sh -c stm32f4discovery:netnsh
+   $ make menuconfig
+
+Your released firmware would have to have been built with a few important  
+configuration settings:
+
+1. Disable networking (Only because it is not needed in this example):
+
+.. code-block:: shell
+
+   # CONFIG_NET is not set
+
+2. Enable basic ELF binary support with no built-in symbol table support:
+
+.. code-block:: shell
+
+   CONFIG_ELF=y
+   CONFIG_LIBC_EXECFUNCS=y
+   # CONFIG_EXECFUNCS_HAVE_SYMTAB is not set
+
+3. Enable PATH variable support:
+
+.. code-block:: shell
+
+   CONFIG_BINFMT_EXEPATH=y
+   CONFIG_PATH_INITIAL="/bin"
+   # CONFIG_DISABLE_ENVIRON not set
+
+4. Enable execution of ELF files from the ``NSH`` command line:
+
+.. code-block:: shell
+
+   CONFIG_NSH_FILE_APPS=y
+
+.. note::
+
+   You must enable some application that uses ``printf()``. This is necessary  
+   to assure that the symbol ``printf()`` is included in the base system.  
+   Here we assume that you include the "Hello, World!" example from  
+   ``apps/examples/hello``:
+
+.. code-block:: shell
+
+       CONFIG_EXAMPLES_HELLO=y
+
+Then we can build the NuttX firmware image and the export package:
+
+.. code-block:: shell
+
+   $ make
+   $ make export
+
+When ``make export`` completes, you will find a ZIP'ed package in the top-level  
+NuttX directory called ``nuttx-export-x.y.zip`` (for version ``x.y``). The  
+version is determined by the ``.version`` file in the same directory. The  
+content of this ZIP file is the following directory structure:
+
+.. code-block:: shell
+
+   nuttx-export-x.x
+    |- arch/
+    |- build/
+    |- include/
+    |- libs/
+    |- startup/
+    |- System.map
+    `- .config
+
+The Add-On Build Directory
+==========================
+
+In order to create the add-on ELF program, you will need (1) the export  
+package, (2) the program build ``Makefile``, (3) a linker script used by the  
+``Makefile``, and (4) a Bash script to create a linker script. That  
+``Makefile`` and Bash Script are discussed in the following paragraphs.
+
+.. note::
+
+   These example files implicitly assume a GNU tool chain is used and, in at  
+   least one place, that the target is an ARMv7-M platform. A non-GNU tool  
+   chain would probably require a significantly different ``Makefile`` and  
+   linker script. There is at least one ARMv7-M specific change that would  
+   have to be made for other platforms in the script that creates the linker  
+   script (``mkdefines.sh``).
+
+Hello Example
+=============
+
+To keep things manageable, let's use a concrete example. Suppose the ELF  
+program that we wish to add to the release code is the single source file  
+``hello.c``:
+
+.. code-block:: c
+
+   #include <stdio.h>
+   
+   int main(int argc, char **argv)
+   {
+     printf("Hello from Add-On Program!\n");
+     return 0;
+   }
+
+Let's say that we have a directory called ``addon`` and it contains the  
+``hello.c`` source file, a ``Makefile`` that will create the ELF program, and a  
+Bash script called ``mkdefines.sh`` that will create a linker script.
+
+Building the ELF Program
+========================
+
+The first step in creating the ELF program is to unzip the Export Package. We  
+start with our ``addon`` directory containing the following:
+
+.. code-block:: shell
+
+   $ cd addon
+   $ ls
+   gnu-elf.ld hello.c Makefile mkdefines.sh nuttx-export-7.25.zip
+
+Where:
+
+- ``gnu-elf.ld`` is the linker script.  
+- ``hello.c`` is our example source file.  
+- ``Makefile`` will build our ELF program and symbol table.  
+- ``mksymtab.h`` is the Bash script that will create the symbol table for the  
+  ELF program.  
+- ``nuttx-export-7.25.zip`` is the Export Package for NuttX-7.25.
+
+We unzip the Export Package like:
+
+.. code-block:: shell
+
+   $ unzip nuttx-export-7.25.zip
+
+Then we have a new directory called ``nuttx-export-7.25`` that contains all of  
+the content from the released NuttX code that we need to build the ELF  
+program.
+
+The Makefile
+============
+
+The ELF program is created simply as:
+
+.. code-block:: shell
+
+   $ make
+
+This uses the following ``Makefile`` to generate several files:
+
+- ``hello.o``: The compiled ``hello.c`` object.  
+- ``hello.r``: A "partially linked" ELF object that still has undefined  
+  symbols.  
+- ``hello``: The fully linked, relocatable ELF program.  
+- ``linker.ld``: A linker script created by ``mkdefines.sh``.
+
+Only the resulting ``hello`` is needed.
+
+Below is the ``Makefile`` used to create the ELF program:
+
+.. code-block:: shell
+
+   include nuttx-export-7.25/build/Make.defs
+   
+   # Long calls are need to call from RAM into FLASH
+   
+   ARCHCFLAGS += -mlong-calls
+   ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
+   ARCHOPTIMIZATION = -Os -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+   ARCHINCLUDES = -I. -isystem  nuttx-export-7.25/include
+   
+   CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHINCLUDES) -pipe
+   
+   CROSSDEV = arm-none-eabi-
+   CC = $(CROSSDEV)gcc
+   LD = $(CROSSDEV)ld
+   STRIP = $(CROSSDEV)strip --strip-unneeded
+   
+   # Setup up linker command line options
+   
+   LDRELFLAGS = -r
+   
+   LDELFFLAGS = -r -e main
+   LDELFFLAGS += -T defines.ld -T gnu-elf.ld
+   
+   # This might change in a different environment
+   
+   OBJEXT ?= .o
+   
+   # This is the generated ELF program
+   
+   BIN = hello
+   REL = hello.r
+   
+   # These are the sources files that we use
+   
+   SRCS = hello.c
+   OBJS = $(SRCS:.c=$(OBJEXT))
+   
+   # Build targets
+   
+   all: $(BIN)
+   .PHONY: clean
+   
+   $(OBJS): %$(OBJEXT): %.c
+   $(CC) -c $(CFLAGS) -o $@ $<
+   
+   System.map: nuttx-export-7.25/System.map
+   cat nuttx-export-7.25/System.map | sed -e "s/\r//g" >System.map
+   
+   $(REL): $(OBJS)
+   $(LD) $(LDRELFLAGS) -o $@ $<
+   
+   defines.ld: System.map $(REL)
+   ./mkdefines.sh System.map "$(REL)" >defines.ld
+   
+   $(BIN): defines.ld $(REL)
+   $(LD) $(LDELFFLAGS) -o $@ $(REL)
+   $(STRIP) $(REL)
+   
+   clean:
+   rm -f $(BIN)
+   rm -f $(REL)
+   rm -f defines.ld
+   rm -f System.map
+   rm -f *.o
+
+The Linker Script
+=================
+
+Two linker scripts are used. One is a normal file (we'll call it the main  
+linker script), and the other, ``defines.ld``, is created on-the-fly as  
+described in the next section.
+
+The main linker script, ``gnu-elf.ld``, contains the following:
+
+.. code-block:: shell
+
+   SECTIONS
+   {
+   .text 0x00000000 :
+      {
+         _stext = . ;
+         *(.text)
+         *(.text.*)
+         *(.gnu.warning)
+         *(.stub)
+         *(.glue_7)
+         *(.glue_7t)
+         *(.jcr)
+         _etext = . ;
+      }
+   
+   .rodata :
+      {
+         _srodata = . ;
+         *(.rodata)
+         *(.rodata1)
+         *(.rodata.*)
+         *(.gnu.linkonce.r*)
+         _erodata = . ;
+      }
+   
+   .data :
+      {
+         _sdata = . ;
+         *(.data)
+         *(.data1)
+         *(.data.*)
+         *(.gnu.linkonce.d*)
+         _edata = . ;
+      }
+   
+   .bss :
+      {
+         _sbss = . ;
+         *(.bss)
+         *(.bss.*)
+         *(.sbss)
+         *(.sbss.*)
+         *(.gnu.linkonce.b*)
+         *(COMMON)
+         _ebss = . ;
+      }
+   
+      /* Stabs debugging sections.    */
+   
+      .stab 0 : { *(.stab) }
+      .stabstr 0 : { *(.stabstr) }
+      .stab.excl 0 : { *(.stab.excl) }
+      .stab.exclstr 0 : { *(.stab.exclstr) }
+      .stab.index 0 : { *(.stab.index) }
+      .stab.indexstr 0 : { *(.stab.indexstr) }
+      .comment 0 : { *(.comment) }
+      .debug_abbrev 0 : { *(.debug_abbrev) }
+      .debug_info 0 : { *(.debug_info) }
+      .debug_line 0 : { *(.debug_line) }
+      .debug_pubnames 0 : { *(.debug_pubnames) }
+      .debug_aranges 0 : { *(.debug_aranges) }
+   }
+
+Creating the ``defines.ld`` Linker Script
+=========================================
+
+The additional linker script ``defines.ld`` is created through a three-step  
+process:
+
+1. The ``Makefile`` generates a partially linked ELF object, ``hello.r``.  
+2. The ``Makefile`` then invokes the ``mkdefines.sh`` script, which generates  
+   the ``defines.ld`` linker script that provides values for all of the  
+   undefined symbols.  
+3. Finally, the ``Makefile`` produces the fully linked, relocatable ``hello``  
+   ELF object using the ``defines.ld`` linker script.
+
+Below is the version of ``mkdefines.sh`` used in this demo:
+
+.. code-block:: bash
+
+   #!/bin/bash
+   
+   usage="Usage: $0 <system-map> <relprog>"
+   
+   # Check for the required path to the System.map file
+   
+   sysmap=$1
+   if [ -z "$sysmap" ]; then
+   echo "ERROR: Missing <system-map>"
+   echo ""
+   echo $usage
+   exit 1
+   fi
+   
+   # Check for the required partially linked file
+   
+   relprog=$2
+   if [ -z "$relprog" ]; then
+   echo "ERROR: Missing <program-list>"
+   echo ""
+   echo $usage
+   exit 1
+   fi
+   
+   # Verify the System.map and the partially linked file
+   
+   if [ ! -r "$sysmap" ]; then
+   echo "ERROR:  $sysmap does not exist"
+   echo ""
+   echo $usage
+   exit 1
+   fi
+   
+   if [ ! -r "$relprog" ]; then
+   echo "ERROR:  $relprog does not exist"
+   echo ""
+   echo $usage
+   exit 1
+   fi
+   
+   # Extract all of the undefined symbols from the partially linked file and create a
+   # list of sorted, unique undefined variable names.
+   
+   varlist=`nm $relprog | fgrep ' U ' | sed -e "s/^[ ]*//g" | cut -d' ' -f2 | sort - | uniq`
+   
+   # Now output the linker script that provides a value for all of the undefined symbols
+   
+   for var in $varlist; do
+   map=`grep " ${var}$" ${sysmap}`
+   if [ -z "$map" ]; then
+      echo "ERROR:  Variable $var not found in $sysmap"
+      echo ""
+      echo $usage
+      exit 1
+   fi
+   
+   varaddr=`echo ${map} | cut -d' ' -f1`
+   echo "${var} = 0x${varaddr} | 0x00000001;"
+   done
+
+This script uses the ``nm`` utility to find all of the undefined symbols in the  
+ELF object, then searches for the address of each undefined symbol in the  
+``System.map`` that was created when the released firmware was built. Finally,  
+it uses the symbol name and the symbol address to create each symbol table  
+entry.
+
+.. note::
+
+   - For the ARMv7-M architecture, bit 0 of the address must be set to indicate  
+     thumb mode. If you are using a different architecture that requires  
+     normal aligned addresses, you will need to change the following line by  
+     eliminating the ORed value:
+
+   .. code-block:: shell
+
+         echo "${var} = 0x${varaddr} | 0x00000001;"
+
+   - If the new ELF module uses a symbol that is not provided in the base  
+     firmware and, hence, not included in the ``System.map`` file, this script  
+     will fail. In that case, you will need to provide the missing logic  
+     within the ELF program itself, if possible.  
+
+   - The technique as described here is only valid in the FLAT build mode. It  
+     could probably also be extended to work in the PROTECTED mode by  
+     substituting ``User.map`` for ``System.map``.
+
+Here is an example ``defines.ld`` created by ``mkdefines.sh``:
+
+.. code-block:: shell
+
+   printf = 0x0800aefc | 0x00000001 ;
+
+Replacing an NSH Built-In Function
+==================================
+
+Files can be executed by ``NSH`` from the command line by simply typing the  
+name of the ELF program. This requires:
+
+1. That the feature be enabled with``CONFIG_NSH_FILE_APP=y``  
+2. That support for the PATH variable is enabled (``CONFIG_BINFMT_EXEPATH=y`` and  
+   ``CONFIG_PATH_INITIAL`` set to the mount point of the file system that  
+   may contain ELF programs).
+
+Suppose, for example, I have a built-in application called ``hello``. Before  
+installing the new replacement ``hello`` ELF program in the file system, this  
+is the version of ``hello`` that ``NSH`` will execute:
+
+.. code-block:: shell
+
+   nsh> hello
+   Hello, World!
+   nsh>
+
+In the above configuration, ``NSH`` will first attempt to run the program called  
+``hello`` from the file system. This will fail because we have not yet placed  
+our custom ``hello`` ELF program in the file system. So instead, ``NSH`` will  
+fall back and execute the built-in application called ``hello``.  
+
+In this way, any command known to ``NSH`` can be replaced by an ELF program  
+installed in a mounted file system directory that is found via the PATH  
+variable.
+
+Now suppose that we do add our custom ``hello`` to the file system. When  
+``NSH`` attempts to run the program called ``hello`` from the file system, it  
+will run successfully. The built-in version will be ignored. It has been  
+replaced with the version in the file system:
+
+.. code-block:: shell
+
+   nsh> mount -t vfat /dev/mmcsd0 /bin
+   nsh> hello
+   Hello from Add-On Program!
+   nsh>
+
+Version Dependency
+==================
+
+.. note::
+
+   This technique generates ELF programs using fixed addresses from the  
+   ``System.map`` file of a versioned release. The generated ELF programs can  
+   only be used with that specific firmware version. A crash will most likely  
+   result if used with a different firmware version, because the addresses  
+   from the ``System.map`` will not match the addresses in a different version  
+   of the firmware.
+
+The alternative approach using :doc:`Symbol Tables <fully_linked_elf>` is more 
+or less version independent.
+
+Tightly Coupled Memories
+========================
+
+Most MCUs based on ARMv7-M family processors support some kind of Tightly  
+Coupled Memory (TCM). These TCMs have somewhat different properties for  
+specialized operations. Depending on the bus matrix of the processor, you may  
+not be able to execute programs from TCM. For instance, the ``STM32 F4``  
+supports Core Coupled Memory (CCM), but since it is tied directly to the D-bus,  
+it cannot be used to execute programs! On the other hand, the ``STM32F3`` has a  
+CCM that is accessible to both the D-Bus and the I-Bus, in which case it  
+should be possible to execute programs from this TCM.
+
+.. image:: ./image/system_arch_stm32f42xx_and_f43xx.png
+
+.. image:: ./image/system_arch_stm32f303xBC_and_f358xC.png
+
+When ELF programs are loaded into memory, the memory is allocated from the  
+heap via a standard memory allocator. By default with the ``STM32 F4``, the  
+CCM is included in ``HEAP`` and will typically be allocated first. If CCM  
+memory is allocated to hold the ELF program, a hard-fault will occur  
+immediately when you try to execute the ELF program in memory.
+
+Therefore, it is necessary on ``STM32 F4`` platforms to include the following  
+configuration setting:
+
+.. code-block:: shell
+
+   CONFIG_STM32_CCMEXCLUDE=y
+
+With that setting, the CCM memory will be excluded from the heap, and so will  
+never be allocated for ELF program memory.
--- a/Documentation/guides/image/custom_app_dir_through_containment.png
+++ b/Documentation/guides/image/custom_app_dir_through_containment.png
--- a/Documentation/guides/image/custom_app_dir_through_extension.png
+++ b/Documentation/guides/image/custom_app_dir_through_extension.png
--- a/Documentation/guides/image/system_arch_stm32f303xBC_and_f358xC.png
+++ b/Documentation/guides/image/system_arch_stm32f303xBC_and_f358xC.png
--- a/Documentation/guides/image/system_arch_stm32f42xx_and_f43xx.png
+++ b/Documentation/guides/image/system_arch_stm32f42xx_and_f43xx.png
--- a/Documentation/guides/index.rst
+++ b/Documentation/guides/index.rst
@ -56,4 +56,18 @@ Guides
  signal_events_interrupt_handlers.rst  
  signaling_sem_priority_inheritance.rst
  smaller_vector_tables.rst
-  port.rst
+  port.rst
+  updating_release_system_elf.rst
+  partially_linked_elf.rst
+  fully_linked_elf.rst
+  building_nuttx_with_app_out_of_src_tree.rst
+  building_uclibcpp.rst
+  custom_app_directories.rst
+  debugging_elf_loadable_modules.rst
+  multiple_nsh_sessions.rst
+  nsh_network_link_management.rst
+  ram_rom_disks.rst
+  reading_can_msgs.rst
+  remove_device_drivers_nsh.rst
+  rust.rst
+
--- a/Documentation/guides/multiple_nsh_sessions.rst
+++ b/Documentation/guides/multiple_nsh_sessions.rst
@ -0,0 +1,86 @@
+=====================
+Multiple NSH Sessions
+=====================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Multiple+NSH+Sessions
+
+Q:  
+  I would like to run the NuttShell on multiple serial ports, but haven't
+  figured it out yet; can you point me in the right direction?
+
+A:  
+  Easy. Don't use ``apps/examples/nsh_main.c``. Create your own main function
+  something like this (with all error handling omitted for simplicity). By the
+  way, this is all standard POSIX stuff that you can get detailed information
+  about by just Googling `dup2` or maybe `I/O redirection`:
+
+.. code-block:: c
+
+   int my_main(int argc, char **argv)
+   {
+     const char *tty = argv[1];
+     int fd = open(tty, O_RDWR);
+     (void)dup2(fd, 0);
+     (void)dup2(fd, 1);
+     (void)dup2(fd, 2);
+     close(fd);
+     ...
+   }
+
+And the rest is just like the original ``nsh_main()`` function (in fact,
+perhaps the existing ``nsh_main()`` function could be optionally extended to
+accept a console device string?). Then you can start a new NSH session on any
+TTY like:
+
+.. code-block:: none
+
+   nsh> mynsh /dev/ttyS2 &
+
+This should cause a new NSH session to appear on ``ttyS2``. That session will
+persist until you do the following from the new session:
+
+.. code-block:: none
+
+   nsh> exit
+
+Then the new session, i.e., ``my_main()`` will exit.
+
+If you were to do something like:
+
+.. code-block:: none
+
+   nsh> mynsh /dev/console
+
+then you would get nested NSH sessions on the same console. The first session
+would halt and wait for the second session to take control of the console until
+it exits. Then the first session will take over console again.
+
+NuTTY
+=====
+
+In a previous discussion, there was talk about implementing the moral equivalent
+of getty in NuttX (of course, it would be called "nutty"). A simple
+implementation of nutty would work like this:
+
+1. It would wait on ``poll()`` on every (configured) serial device.
+2. Whenever it is awakened, it would start something like ``my_main()`` above
+   on the active serial port.
+3. NSH has an option to enable logins, but it would be better to remove the
+   existing login information from NSH and centralize it in nutty.
+
+That way, you could connect to any TTY, hit enter, and you would get an NSH
+session. Hmm... it is not clear how nutty would get the TTY back after the
+session is closed. That part may require some additional thought.
+
+Other Ideas
+===========
+
+There are other ways to get multiple NSH sessions:
+
+- Telnet already supports multiple sessions.
+- Implement the existing NSH as an ELF program, then you can get multiple NSH
+  sessions with ``posix_spawn`` by simply redirecting I/O.
+- Using the tiny NxWM window managers, multiple NSH windows are already
+  supported.
--- a/Documentation/guides/nsh_network_link_management.rst
+++ b/Documentation/guides/nsh_network_link_management.rst
@ -0,0 +1,122 @@
+===========================
+NSH Network Link Management
+===========================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/NSH+Network+Link+Management
+
+In the past, if the network was not connected when NuttX started, two problems
+could arise:
+
+1. It could take a very long time for the NSH prompt to appear because of the
+   sequential initialization (for example, when the network cable is not
+   connected).
+2. After NuttX came up, installing the network cable would not enable the
+   network; the only way to recover networking was to connect the cable and
+   reset the board.
+
+Network link management capability has now been added to NSH to address these
+problems.
+
+Configuration Options
+=====================
+
+A simple feature can be enabled to move network initialization to a separate
+thread so that it is no longer performed sequentially. With this feature, the
+network bringup occurs asynchronously, and the NSH prompt appears immediately
+(although the network may not be available until some time later). That feature
+is enabled with the following setting and is the first prerequisite for the full
+NSH link management feature:
+
+- ``CONFIG_NSH_NETINIT_THREAD``. Refer to the help text in the Kconfig file for
+  this option (``apps/nshlib/Kconfig``). Additional information about this
+  setting is included there.
+
+The logic that implements NSH network management is provided in
+``apps/nshlib/nsh_netinit.c``. The behavior of that logic depends on multiple
+configuration settings. First, there are some additional prerequisites that
+must be satisfied:
+
+- ``CONFIG_NETDEV_PHY_IOCTL``  
+  Enable PHY IOCTL commands in the Ethernet device driver. Special IOCTL
+  commands must be provided by the Ethernet driver to support certain PHY
+  operations needed for link management. These operations are not complex and
+  are implemented for Atmel SAM4/4, SAMA5 families, and for the STMicro STM32.
+  See ``nuttx/arch/arm/src/sam34/sam_emac.c``,
+  ``nuttx/arch/arm/src/sam34/sam_emaca.c``, ``sam_emacb.c``, and ``sam_gmac.c``,
+  and ``nuttx/arch/arm/src/stm32/stm32_eth.c``.
+- ``CONFIG_ARCH_PHY_INTERRUPT``  
+  This is not a user-selectable option. Rather, it is set when selecting a board
+  that supports PHY interrupts. In most architectures, the PHY interrupt is not
+  directly associated with the Ethernet driver. Instead, the PHY interrupt is
+  provided through some board-specific GPIO, and the board-specific logic must
+  provide support for that GPIO interrupt. Specifically, the board logic must:
+  
+  1. Provide the function ``arch_phy_irq()`` as described and prototyped in
+     ``nuttx/include/nuttx/arch.h``.
+  2. Select ``CONFIG_ARCH_PHY_INTERRUPT`` in the board configuration file to
+     advertise that ``arch_phy_irq()`` is supported.
+  
+  Examples can be found at:
+  
+  - ``nuttx/boards/arm/sama5/sama5d3x-ek/src/sam_ethernet.c``
+  - ``nuttx/boards/arm/sama5/sama5d3-xplained/src/sam_ethernet.c``
+  - ``nuttx/boards/arm/sama5/sama5d4-ek/src/sam_ethernet.c``
+- Other requirements: UDP support must be enabled (``CONFIG_NET_UDP``), and
+  signals must not be disabled (``CONFIG_DISABLE_SIGNALS``).
+
+With all these prerequisites in place, NSH network management can be enabled on
+the NSH network initialization thread by selecting these additional options:
+
+- ``CONFIG_NSH_NETINIT_MONITOR``  
+  By default, the network initialization thread brings up the network (or
+  fails while trying) then exits, freeing all resources it used. If this option
+  is selected, however, the network initialization thread will persist
+  indefinitely to monitor the network status. Should the network go down (for
+  example, if the cable is removed), the thread will monitor the link status
+  and attempt to bring the network back up. In this scenario, the resources
+  required for network initialization are never released.
+
+If the network monitor is selected, additional options control its behavior:
+
+- ``CONFIG_NSH_NETINIT_SIGNO``  
+  The network monitor logic receives signals when there is a change in link
+  status. This setting can be used to customize the signal number to avoid
+  conflicts.
+- ``CONFIG_NSH_NETINIT_RETRYMSEC``  
+  When the network is down, the initialization thread will periodically attempt
+  to bring the network back up. Because this can be time-consuming, the retry
+  operation is performed only at the interval specified by this value, in
+  milliseconds.
+- ``CONFIG_NSH_NETINIT_THREAD_STACKSIZE``  
+  The stack size for the network initialization thread.
+- ``CONFIG_NSH_NETINIT_THREAD_PRIORITY``  
+  The network initialization thread priority.
+
+Overview of the Operation
+=========================
+
+Below is a summary of how the NSH management thread operates:
+
+1. During initialization, the thread opens a UDP socket for IOCTL operations
+   and connects a signal handler.
+2. It enters a loop. At the beginning of each loop iteration, the thread
+   uses an IOCTL command to register (or re-register) with the Ethernet device
+   to receive a signal whenever the PHY reports a link up or link down
+   interrupt. Re-registration is necessary because the notification disarms
+   after each PHY interrupt.
+3. The thread reads the link status from both the PHY and the Ethernet device.
+   If they disagree, the network monitor uses an IOCTL command to bring the
+   Ethernet driver up or down to match the current state of the network. If the
+   network is lost, the monitor brings the Ethernet driver down; if the network
+   is regained, the monitor brings the Ethernet driver back up and re-establishes
+   the connection.
+4. If the PHY and the Ethernet driver agree on the link state, no action is
+   performed.
+5. At the end of the loop, the network monitor waits for a PHY interrupt or a
+   timeout. When either occurs, control returns to the top of the loop, and the
+   process repeats.
+6. If a PHY interrupt happens, a signal is delivered to the task and handled by
+   the network monitor’s signal handler, which posts a semaphore to immediately
+   re-awaken the network monitor from its wait.
--- a/Documentation/guides/partially_linked_elf.rst
+++ b/Documentation/guides/partially_linked_elf.rst
@ -0,0 +1,434 @@
+=================================
+ELF Programs – With Symbol Tables
+=================================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629543
+
+Updating a Release System with ELF Programs – With Symbol Tables
+================================================================
+
+You can easily extend the firmware in your released, embedded system using
+ELF programs provided via a file system. For example, an SD card or, perhaps,
+downloaded into on-board SPI FLASH.
+
+In order to support such post-release updates, your released firmware must
+support execution of ELF programs loaded into RAM and symbol tables also
+provided via the file system (see `apps/examples/elf`).
+
+The files shown in this Wiki page can be downloaded 
+`here <https://cwiki.apache.org/confluence/download/attachments/139629402/elfprog-wsymtab.tar.gz?version=1&modificationDate=1576735523000&api=v2>`_
+
+Creating a Symbol Table
+=======================
+
+There are several ways to create an application symbol table. Only two are
+compatible with the example provided here:
+
+1. **Board-specific Bring-up Logic**
+   Build a symbol table into the base firmware and add it to your
+   board-specific bring-up logic. This technique is typically used in kernel
+   mode with ``CONFIG_USER_INITPATH=y``.
+
+   In this setup, the system does not initialize using a standard C call like
+   ``nsh_main()``. Instead, it starts with an ``init`` ELF program, similar to
+   how Linux initializes. The configuration option
+   ``CONFIG_EXECFUNCS_SYMTAB_ARRAY`` initializes the system with a minimal set
+   of symbols required by the ``init`` program. Once initialized, the ``init``
+   program would typically call ``boardctl()`` to put the final symbol table in
+   place.
+
+   To enable this method, you must:
+
+   - Set ``CONFIG_EXECFUNCS_HAVE_SYMTAB=y`` in your configuration.
+   - Provide a symbol table with the global name ``CONFIG_EXECFUNCS_SYMTAB_ARRAY`` with the variable name ``CONFIG_EXECFUNCS_NSYMBOLS_VAR`` that holds the number of symbol entries. The default symbol table name is ``g_symtab``.
+
+   In this example, let's illustrate this using an STM32F4-Discovery 
+   configuration. We will assume that you have modified the
+   ``boards/arm/stm32/stm32fdiscovery/src/stm32_bringup.c`` file, adding the
+   following:
+
+   .. code-block:: c
+
+      #include <stdio.h>
+      #include <nuttx/binfmt/symtab.h>
+
+      const struct symtab_s g_symtab[] = {
+          {"printf", (FAR void *)printf}
+      };
+
+      int g_nsymbols = 1;
+
+   This is a simple symbol table containing only the symbol string "printf,"
+   whose value is the address of the function ``printf()``.
+
+   There is, of course, a lot more that could be said about generating symbol
+   tables. NuttX provides specialized tools in the ``tools/`` directory and
+   instructions elsewhere for generating more extensive symbol tables. However,
+   this example keeps things simple to focus on the core functionality.
+
+2. **Application Logic**
+   Alternatively, the symbol table can be provided dynamically by the
+   application itself, using the ``boardctl()`` system interface. The specific
+   ``boardctl()`` command to use is ``BOARDIOC_APP_SYMTAB``. This command
+   provides the symbol table in the same way as the board-specific logic but
+   allows for application-level control.
+
+   To use this approach, you need to:
+   - Enable the configurations ``CONFIG_LIB_BOARDCTL=y`` and ``CONFIG_BOARDCTL_APP_SYMTAB=y``.
+   - Include application logic to provide the symbol table. If ``CONFIG_EXAMPLES_NSH_SYMTAB=y`` is set, NSH can handle this automatically.
+
+Export Package
+==============
+
+At the time of firmware release, you should create and save an export package.
+This export package contains all the necessary files required to create
+post-release add-on modules for your embedded system.
+
+For demonstration purposes, we use the STM32F4-Discovery with the network NSH
+configuration. This setup assumes that you have the STM32F4DIS-BB baseboard.
+The demonstration also requires support for externally modifiable media, such
+as:
+
+- Removable media, like an SD card or USB flash drive.
+- An internal file system remotely accessible via USB MSC, FTP, or other
+  protocols.
+- A remote file system, such as NFS.
+
+In this demonstration, the networking NSH configuration uses the SD card on
+the STM32 baseboard. Other NSH configurations can also be used, provided they
+supply the necessary file system support.
+
+(No baseboard? You can add file system support to the basic ``STM32F4-Discovery``  
+board by following these instructions: 
+`USB FLASH drive <https://www.youtube.com/watch?v=5hB5ZXpRoS4>`_ 
+or `SD card <https://www.youtube.com/watch?v=H28t4RbOXqI>`_.)
+
+Example for STM32F4-Discovery:
+
+.. code-block:: shell
+
+   $ make distclean
+   $ tools/configure.sh -c stm32f4discovery:netnsh
+   $ make menuconfig
+
+Required configurations:
+
+- Disable networking: ``# CONFIG_NET is not set``
+- Enable ELF binary support: ``CONFIG_ELF=y``, ``CONFIG_LIBC_EXECFUNCS=y``,
+  ``CONFIG_EXECFUNCS_HAVE_SYMTAB=y``, ``CONFIG_EXECFUNCS_SYMTAB_ARRAY="g_symtab"`` and
+  ``CONFIG_EXECFUNCS_NSYMBOLS_VAR="g_nsymbols"``
+- Enable PATH variable support: ``CONFIG_BINFMT_EXEPATH=y``,
+  ``CONFIG_PATH_INITIAL="/bin"``
+- Enable execution from NSH: ``CONFIG_NSH_FILE_APPS=y``
+
+Then, build the NuttX firmware image and the export package:
+
+.. code-block:: shell
+
+   $ make
+   $ make export
+
+When ``make export`` completes, you will find a ZIP package in the top-level
+NuttX directory called ``nuttx-export-x.y.zip`` (where x.y corresponds to the
+version, determined by the .version file in the same directory). The contents
+of this ZIP file are organized as follows:
+
+.. code-block:: text
+
+   nuttx-export-x.x
+   |- arch/
+   |- build/
+   |- include/
+   |- libs/
+   |- startup/
+   |- System.map
+   `- .config
+
+Add-On Build Directory
+======================
+
+In order to create the add-on ELF program, you will need:
+
+1. The export package.
+2. A program build Makefile.
+3. A linker script used by the Makefile.
+
+The example Makefile discussed below assumes the use of a GNU toolchain. Note
+that non-GNU toolchains would likely require a significantly different
+Makefile and linker script.
+
+Hello Example
+=============
+
+To keep things manageable, let's use a concrete example. Suppose the ELF 
+program that we wish to add to the release code is the simple 
+source file ``hello.c``:
+
+.. code-block:: c
+
+   #include <stdio.h>
+
+   int main(int argc, char **argv)
+   {
+     printf("Hello from Add-On Program!\n");
+     return 0;
+   }
+
+Let's say that we have a directory called ``addon`` that contains the following:
+
+1. The ``hello.c`` source file.
+2. A Makefile to build the ELF program.
+3. A linker script called ``gnu-elf.ld`` needed by the Makefile.
+4. The export package ``nuttx-export-7.25.zip``.
+
+
+Building the ELF Program
+========================
+
+The first step in creating the ELF program is to unzip the export 
+package. Starting in the ``addon`` directory:
+
+.. code-block:: shell
+
+   $ cd addon
+   $ ls
+   gnu-elf.ld hello.c Makefile nuttx-export-7.25.zip
+
+Where:
+- ``gnu-elf.ld`` is the linker script.
+- ``hello.c`` is the example source file.
+- ``Makefile`` builds the ELF program.
+- ``nuttx-export-7.25.zip`` is the export package from NuttX 7.25.
+
+Unzip the export package as follows:
+
+.. code-block:: shell
+
+   $ unzip nuttx-export-7.25.zip
+
+This creates a new directory called ``nuttx-export-7.25``, containing 
+all the content from the released NuttX code required to build 
+the ELF program.
+
+
+The Makefile
+============
+
+To build the ELF program, simply run:
+
+.. code-block:: shell
+
+   $ make
+
+This uses the following Makefile to generate several files:
+- ``hello.o``: The compiled object file for ``hello.c``.
+- ``hello``: The linked ELF program.
+
+Only the resulting ``hello`` file is needed.
+
+The Makefile used to create the ELF program is as follows:
+
+.. code-block:: shell
+
+    include nuttx-export-7.25/build/Make.defs
+    
+    # Long calls are need to call from RAM into FLASH
+    
+    ARCHCFLAGS += -mlong-calls
+    ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
+    ARCHOPTIMIZATION = -Os -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+    ARCHINCLUDES = -I. -isystem  nuttx-export-7.25/include
+    
+    CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHINCLUDES) -pipe
+    
+    CROSSDEV = arm-none-eabi-
+    CC = $(CROSSDEV)gcc
+    LD = $(CROSSDEV)ld
+    STRIP = $(CROSSDEV)strip --strip-unneeded
+    
+    # Setup up linker command line options
+    
+    LDELFFLAGS = -r -e main
+    LDELFFLAGS += -T gnu-elf.ld
+    
+    # This might change in a different environment
+    
+    OBJEXT ?= .o
+    
+    # This is the generated ELF program
+    
+    BIN = hello
+    
+    # These are the sources files that we use
+    
+    SRCS = hello.c
+    OBJS = $(SRCS:.c=$(OBJEXT))
+    
+    # Build targets
+    
+    all: $(BIN)
+    .PHONY: clean
+    
+    $(OBJS): %$(OBJEXT): %.c
+    $(CC) -c $(CFLAGS) $< -o $@
+    
+    $(BIN): $(OBJS)
+    $(LD) $(LDELFFLAGS) -o $@ $^
+    $(STRIP) $(BIN)
+    
+    clean:
+    rm -f $(BIN)
+    rm -f *.o
+
+The Linker Script
+=================
+
+The linker script that I am using in this example, gnu-elf.ld, 
+contains the following:
+
+.. code-block:: shell
+
+    SECTIONS
+    {
+    .text 0x00000000 :
+        {
+        _stext = . ;
+        *(.text)
+        *(.text.*)
+        *(.gnu.warning)
+        *(.stub)
+        *(.glue_7)
+        *(.glue_7t)
+        *(.jcr)
+        _etext = . ;
+        }
+    
+    .rodata :
+        {
+        _srodata = . ;
+        *(.rodata)
+        *(.rodata1)
+        *(.rodata.*)
+        *(.gnu.linkonce.r*)
+        _erodata = . ;
+        }
+    
+    .data :
+        {
+        _sdata = . ;
+        *(.data)
+        *(.data1)
+        *(.data.*)
+        *(.gnu.linkonce.d*)
+        _edata = . ;
+        }
+    
+    .bss :
+        {
+        _sbss = . ;
+        *(.bss)
+        *(.bss.*)
+        *(.sbss)
+        *(.sbss.*)
+        *(.gnu.linkonce.b*)
+        *(COMMON)
+        _ebss = . ;
+        }
+    
+        /* Stabs debugging sections.    */
+    
+        .stab 0 : { *(.stab) }
+        .stabstr 0 : { *(.stabstr) }
+        .stab.excl 0 : { *(.stab.excl) }
+        .stab.exclstr 0 : { *(.stab.exclstr) }
+        .stab.index 0 : { *(.stab.index) }
+        .stab.indexstr 0 : { *(.stab.indexstr) }
+        .comment 0 : { *(.comment) }
+        .debug_abbrev 0 : { *(.debug_abbrev) }
+        .debug_info 0 : { *(.debug_info) }
+        .debug_line 0 : { *(.debug_line) }
+        .debug_pubnames 0 : { *(.debug_pubnames) }
+        .debug_aranges 0 : { *(.debug_aranges) }
+    }
+
+Replacing NSH Built-In Functions
+================================
+
+Files can be executed by NSH from the command line by simply typing the name 
+of the ELF program. This requires (1) that the feature be enabled with 
+``CONFIG_NSH_FILE_APP=y`` and (2) that support for the PATH variable is 
+enabled with ``CONFIG_BINFMT_EXEPATH=y`` and ``CONFIG_PATH_INITIAL`` set to 
+the mount point of the file system that may contain ELF programs.
+
+In this example, there is no application in the base firmware called 
+``hello``. So attempts to run ``hello`` will fail:
+
+.. code-block:: shell
+
+   nsh> hello
+   nsh: hello: command not found
+   nsh>
+
+But if we mount the SD card containing the ``hello`` image that we created 
+above, then we can successfully execute the ``hello`` command:
+
+.. code-block:: shell
+
+   nsh> mount -t vfat /dev/mmcsd0 /bin
+   nsh> ls /bin
+   /bin:
+    System Volume Information/
+    hello
+   nsh> hello
+   Hello from Add-On Program!
+   nsh>
+
+Here we showed how you can add a new command to NSH to a product without 
+modifying the base firmware. We can also replace or update an existing 
+built-in application in this way:
+
+In the above configuration, NSH will first attempt to run the program called 
+``hello`` from the file system. This will fail because we have not yet put 
+our custom ``hello`` ELF program in the file system. So instead, NSH will 
+fallback and execute the built-in application called ``hello``. In this way, 
+any command known to NSH can be replaced from an ELF program installed in a 
+mounted file system directory that can be found via the PATH variable.
+
+After we do add our custom ``hello`` to the file system, when NSH attempts to 
+run the program called ``hello`` from the file system it will run 
+successfully. The built-in version will be ignored. It has been replaced with 
+the version in the file system.
+
+Tightly Coupled Memories
+========================
+
+Most MCUs based on ARMv7-M family processors support some kind of Tightly 
+Coupled Memory (TCM). These TCMs have somewhat different properties for 
+specialized operations. Depending on the bus matrix of the processor, you 
+may not be able to execute programs from the TCM. For instance, the STM32 F4 
+supports Core Coupled Memory (CCM), but since it is tied directly to the 
+D-bus, it cannot be used to execute programs! On the other hand, the STM32F3 
+has a CCM that is accessible to both the D-Bus and the I-Bus, in which case 
+it should be possible to execute programs from this TCM.
+
+.. image:: ./image/system_arch_stm32f42xx_and_f43xx.png
+
+.. image:: ./image/system_arch_stm32f303xBC_and_f358xC.png
+
+When ELF programs are loaded into memory, the memory is allocated from the 
+heap via a standard memory allocator. By default with the STM32 F4, the CCM 
+is included in the heap and will typically be allocated first. If CCM memory 
+is allocated to hold the ELF program in memory, then a hard-fault will occur 
+immediately when you try to execute the ELF program in memory.
+
+Therefore, it is necessary on STM32 F4 platforms to include the following 
+configuration setting:
+
+.. code-block:: shell
+
+   CONFIG_STM32_CCMEXCLUDE=y
+
+With that setting, the CCM memory will be excluded from the heap and so will 
+never be allocated for ELF program memory.
--- a/Documentation/guides/port.rst
+++ b/Documentation/guides/port.rst
@ -66,10 +66,14 @@ After that, try follwoing procedure.
 |      |               | count the time accurately or not.                                  |
 +------+---------------+--------------------------------------------------------------------+

-The result of porting procedure
+Porting Case Studies
 ===============================

-Although these depend on specific kernel version.
+These porting guides depend on specific kernel versions, as some code structures have changed over time. They will still
+provide a general idea on how to port.

 .. toctree::
-  port_arm_cm4.rst
+   :glob:
+   :maxdepth: 1
+
+   porting-case-studies/*
--- a/Documentation/guides/porting-case-studies/bcm2711-rpi4b.rst
+++ b/Documentation/guides/porting-case-studies/bcm2711-rpi4b.rst
@ -0,0 +1,382 @@
+Porting to the BCM2711 (Raspberry Pi 4B)
+========================================
+
+This port was completed for the 12.7.0 version of the NuttX kernel, and was contributed by Matteo Golin.
+
+The pull request with this initial support can be found at `apache/nuttx/pull/15188
+<https://github.com/apache/nuttx/pull/15188>`_.
+
+The port required support to be written for a new chip (the BCM2711) and a new board. Matteo created journal entries
+while working on the initial port, which can be found `on his blog
+<https://linguini1.github.io/blog/2024/12/25/nuttx-bcm2711.html>`_. The details below are a more concise summary of the
+porting process.
+
+Researching
+-----------
+
+The first step to porting a board to NuttX was researching the board and how NuttX works.
+
+The BCM2711 is a quad-core ARM Cortex A72 based SoC, and it supports both aarch64 and 32 bit ARM architectures. I
+focused on the aarch64 implementation only in this port. My first step was determining other boards already in the NuttX
+kernel that used the aarch64 architecture, because that gives me a starting point to porting this new chip and board.
+
+I primarily used the blog posts written by Lup Yuen Lee about porting NuttX to the PinePhone, another ARM Cortex-A based
+device. The articles are listed `here <https://github.com/lupyuen/pinephone-nuttx>`_. Lup's articles provided me with an
+understanding of the NuttX boot process, as well as which files from the aarch64 support on NuttX were pulled into the
+build process for booting. He also showed how he created an initial UART driver using the NuttX structure for UART
+drivers, which allowed him to get NSH appearing in the console.
+
+Finally, I also of course needed the BCM2711 datasheet in order to figure out which registers were available to me for
+creating peripheral drivers. The BCM2711 datasheet isn't exceptionally detailed on many of the features on the SoC, but
+it did provide enough detail to set up interrupts and get UART working.
+
+Adding to the source tree
+-------------------------
+
+In order to build my code with the NuttX build system, I would have to add the board and the BCM2711 chip to the source
+tree for NuttX. This way, it would appear as an available configuration via the ``tools/configure.sh`` script and I
+could select options for it with ``make menuconfig``.
+
+The first thing to do was to add the chip, which goes under the ``arch/arm64`` directory because it is an ARM 64 bit
+SoC. The chip directory must be added in two places: ``arch/arm64/include/bcm2711`` and ``arch/arm64/src/bcm2711``. C
+files go in the ``src`` directory with some header files, and some specific header files go in the ``include``
+directory.
+
+In addition, in order to make the BCM2711 visible as a supported chip, I had to add it as an option in
+``arch/arm64/Kconfig``. In order to do this, I just copy-pasted the entry for the Allwinner A64, since the two chips
+were very similar. I had to change a few fields (for instance, selecting ``ARCH_CORTEX_A72`` instead of
+``ARCH_CORTEX_A53``), but this was relatively simple to complete with the information about the SoC. I also needed to
+specify ``ARMV8A_HAVE_GICv2``, since that is the interrupt controller used by the BCM2711. ``ARCH_HAVE_MULTICPU``
+because it is a quad-core, and ``ARCH_USE_MMU`` because it has a memory management unit.
+
+I also needed to now add the Raspberry Pi 4B board to the source tree. To do this, I copied the board folder for the
+PinePhone (``boards/arm64/a64/pinephone``) and renamed it ``raspberrypi-4b``. I also deleted many of the files in this
+folder since they weren't applicable to the Pi 4B, and substituted all mentions of the PinePhone with the Raspberry Pi
+4B (in path names and header include guards).
+
+I then added the Pi 4B to the list of supported boards in ``boards/Kconfig``. For this, I just needed to create an entry
+with the name ``ARCH_BOARD_RASPBERRYPI_4B`` and write that it depends on the ``ARCH_CHIP_BCM2711``. No additional
+options necessary! In two other places in this file I also had to add some directives to make sure the Kconfig for the
+board was found properly. These set ``ARCH_BOARD`` to the name of the board directory "raspberrypi-4b" when the Pi 4B was
+selected, and ``source``'d the Kconfig under ``boards/arm64/bcm2711/raspberrypi-4b`` when selected.
+
+The default configuration for this board was copied from the PinePhone's NSH configuration, which I modified to use the
+correct board name, chip, and hardware specific settings. It was still incomplete because there was no code to actually
+boot into NSH, but it was a starting point.
+
+This was basically all I needed for the board to show up as a possible configuration in the source tree!
+
+Mapping out the chip
+--------------------
+
+To start writing code for the BCM2711, I needed to map out the chip. This included the register addresses and the memory
+mapping, which could all be found in the BCM2711 datasheet. From looking at other implementations, the register
+addresses are usually defined as C macros and kept in header files under ``arch/<architecture>/src/<chip>/hardware``.
+This is where I put them as well, defining all the register mappings the different groups within individual files (i.e.
+``bmc2711_i2c.h``, ``bcm2711_spi.h``, etc.).
+
+Many peripherals had groupings of memory-mapped registers, defined using a base address and then offsets from that
+address to access the different fields. For instance, the two mini-SPI peripherals had the same structure, each with 12
+registers. The way I commonly saw these macros implemented was something like:
+
+.. code-block:: c
+
+   #define BCM_AUX_SPI1_BASEADDR (BCM_AUX_BASEADDR + BCM_AUX_SPI1_OFFSET)
+
+   #define BCM_AUX_SPI_CNTL0_REG_OFFSET (0x00) /* SPI control register 0 */
+   /* ... more register offsets */
+
+   /* This allows you to choose which SPI interface base address to get the register for. */
+
+   #define BCM_AUX_SPI_CNTL0(base) ((base) + BCM_AUX_SPI_CNTL0_REG_OFFSET)
+
+In addition to the registers themselves, I also included macros to mask certain fields within the registers or set
+certain values. This makes the code less error prone later, because any mistakes made while copying the long list of
+fields and registers from the datasheet can be changed in one place.
+
+.. code-block:: c
+
+   #define BCM_SPI_CNTL0_EN (1 << 11) /* Enable SPI interface */
+
+In addition to the registers, I also had to map the interrupts. This was done in ``include/bcm2711/irq.h``. I copied the
+IRQ numbers from the datasheet and listed them all as macros with names. I also had to define the number of IRQS, which
+was 216 in this case. The ``MPID_TO_CORE(mpid)`` macro was copied from another arm64 implementation.
+
+.. code-block:: c
+
+   #define NR_IRQS 216
+   #define MPID_TO_CORE(mpid) (((mpid) >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK)
+
+   /* VideoCore interrupts */
+
+   #define BCM_IRQ_VC_BASE 96
+   #define BCM_IRQ_VC(n) (BCM_IRQ_VC_BASE + n)
+
+   #define BCM_IRQ_VC_TIMER0 BCM_IRQ_VC(0)
+   #define BCM_IRQ_VC_TIMER1 BCM_IRQ_VC(1)
+   /* More interrupts ... */
+
+Finally was to define the memory mapping within the ``include/bcm2711/chip.h`` file. I did so simply since I was only
+testing on the 4GB version of the BCM2711. The RAM starts at address 0, and is roughly 4GB in size. 64 MB of that is
+reserved for the memory-mapped I/O, so I had to be sure to remove that. I also defined the load address of the kernel in
+memory for the chip.
+
+.. code-block:: c
+
+   #define CONFIG_RAMBANK1_ADDR (0x000000000)
+
+   /* Both the 4GB and 8GB ram variants use all the size in RAMBANK1 */
+
+   #if defined(CONFIG_RPI4B_RAM_4GB) || defined(CONFIG_RPI4B_RAM_8GB)
+   #define CONFIG_RAMBANK1_SIZE GB(4) - MB(64)
+   #endif /* defined(CONFIG_RPI4B_RAM_4GB) || defined(CONFIG_RPI4B_RAM_8GB) */
+
+   /* Raspberry Pi 4B loads NuttX at this address */
+
+   #define CONFIG_LOAD_BASE 0x480000
+
+The same load address had to be specified in the linker script for the Raspberry Pi 4B kernel. This scripts tells the
+compiler how to lay out the kernel code in memory and what addresses to use. I was able to copy it from the PinePhone
+and just change the load address to ``0x480000``.
+
+Figuring out the boot
+---------------------
+
+The first thing I wanted to do was determine how much work had already been done for aarch64 that would allow me to more
+easily complete the port. In Lup's blogs, he tested out support for his core type (ARM Cortex-A53 on the PinePhone) by
+booting the aarch64 instance of QEMU with NuttX using that core. I decided to take the same approach, and was able to
+successfully boot on ARM Cortex-A72 using QEMU following his blog. This was a nice confirmation that the hardware I was
+using was already supported in NuttX for booting the OS and getting NSH working with a PL011 UART interface.
+
+I cannot stress enough that the reason porting to this chip was made so much easier was because I am standing on the
+shoulders of giants. NuttX contributors had already set up the boot scripts written in assembly, timer configuration,
+interrupt handling and drivers for a lot of the standard features in aarch64 architectures. I did not have to deal with
+any of this because of them, and it really cut down on the amount of assembly I had to read and understand. I also
+barely had to write any assembly outside of debugging the boot process a little (we'll get to that later). Not to
+mention I had Lup's well-written articles to guide me.
+
+In order to compile and boot the board, I had to add a definition for ``g_mmu_config``, which I was confused about and
+left empty initially just to get past the compilation stage. I also defined the ``GICR_OFFSET`` and ``GICR_BASE`` macros
+for the GICv2 interrupt controller by copying them from the Allwinner chip, which used the same controller. After
+reading further in Lup's blog, I learned that the boot script has a ``PRINT`` macro which is called early in the boot
+process, and requires an implementation of ``up_lowputc`` to print to the console. This would be the first thing I need
+to implement. This compiled, but when I booted the Pi, nothing happened.
+
+After quite a while of trying different things and looking at other implementations, I noticed that many people were
+using register manipulation directly in the early print functions. I decided I would do the same, but instead of
+printing (a more complex operation), I would turn one of the GPIO pins high. I was able to measure this with my
+multimeter and confirm that the GPIO did get set, so I knew that the ``arm64_earlyprint_init`` function was getting
+called. Something was wrong with my UART configuration.
+
+I then tried directly manipulating registers to put the text "hi" in the UART FIFO. When I booted again, this printed,
+but then was followed by some garbled output. It appeared that the the ``char *`` pointer passed to the print function
+was getting garbled. After troubleshooting by printing characters directly by calling my ``arm64_lowputc`` in the
+assembly boot script, I discovered that I could print a string from the C definition if I declared the string as static.
+I also investigated the elf generated by building and confirmed the string was located in ``.rodata``. I was suspicious
+that I was loading the kernel incorrectly into memory and some addresses were getting mixed up. Sure enough, I had
+defined the load address in the linker script as ``0x80000`` instead of ``0x480000``. Fixing this allowed me to see the
+boot messages properly!
+
+I received this message in the console:
+
+.. code-block:: console
+
+   ----gic_validate_dist_version: No GIC version detect
+   arm64_gic_initialize: no distributor detected, giving up ret=-19
+   _assert: Current Version: NuttX  12.6.0-RC0 6791d4a1c4-dirty Aug  4 2024 00:38:21 arm64
+   _assert: Assertion failed panic: at file: common/arm64_fatal.c:375 task: Idle_Task process: Kernel 0x481418
+
+I had accidentally kept the GICv3 in my config files when copying things from other boards, and changed it to GICv2.
+That resolved the issue and presented me with a new one:
+
+.. code-block:: console
+
+   MESS:00:00:06.144520:0:----_assert: Current Version: NuttX  12.6.0-RC0 f81fb7a076-dirty Aug  4 2024 16:16:30 arm64
+   _assert: Assertion failed panic: at file: common/arm64_fatal.c:375 task: Idle_Task process: Kernel 0x4811e4
+
+After enabling all of the debug output in the build options, this became:
+
+.. code-block:: console
+
+   arm64_oneshot_initialize: cycle_per_tick 54000
+   arm64_fatal_error: reason = 0
+   arm64_fatal_error: CurrentEL: MODE_EL1
+   arm64_fatal_error: ESR_ELn: 0xbf000002
+   arm64_fatal_error: FAR_ELn: 0x0
+   arm64_fatal_error: ELR_ELn: 0x48a458
+   print_ec_cause: SError interrupt
+
+This looked like an unhandled interrupt, and after narrowing down which line was failing by adding log statements to the
+kernel code, I discovered it was due to the spinlock code. An exception was being caused by the ``ldaxr`` instruction,
+which the ARM documentation said could only be used once the MMU was enabled. I then enabled the MMU as well as its
+debug information and was greeted with the lovely error:
+
+.. code-block:: console
+
+   MESS:00:00:06.174977:0:----arm64_mmu_init: xlat tables:
+   arm64_mmu_init: base table(L1): 0x4cb000, 64 entries
+   arm64_mmu_init: 0: 0x4c4000
+   arm64_mmu_init: 1: 0x4c5000
+   arm64_mmu_init: 2: 0x4c6000
+   arm64_mmu_init: 3: 0x4c7000
+   arm64_mmu_init: 4: 0x4c8000
+   arm64_mmu_init: 5: 0x4c9000
+   arm64_mmu_init: 6: 0x4ca000
+   init_xlat_tables: mmap: virt 4227858432x phys 4227858432x size 67108864x
+   set_pte_table_desc:   
+   set_pte_table_desc: 0x4cb018: [Table] 0x4c4000
+   init_xlat_tables: mmap: virt 0x phys 0x size 1006632960x
+   set_pte_table_desc:   
+   set_pte_table_desc: 0x4cb000: [Table] 0x4c5000
+   init_xlat_tables: mmap: virt 4718592x phys 4718592x size 192512x
+   split_pte_block_desc: Splitting existing PTE 0x4c5010(L2)
+   set_pte_table_desc:     
+   set_pte_table_desc: 0x4c5010: [Table] 0x4c6000
+   init_xlat_tables: mmap: virt 4911104x phys 4911104x size 81920x
+   init_xlat_tables: mmap: virt 4993024x phys 4993024x size 65536x
+   enable_mmu_el1: MMU enabled with dcache
+   nx_start: Entry
+   up_allocate_heap: heap_start=0x0x4d3000, heap_size=0x47b2d000
+   mm_initialize: Heap: name=Umem, start=0x4d3000 size=1202900992
+   mm_addregion: [Umem] Region 1: base=0x4d32a8 size=1202900304
+   arm64_fatal_error: reason = 0
+   arm64_fatal_error: CurrentEL: MODE_EL1
+   arm64_fatal_error: ESR_ELn: 0x96000045
+   arm64_fatal_error: FAR_ELn: 0x47fffff8
+   arm64_fatal_error: ELR_ELn: 0x489d28
+   print_ec_cause: Data Abort taken without a change in Exception level
+   _assert: Current Version: NuttX  12.6.0-RC0 96be557b64-dirty Aug  5 2024 14:56:42 arm64
+   _assert: Assertion failed panic: at file: common/arm64_fatal.c:375 task: Idle_Task process: Kernel 0x481a34
+   up_dump_register: stack = 0x4d2e10
+   up_dump_register: x0:   0x13                x1:   0x4d32c0
+   up_dump_register: x2:   0xfe215040          x3:   0xfe215040
+   up_dump_register: x4:   0x0                 x5:   0x0
+   up_dump_register: x6:   0x1                 x7:   0xdba53f65cc808a8
+   up_dump_register: x8:   0xc4276feb17c016ba  x9:   0xecbcfeb328124450
+   up_dump_register: x10:  0xb7989dd7d34a1280  x11:  0x5ebf5f572386fdee
+   up_dump_register: x12:  0x6f7c07d067f6e38   x13:  0x3f7b5adaf798b4d5
+   up_dump_register: x14:  0xf3dffbe2e4cff736  x15:  0xd76b1c050c964ea0
+   up_dump_register: x16:  0x6d6fa9cfeeb0eff8  x17:  0x1a051d808a830286
+   up_dump_register: x18:  0x3f7b5adaf798b4bf  x19:  0x4d3000
+   up_dump_register: x20:  0x47fffff0          x21:  0x4d32d0
+   up_dump_register: x22:  0x47b2cd30          x23:  0x4d32a8
+   up_dump_register: x24:  0x4d32b0            x25:  0x4806f4
+   up_dump_register: x26:  0x2f56f66b2df71556  x27:  0x74ee6bbfb5d438f4
+   up_dump_register: x28:  0x7ef57ab47b85f74f  x29:  0x9a7fa1cb06923003
+   up_dump_register: x30:  0x489cf8          
+   up_dump_register: 
+   up_dump_register: STATUS Registers:
+   up_dump_register: SPSR:      0x600002c5        
+   up_dump_register: ELR:       0x489d28          
+   up_dump_register: SP_EL0:    0x4d3000          
+   up_dump_register: SP_ELX:    0x4d2f40          
+   up_dump_register: TPIDR_EL0: 0x0               
+   up_dump_register: TPIDR_EL1: 0x0               
+   up_dump_register: EXE_DEPTH: 0x1                 
+
+Some more debugging allowed me to determine that the ``CONFIG_RAM_START`` and ``CONFIG_RAM_SIZE`` macros in the
+defconfig for my nsh configuration were still set to the values from the PinePhone that I copied from. I set these to
+the correct values for the Raspberry Pi 4B and got much further!
+
+.. code-block:: console
+
+   MESS:00:00:06.211786:0:----irq_attach: In irq_attach
+   irq_attach: before spin_lock_irqsave
+   spin_lock_irqsave: me: 0
+   spin_lock_irqsave: before spin_lock
+   spin_lock: about to enter loop
+   spin_lock: loop over
+   spin_lock_irqsave: after spin_lock
+   irq_attach: after spin_lock_irqsave
+   irq_attach: before spin_unlock_irqrestore
+   irq_attach: after spin_unlock_irqrestore
+   arm64_serialinit: arm64_serialinit not implemented
+   group_setupidlefiles: ERROR: Failed to open stdin: -38
+   _assert: Current Version: NuttX  12.6.0-RC0 be262c7ad3-dirty Aug  5 2024 17:16:27 arm64
+   _assert: Assertion failed : at file: init/nx_start.c:728 task: Idle_Task process: Kernel 0x48162c
+   up_dump_register: stack = 0x4c0170
+   up_dump_register: x0:   0x4c0170            x1:   0x0
+   up_dump_register: x2:   0x0                 x3:   0x0
+   up_dump_register: x4:   0x0                 x5:   0x0
+   up_dump_register: x6:   0x3                 x7:   0x0
+   up_dump_register: x8:   0x4c7468            x9:   0x0
+   up_dump_register: x10:  0x4c7000            x11:  0x4
+   up_dump_register: x12:  0x4b8000            x13:  0x4b7000
+   up_dump_register: x14:  0x1                 x15:  0xfffffff7
+   up_dump_register: x16:  0x48a654            x17:  0x0
+   up_dump_register: x18:  0x1                 x19:  0x0
+   up_dump_register: x20:  0x4ac181            x21:  0x4bf430
+   up_dump_register: x22:  0x0                 x23:  0x4c0170
+   up_dump_register: x24:  0x4c0170            x25:  0x2d8
+   up_dump_register: x26:  0x240               x27:  0x4b7000
+   up_dump_register: x28:  0xfdc3ed41d6862df6  x29:  0xbf8e8f7280a0100
+   up_dump_register: x30:  0x481bf8          
+   up_dump_register: 
+   up_dump_register: STATUS Registers:
+   up_dump_register: SPSR:      0x20000245        
+   up_dump_register: ELR:       0x480230          
+   up_dump_register: SP_EL0:    0x4c7000          
+   up_dump_register: SP_ELX:    0x4c6e90          
+   up_dump_register: TPIDR_EL0: 0x4bf430          
+   up_dump_register: TPIDR_EL1: 0x4bf430          
+   up_dump_register: EXE_DEPTH: 0x0               
+   dump_tasks:    PID GROUP PRI POLICY   TYPE    NPX STATE   EVENT      SIGMASK          STACKBASE  STACKSIZE      USED   FILLED    COMMAND
+   dump_tasks:   ----   --- --- -------- ------- --- ------- ---------- ---------------- 0x4c4000      4096       144     3.5%    irq
+   dump_task:       0     0   0 FIFO     Kthread - Running            0000000000000000 0x4c5010      8176      1200    14.6%    Idle_Task
+   
+   CTRL-A Z for help | 115200 8N1 | NOR | Minicom 2.9 | VT102 | Offline | ttyUSB0
+
+We actually got into tasks now! It appears stdin failed to open because in my Mini-UART driver implementation I had the
+``attach`` and ``ioctl`` functions return ``-ENOSYS``. Just changing this to 0 for success in the interim allowed us to
+get even further, and I could see the beginnings of NSH spawning.
+
+.. code-block:: console
+
+   mm_initialize: Heap: name=Umem, start=0x4cc000 size=4222828544
+   mm_addregion: [Umem] Region 1: base=0x4cc2a8 size=4222827856
+   mm_malloc: Allocated 0x4cc2d0, size 144
+   mm_malloc: Allocated 0x4cc360, size 80
+   gic_validate_dist_version: GICv2 detected
+   up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 54.0MHz
+   arm64_oneshot_initialize: oneshot_initialize
+   mm_malloc: Allocated 0x4cc3b0, size 48
+   arm64_oneshot_initialize: cycle_per_tick 54000
+   uart_register: Registering /dev/console
+   mm_malloc: Allocated 0x4cc3e0, size 80
+   mm_malloc: Allocated 0x4cc430, size 80
+   uart_register: Registering /dev/ttys0
+   mm_malloc: Allocated 0x4cc480, size 80
+   mm_malloc: Allocated 0x4cc4d0, size 80
+   mm_malloc: Allocated 0x4cc520, size 80
+   mm_malloc: Allocated 0x4cc570, size 32
+   mm_malloc: Allocated 0x4cc590, size 64
+   work_start_highpri: Starting high-priority kernel worker thread(s)
+   mm_malloc: Allocated 0x4cc5d0, size 336
+   mm_malloc: Allocated 0x4cc720, size 8208
+   nxtask_activate: hpwork pid=1,TCB=0x4cc5d0
+   nx_start_application: Starting init thread
+   task_spawn: name=nsh_main entry=0x48b24c file_actions=0 attr=0x4cbfa0 argv=0x4cbf98
+   mm_malloc: Allocated 0x4ce730, size 1536
+   mm_malloc: Allocated 0x4ced30, size 64
+   mm_malloc: Allocated 0x4ced70, size 32
+   mm_malloc: Allocated 0x4ced90, size 8208
+   nxtask_activate: nsh_main pid=2,TCB=0x4ce730
+   lib_cxx_initialize: _sinit: 0x4ad000 _einit: 0x4ad000
+   mm_malloc: Allocated 0x4d0da0, size 848
+   mm_free: Freeing 0x4d0da0
+   mm_free: Freeing 0x4ced70
+   mm_free: Freeing 0x4ced30
+   nxtask_exit: nsh_main pid=2,TCB=0x4ce730
+   mm_free: Freeing 0x4ced90
+   mm_free: Freeing 0x4ce730
+   nx_start: CPU0: Beginning Idle Loop
+
+It seemed like we were waiting on an interrupt which never occurred. This was weird, because my Mini-UART driver had an
+interrupt implementation and appeared to be written just fine. This took hours of debugging, logging from interrupt
+handlers and dumping register values, but eventually I determined that the BCM2711 datasheet actually had an error where
+the TX and RX interrupt fields were swapped in the datasheet. A blog post online had mentioned this for the BCM2835, but
+it appeared to be an issue on this chip as well. Now we were booting into NSH!
+
+It was at this point that the port is considered a success, since I was able to boot into NSH and successfully run the
+``ostest`` benchmark. I went on to write the start of a few more drivers, like the GPIO driver, but this completed the
+requirements for an initial port and is most of what ended up being submitted in the initial pull request.
--- a/Documentation/guides/porting-case-studies/port_arm_cm4.rst
+++ b/Documentation/guides/porting-case-studies/port_arm_cm4.rst
--- a/Documentation/guides/ram_rom_disks.rst
+++ b/Documentation/guides/ram_rom_disks.rst
@ -0,0 +1,119 @@
+=======================
+RAM Disks and ROM Disks
+=======================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/RAM+Disks+and+ROM+Disks
+
+NSH mkrd Command
+================
+
+The typical way to create a RAM disk is by using the NuttShell (NSH) ``mkrd``
+command. The syntax is:
+
+.. code-block:: shell
+
+   mkrd [-m <minor>] [-s <sector-size>] <nsectors>
+
+This command creates a RAM disk consisting of ``<nsectors>`` sectors, each of
+size ``<sector-size>`` (or 512 bytes if ``<sector-size>`` is not specified). The
+RAM disk is then registered as ``/dev/ram<minor>``. If ``<minor>`` is not
+specified, ``mkrd`` attempts to register the RAM disk as ``/dev/ram0``.
+
+Internally, the NSH ``mkrd`` command is a simple wrapper around the OS
+``boardctl()`` interface, using the ``BOARDIOC_MKRD`` command. “Under the hood,”
+this ``boardctl()`` command performs the following:
+
+1. Allocates kernel-space memory with ``kmm_malloc()`` of size ``<nsectors>``
+   times ``<sector-size>``
+2. Zeros the allocated memory, and
+3. Calls the OS-internal function ``ramdisk_register()`` to create the RAM disk.
+
+NSH ROMFS /etc Support
+======================
+
+A ROM disk is a block device created from a read-only file system image stored
+in FLASH or other ROM. There is no NSH command available to create a ROM disk
+at runtime. However, it is possible to enable ROM disk support in NSH using the
+``CONFIG_NSH_ROMFSETC`` option, as described in the section on NSH start-up
+scripts in the `NSH User Guide <https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=139629410>`_.
+
+Any application is able to create a ROM disk using the ``boardctl()`` interface
+with the ``BOARDIOC_ROMDISK`` command.
+
+Creating RAM Disks in Board Bring-Up Logic
+==========================================
+
+RAM disks may be created in board-specific initialization logic that runs in
+supervisor mode. That logic might look as follows:
+
+.. code-block:: c
+
+  int board_ramdisk(int minor, unsigned int sectsize, unsigned int nsectors)
+  {
+    size_t allocsize = (size_t)sectsize * (size_t)nsectors;
+    FAR uint8_t *buffer;
+  
+    /* Allocate the memory backing up the ramdisk */
+  
+    buffer = (FAR uint8_t *)kmm_zalloc(allocsize);
+    if (buffer == NULL)
+      {
+        return -ENOMEM;
+      }
+  
+    /* Then register the ramdisk */
+  
+    ret = ramdisk_register(minor, buffer, nsectors, sectsize,
+                          RDFLAG_WRENABLED | RDFLAG_FUNLINK);
+    if (ret < 0)
+      {
+        kmm_free(buffer);
+      }
+  
+    return ret;
+  }
+
+Alternatively, this could be replaced by a call to the OS internal function
+``mkrd()``.
+
+Creating ROM Disks in Board Bring-Up Logic
+==========================================
+
+.. note::
+
+   Currently, the ``romdisk_register()`` function is only available within the
+   OS. Certain logic in ``apps/`` directly calls ``romdisk_register()``, which
+   violates the portable POSIX OS interface. The correct approach for an
+   application is to create a ROM disk via ``boardctl(BOARDIOC_ROMDISK)`` as
+   described above. Calling ``romdisk_register()`` directly is not only a
+   violation of the NuttX portable interface, but also is not allowed in
+   PROTECTED or KERNEL build modes.
+
+ROM disks, i.e., read-only disks in FLASH, can be created by board bring-up
+logic in a way similar to RAM disks, with the following caveats:
+
+- The FLASH region is not allocated; the FLASH address, the sector size, and the
+  number of sectors must already be known.
+- The ``romdisk_register()`` function is used instead of ``ramdisk_register()``.
+
+A simple example could look like:
+
+.. code-block:: c
+
+  int board_romdisk(int minor, FAR uint8_t *buffer, unsigned int sectsize,
+                    unsigned int nsectors)
+  {
+    /* Register the romdisk */
+  
+    return romdisk_register(minor, buffer, nsectors, sectsize);
+  }
+
+Calling ``romdisk_register()`` is equivalent to calling ``ramdisk_register()``
+with the final parameter ``flags == 0``.
+
+Most ROM disks use the ROMFS file system, although CROMFS is another option.
+Creating ROMFS file system images involves several steps. Tools are available
+to simplify the process of building ROMFS images, but that topic is outside the
+scope of this Wiki page.
--- a/Documentation/guides/reading_can_msgs.rst
+++ b/Documentation/guides/reading_can_msgs.rst
@ -0,0 +1,62 @@
+====================
+Reading CAN Messages
+====================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Reading+CAN+Messages
+
+Twice now, there have been complaints or issues about reading messages from the
+CAN driver. The usual concern is that the driver is somehow losing or dropping
+CAN messages. In these cases, it is often discovered that the CAN driver is
+being used incorrectly and, as is human nature, the driver itself is blamed for
+the problem.
+
+When reading from the CAN driver, multiple messages may be returned, depending
+on two factors:
+
+1. The size of the returned CAN messages.
+2. The size of the buffer provided to receive CAN messages.
+
+It should never be assumed that a single message will be returned; making this
+assumption can lead to lost CAN messages under conditions in which the read
+buffer can hold more than one small message. The following example shows how to
+properly handle the CAN read operation:
+
+.. code-block:: c
+
+   #define BUFLEN 128  /* Some arbitrary size for the CAN RX buffer */
+ 
+    FAR struct can_msg_s *msg;
+    char rxbuffer[BUFLEN];
+    ssize_t nread;
+    int nbytes;
+    int msglen
+    int i;
+    
+    /* Read messages into the RX buffer */
+    
+    nread = read(fd, rxbuffer, BUFLEN);
+    
+    /* Check for read errors */
+    ...
+    
+    /* Process each message in the RX buffer */
+    
+    for (i = 0; i <= nread - CAN_MSGLEN(0); i += msglen)
+    {
+    /* Get the next message from the RX buffer */
+    
+        msg    = (FAR struct can_msg_s *)&rxbuffer[i];
+        nbytes = can_dlc2bytes(msg->cm_hdr.ch_dlc);
+        msglen = CAN_MSGLEN(nbytes);
+    
+        DEBUGASSERT(i + msglen < BUFLEN);
+    
+    /* Process the next CAN message */
+    ...
+    }
+
+By looping over the read buffer and parsing out each CAN message, it is
+possible to avoid losing messages that are stored contiguously in the input
+buffer.
--- a/Documentation/guides/remove_device_drivers_nsh.rst
+++ b/Documentation/guides/remove_device_drivers_nsh.rst
@ -0,0 +1,101 @@
+================================
+Removing Device Drivers with NSH
+================================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Removing+Device+Drivers+with+NSH
+
+NuttX and Unix-like Operating Systems Compared
+==============================================
+
+There are many things that are called device drivers. In this context, the
+discussion is limited to **character device drivers**. In NuttX, character
+device drivers are represented by device driver nodes in the top-level :doc:`pseudo
+filesystem </components/filesystem/pseudofs>`.
+
+Standard Unix-like operating systems also support device driver nodes, which
+superficially resemble NuttX device driver nodes: Both look like files and
+usually reside under the top-level ``/dev`` directory. Both can be accessed
+with standard POSIX file system commands such as ``open()``, ``close()``,
+``read()``, ``write()``, and so forth. However, the similarity ends there.
+
+The payload of a standard Unix-like operating system device driver node is a
+device major and minor number. These major and minor device numbers are used to
+look up the actual device driver interface using internal OS logic and data
+structures. A NuttX device node, by contrast, directly holds the device driver
+interface with no intervening lookup. This design is less flexible, but it is
+more efficient and conserves limited resources in an embedded system.
+
+In standard Unix-like operating systems, the device node can simply be deleted
+using the shell command ``rm`` or the programmatic interface ``unlink()``. The
+node is removed, and nothing special happens to the underlying device driver
+(except that it may no longer be accessible).
+
+In NuttX, if the device node were removed in the same way, the entire device
+interface would also be removed, effectively breaking the driver. Internally,
+NuttX supports a function called ``unregister_driver()`` that can be invoked
+to remove a device driver. Therefore, removing the device driver node must
+behave as though ``unregister_driver()`` were called.
+
+The unlink() Method
+===================
+
+How is this accomplished in NuttX? It is done via a special device driver
+method called ``unlink()``.
+
+NuttX device drivers are implemented via a vtable of function pointers. That
+vtable defines the interface between the pseudo-file system and the device
+driver. This vtable is the structure ``struct file_operations`` defined in
+``[nuttx]/include/nuttx/fs/fs.h``. It provides several interfaces that closely
+match the standard POSIX interfaces—``open()``, ``close()``, ``read()``,
+``write()``, etc.—and also includes a method called ``unlink()``. This
+``unlink()`` method is called by the NuttX VFS when a user removes a device
+driver node.
+
+.. note::
+
+   Removal of device driver nodes is only permitted if
+   ``CONFIG_DISABLE_PSEUDOFS_OPERATIONS`` is **not** defined. All pseudo-file
+   system operations may be suppressed to reduce the FLASH footprint in systems
+   with extremely limited resources.
+
+Removing a Device Node from NSH
+===============================
+
+Below is a summary of what happens when a device node is deleted using the NSH
+``rm`` command:
+
+1. The user enters the ``rm`` command. The NSH parser recognizes the command
+   and transfers control to the NSH function ``cmd_rm()``.
+
+2. ``cmd_rm()`` verifies the command, then calls the standard POSIX
+   ``unlink()`` interface. The logic in the VFS ``unlink()`` function in
+   ``[nuttx]/fs/vfs/fs_unlink.c`` is then executed.
+
+3. The VFS ``unlink()`` detects that the target to be removed is a device node
+   in the top-level pseudo-file system. It calls the device driver's
+   ``unlink()`` method. It also removes the device node from the
+   pseudo-filesystem. However, the underlying resources required to support
+   the device driver interface may remain until the device driver frees those
+   resources.
+
+4. When the device driver's ``unlink()`` method is called, it determines if
+   the device resources can be freed immediately. If so, it frees those
+   resources. If, for example, there are still open references to the device
+   driver, it may defer freeing the resources until the last client has closed
+   the device driver and there are no open references. In such a case, it may
+   set a flag indicating that the device driver has been unlinked.
+
+5. If freeing of device driver resources has been deferred, that flag will be
+   examined later. For instance, when the last client of the device driver
+   closes its reference to the driver, it checks whether the unlink operation
+   was deferred. If so, it frees any remaining device driver resources at that
+   time.
+
+.. warning::
+
+   Some character device driver instances do not implement the ``unlink()``
+   method. If problems arise when attempting to remove character drivers as
+   described in this Wiki page, a missing ``unlink()`` method is the most
+   likely cause.
--- a/Documentation/guides/rust.rst
+++ b/Documentation/guides/rust.rst
@ -0,0 +1,90 @@
+===============
+Rust in NuttX
+===============
+
+.. warning::
+    This guide is under development. Rust support in NuttX is experimental.
+
+Introduction
+============
+NuttX is exploring Rust integration to provide memory safety guarantees and modern
+language features while maintaining its small footprint and real-time capabilities.
+
+This guide covers:
+
+- Setting up Rust toolchain for NuttX development
+- Building Rust components with NuttX
+- Interoperability between Rust and C
+- Testing Rust components
+
+Prerequisites
+=============
+- Rust toolchain installed (rustup recommended)
+- NuttX build environment configured
+- Basic knowledge of Rust and NuttX development
+
+Supported Platforms
+===================
+- AArch64 (WIP)
+- ARMv7-A (WIP)
+- ARMv6-M
+- ARMv7-M
+- ARMv8-M
+- RISCV32
+- RISCV64
+
+Getting Started
+===============
+1. Install Rust toolchain and switch to nightly
+
+Please refer to the official Rust installation guide for more details: https://www.rust-lang.org/tools/install
+
+.. code-block:: bash
+
+    rustup toolchain install nightly
+    rustup default nightly
+
+2. Prepare NuttX build environment
+
+Please ensure that you have a working NuttX build environment, and with the following PR merged or cherry-picked:
+- https://github.com/apache/nuttx-apps/pull/2487
+- https://github.com/apache/nuttx/pull/15469
+
+3. Enable essential kernel configurations
+
+Pleae enable the following configurations in your NuttX configuration:
+- CONFIG_SYSTEM_TIME64
+- CONFIG_FS_LARGEFILE
+- CONFIG_TLS_NELEM = 16
+- CONFIG_DEV_URANDOM
+
+The `rv-virt:nsh` board using make as the build system is recommended for testing Rust applications as it has been verified to work with this configuration.
+
+For `rv-virt:nsh` board, you should disable `CONFIG_ARCH_FPU` configuration since RISCV32 with FPU is not supported yet.
+
+4. Enable sample application
+
+Please enable the sample application in your NuttX configuration:
+- CONFIG_EXAMPLES_HELLO_RUST_CARGO
+
+5. Build and run the sample application
+
+Build the NuttX image and run it on your target platform:
+
+.. code-block:: bash
+
+    qemu-system-riscv32 -semihosting -M virt,aclint=on -cpu rv32 -smp 8 -bios nuttx/nuttx -nographic
+
+    NuttShell (NSH) NuttX-12.8.0
+    nsh> hello_rust_cargo
+    {"name":"John","age":30}
+    {"name":"Jane","age":25}
+    Deserialized: Alice is 28 years old
+    Pretty JSON:
+    {
+    "name": "Alice",
+    "age": 28
+    }
+    Hello world from tokio!
+
+Congratulations! You have successfully built and run a Rust application on NuttX.
--- a/Documentation/guides/updating_release_system_elf.rst
+++ b/Documentation/guides/updating_release_system_elf.rst
@ -0,0 +1,34 @@
+===========================================
+Updating a Release System with ELF Programs
+===========================================
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Updating+a+Release+System+with+ELF+Programs
+
+.. warning:: 
+    Migrated from: 
+    https://cwiki.apache.org/confluence/display/NUTTX/Updating+a+Release+System+with+ELF+Programs
+
+You can enhance the functionality of your released embedded system by adding
+ELF programs, which can be loaded from a file system. These programs can be
+stored on an SD card or downloaded into on-board SPI FLASH, allowing for
+easy updates or extensions to the system's firmware.
+
+There are two ways you can accomplish this:
+
+Partially linked
+================
+This describes building the partially linked, relocatable ELF program that 
+depends on a symbol table provided by the base firmware in FLASH.
+
+Reference:
+- See :doc:`Partially Linked ELF Programs <partially_linked_elf>`
+
+Fully linked
+============
+This describes building a fully linked, relocatable ELF program that does 
+not depend on any symbol table information.
+
+Reference:
+- See :doc:`Fully Linked ELF Programs <fully_linked_elf>`
--- a/Documentation/implementation/simulation.rst
+++ b/Documentation/implementation/simulation.rst
--- a/Documentation/platforms/arm/stm32h7/boards/linum-stm32h753bi/index.rst
+++ b/Documentation/platforms/arm/stm32h7/boards/linum-stm32h753bi/index.rst
@ -813,3 +813,83 @@ Configures the board to use the SPI4 and enables RFID driver with MFRC522::
  MOSI     PE6
  CS       PE4
  ======== =====
+
+lvgl
+----
+
+Configures the board to use display of 7 inch with lvgl example.
+
+To verify if the display is functioning correctly, use the **fb** command. You should see the display change colors.::
+
+  nsh> fb
+  VideoInfo:
+        fmt: 11
+      xres: 1024
+      yres: 600
+    nplanes: 1
+  noverlays: 1
+  OverlayInfo (overlay 0):
+      fbmem: 0xc0000000
+      fblen: 1228800
+    stride: 2048
+    overlay: 0
+        bpp: 16
+      blank: 0
+  chromakey: 0x00000000
+      color: 0x00000000
+    transp: 0xff
+      mode: 0
+      area: (0,0) => (1024,600)
+      accl: 1
+  PlaneInfo (plane 0):
+      fbmem: 0xc0000000
+      fblen: 1228800
+    stride: 2048
+    display: 0
+        bpp: 16
+  Mapped FB: 0xc0000000
+  0: (  0,  0) (1024,600)
+  1: ( 93, 54) (838,492)
+  2: (186,108) (652,384)
+  3: (279,162) (466,276)
+  4: (372,216) (280,168)
+  5: (465,270) ( 94, 60)
+  Test finished
+
+Once the **fd** command work, run the lvgl exemple. ::
+
+  nsh> lvgldemo
+
+**WARNING:** This example at the moment is not working correctly yet and have a bug fix to be done.
+In the lvgl file **./apps/graphics/lvgl/lvgl/src/drivers/nuttx/lv_nuttx_fbdev.c**
+search the function **lv_nuttx_fbdev_set_file** and modify line 156 as follows:
+
+    dsc->mem_off_screen = malloc(data_size);
+    to
+    dsc->mem_off_screen = (void*)0xC00000000;
+
+tone
+----
+
+This example demonstrates how to use PWM4 and Timer17 to play music using the Tone library and the board's buzzer.
+
+socketcan
+---------
+
+This example demonstrates how to use the CAN-FD peripherals can0 and can1 with the SocketCAN protocol.::
+
+  # Configure the can0 and can1 to send messages
+  nsh> ifup can0
+  ifup can0...OK
+  nsh> ifup can1
+  ifup can1 ...OK
+  nsh> cansend can0 123#DEADBEEF
+  nsh> cansend can1 5A1#11.2233.44556677.88
+
+  # Reset the board and configure the can0 peripheral to receive messages
+  nsh> ifup can0
+  ifup can0...OK
+  nsh> candump can0
+    can0  051   [8]  00 11 22 33 44 55 66 77
+    can0  051  [16]  00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF
+
--- a/Documentation/platforms/risc-v/bl808/index.rst
+++ b/Documentation/platforms/risc-v/bl808/index.rst
@ -48,7 +48,7 @@ DMA          No
 EMAC         No
 GPADC        Yes
 GPIO         Yes
-I2C          No
+I2C          Yes
 I2S          No
 PWM          No
 SPI          Yes
--- a/Documentation/platforms/risc-v/esp32c3/boards/esp32c3-generic/index.rst
+++ b/Documentation/platforms/risc-v/esp32c3/boards/esp32c3-generic/index.rst
@ -208,6 +208,18 @@ You can scan for all I2C devices using the following command::

    nsh> i2c dev 0x00 0x7f

+nimble
+------
+
+This configuration can be used to test ble using the nimble library. The
+``nimble`` example starts advertising and can be connected to or disconnected
+from. Before starting the ``nimble`` example make sure the bnep0 interface is
+up by issuing::
+
+    nsh> ifup bnep0
+    ifup bnep0...OK
+    nsh> nimble &
+
 nsh
 ---

--- a/Documentation/platforms/risc-v/esp32c3/index.rst
+++ b/Documentation/platforms/risc-v/esp32c3/index.rst
@ -287,7 +287,7 @@ Peripheral  Support NOTES
 =========== ======= ====================
 ADC          No
 AES          No
-Bluetooth    No
+Bluetooth    Yes
 CAN/TWAI     Yes
 CDC Console  Yes    Rev.3
 DMA          Yes
--- a/Documentation/platforms/risc-v/qemu-rv/boards/rv-virt/index.rst
+++ b/Documentation/platforms/risc-v/qemu-rv/boards/rv-virt/index.rst
@ -361,7 +361,7 @@ This configuration is used for 32-bit RISC-V
 python
 ------

-Enables the Python interpreter for NuttX. This configuration is based on `nsh`_.
+Enables the Python interpreter for NuttX. This configuration is based on `netnsh`_.

 For more information on how to build and run Python on NuttX,
 please refer to the :doc:`Python Interpreter </applications/interpreters/python/index>` page.
--- a/arch/Kconfig
+++ b/arch/Kconfig
@ -158,6 +158,7 @@ config ARCH_XTENSA
 	select ARCH_HAVE_INTERRUPTSTACK
 	select ARCH_HAVE_STACKCHECK
 	select ARCH_HAVE_CUSTOMOPT
+	select ARCH_HAVE_THREAD_LOCAL
 	select ARCH_HAVE_TCBINFO
 	select ARCH_HAVE_STDARG_H
 	select ARCH_HAVE_SETJMP if ARCH_TOOLCHAIN_GNU
--- a/arch/arm/include/arm/irq.h
+++ b/arch/arm/include/arm/irq.h
@ -177,7 +177,7 @@ extern volatile bool g_interrupt_context[CONFIG_SMP_NCPUS];

 /* Save the current interrupt enable state & disable IRQs. */

-static inline irqstate_t up_irq_save(void)
+static inline_function irqstate_t up_irq_save(void)
 {
  unsigned int flags;
  unsigned int temp;
@ -194,7 +194,7 @@ static inline irqstate_t up_irq_save(void)

 /* Restore saved IRQ & FIQ state */

-static inline void up_irq_restore(irqstate_t flags)
+static inline_function void up_irq_restore(irqstate_t flags)
 {
  __asm__ __volatile__
    (
@ -206,7 +206,7 @@ static inline void up_irq_restore(irqstate_t flags)

 /* Enable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_enable(void)
+static inline_function irqstate_t up_irq_enable(void)
 {
  unsigned int flags;
  unsigned int temp;
@ -256,6 +256,25 @@ static inline_function void up_set_interrupt_context(bool flag)
 #endif
 }

+static inline_function uint32_t up_getsp(void)
+{
+  register uint32_t sp;
+
+  __asm__ __volatile__
+  (
+    "mov %0, sp\n"
+    : "=r" (sp)
+  );
+
+  return sp;
+}
+
+static inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
 /****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/
--- a/arch/arm/include/armv6-m/irq.h
+++ b/arch/arm/include/armv6-m/irq.h
@ -209,8 +209,7 @@ struct xcptcontext

 /* Get/set the PRIMASK register */

-static inline uint8_t getprimask(void) always_inline_function;
-static inline uint8_t getprimask(void)
+static always_inline_function uint8_t getprimask(void)
 {
  uint32_t primask;
  __asm__ __volatile__
@ -223,8 +222,7 @@ static inline uint8_t getprimask(void)
  return (uint8_t)primask;
 }

-static inline void setprimask(uint32_t primask) always_inline_function;
-static inline void setprimask(uint32_t primask)
+static always_inline_function void setprimask(uint32_t primask)
 {
  __asm__ __volatile__
    (
@ -236,16 +234,14 @@ static inline void setprimask(uint32_t primask)

 /* Disable IRQs */

-static inline void up_irq_disable(void) always_inline_function;
-static inline void up_irq_disable(void)
+static always_inline_function void up_irq_disable(void)
 {
  __asm__ __volatile__ ("\tcpsid  i\n");
 }

 /* Save the current primask state & disable IRQs */

-static inline irqstate_t up_irq_save(void) always_inline_function;
-static inline irqstate_t up_irq_save(void)
+static always_inline_function irqstate_t up_irq_save(void)
 {
  unsigned short primask;

@ -266,16 +262,14 @@ static inline irqstate_t up_irq_save(void)

 /* Enable IRQs */

-static inline void up_irq_enable(void) always_inline_function;
-static inline void up_irq_enable(void)
+static always_inline_function void up_irq_enable(void)
 {
  __asm__ __volatile__ ("\tcpsie  i\n");
 }

 /* Restore saved primask state */

-static inline void up_irq_restore(irqstate_t flags) always_inline_function;
-static inline void up_irq_restore(irqstate_t flags)
+static always_inline_function void up_irq_restore(irqstate_t flags)
 {
  /* If bit 0 of the primask is 0, then we need to restore
   * interrupts.
@ -291,8 +285,7 @@ static inline void up_irq_restore(irqstate_t flags)

 /* Get/set IPSR */

-static inline uint32_t getipsr(void) always_inline_function;
-static inline uint32_t getipsr(void)
+static always_inline_function uint32_t getipsr(void)
 {
  uint32_t ipsr;
  __asm__ __volatile__
@ -307,8 +300,7 @@ static inline uint32_t getipsr(void)

 /* Get/set CONTROL */

-static inline uint32_t getcontrol(void) always_inline_function;
-static inline uint32_t getcontrol(void)
+static always_inline_function uint32_t getcontrol(void)
 {
  uint32_t control;
  __asm__ __volatile__
@ -321,8 +313,7 @@ static inline uint32_t getcontrol(void)
  return control;
 }

-static inline void setcontrol(uint32_t control) always_inline_function;
-static inline void setcontrol(uint32_t control)
+static always_inline_function void setcontrol(uint32_t control)
 {
  __asm__ __volatile__
    (
@ -332,6 +323,20 @@ static inline void setcontrol(uint32_t control)
      : "memory");
 }

+static always_inline_function uint32_t getpsp(void)
+{
+  uint32_t psp;
+
+  __asm__ __volatile__
+    (
+     "\tmrs  %0, psp\n"
+     : "=r" (psp)
+     :
+     : "memory");
+
+  return psp;
+}
+
 /****************************************************************************
 * Name: up_cpu_index
 *
@ -344,7 +349,7 @@ static inline void setcontrol(uint32_t control)
 int up_cpu_index(void) noinstrument_function;
 #endif /* CONFIG_ARCH_HAVE_MULTICPU */

-static inline_function uint32_t up_getsp(void)
+static always_inline_function uint32_t up_getsp(void)
 {
  register uint32_t sp;

@ -357,8 +362,13 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

-noinstrument_function
-static inline_function bool up_interrupt_context(void)
+static always_inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
+static always_inline_function bool up_interrupt_context(void)
 {
  return getipsr() != 0;
 }
--- a/arch/arm/include/armv7-a/irq.h
+++ b/arch/arm/include/armv7-a/irq.h
@ -343,7 +343,7 @@ struct xcptcontext

 /* Return the current IRQ state */

-static inline irqstate_t irqstate(void)
+static inline_function irqstate_t irqstate(void)
 {
  unsigned int cpsr;

@ -360,7 +360,7 @@ static inline irqstate_t irqstate(void)

 /* Disable IRQs and return the previous IRQ state */

-noinstrument_function static inline irqstate_t up_irq_save(void)
+noinstrument_function static inline_function irqstate_t up_irq_save(void)
 {
  unsigned int cpsr;

@ -382,7 +382,7 @@ noinstrument_function static inline irqstate_t up_irq_save(void)

 /* Enable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_enable(void)
+static inline_function irqstate_t up_irq_enable(void)
 {
  unsigned int cpsr;

@ -406,7 +406,7 @@ static inline irqstate_t up_irq_enable(void)

 /* Disable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_disable(void)
+static inline_function irqstate_t up_irq_disable(void)
 {
  unsigned int cpsr;

@ -424,7 +424,8 @@ static inline irqstate_t up_irq_disable(void)

 /* Restore saved IRQ & FIQ state */

-noinstrument_function static inline void up_irq_restore(irqstate_t flags)
+noinstrument_function static inline_function
+void up_irq_restore(irqstate_t flags)
 {
  __asm__ __volatile__
    (
@ -472,6 +473,12 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

+static inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
 noinstrument_function
 static inline_function void up_set_interrupt_context(bool flag)
 {
--- a/arch/arm/include/armv7-m/irq.h
+++ b/arch/arm/include/armv7-m/irq.h
@ -267,8 +267,7 @@ struct xcptcontext

 /* Get/set the PRIMASK register */

-static inline uint8_t getprimask(void) always_inline_function;
-static inline uint8_t getprimask(void)
+static always_inline_function uint8_t getprimask(void)
 {
  uint32_t primask;
  __asm__ __volatile__
@ -281,8 +280,7 @@ static inline uint8_t getprimask(void)
  return (uint8_t)primask;
 }

-static inline void setprimask(uint32_t primask) always_inline_function;
-static inline void setprimask(uint32_t primask)
+static always_inline_function void setprimask(uint32_t primask)
 {
  __asm__ __volatile__
    (
@ -292,14 +290,12 @@ static inline void setprimask(uint32_t primask)
      : "memory");
 }

-static inline void cpsie(void) always_inline_function;
-static inline void cpsie(void)
+static always_inline_function void cpsie(void)
 {
  __asm__ __volatile__ ("\tcpsie  i\n");
 }

-static inline void cpsid(void) always_inline_function;
-static inline void cpsid(void)
+static always_inline_function void cpsid(void)
 {
  __asm__ __volatile__ ("\tcpsid  i\n");
 }
@ -310,8 +306,7 @@ static inline void cpsid(void)
 * lower priority level as the BASEPRI value.
 */

-static inline uint8_t getbasepri(void) always_inline_function;
-static inline uint8_t getbasepri(void)
+static always_inline_function uint8_t getbasepri(void)
 {
  uint32_t basepri;

@ -325,8 +320,7 @@ static inline uint8_t getbasepri(void)
  return (uint8_t)basepri;
 }

-static inline void setbasepri(uint32_t basepri) always_inline_function;
-static inline void setbasepri(uint32_t basepri)
+static always_inline_function void setbasepri(uint32_t basepri)
 {
  __asm__ __volatile__
    (
@ -343,8 +337,7 @@ static inline void setbasepri(uint32_t basepri)
 * 837070 Workaround may be required if we are raising the priority.
 */

-static inline void raisebasepri(uint32_t basepri) always_inline_function;
-static inline void raisebasepri(uint32_t basepri)
+static always_inline_function void raisebasepri(uint32_t basepri)
 {
  register uint32_t primask;

@ -378,8 +371,7 @@ static inline void raisebasepri(uint32_t basepri)

 /* Disable IRQs */

-static inline void up_irq_disable(void) always_inline_function;
-static inline void up_irq_disable(void)
+static always_inline_function void up_irq_disable(void)
 {
  /* Probably raising priority */

@ -388,9 +380,7 @@ static inline void up_irq_disable(void)

 /* Save the current primask state & disable IRQs */

-static inline irqstate_t up_irq_save(void)
-always_inline_function noinstrument_function;
-static inline irqstate_t up_irq_save(void)
+static always_inline_function irqstate_t up_irq_save(void)
 {
  /* Probably raising priority */

@ -401,8 +391,7 @@ static inline irqstate_t up_irq_save(void)

 /* Enable IRQs */

-static inline void up_irq_enable(void) always_inline_function;
-static inline void up_irq_enable(void)
+static always_inline_function void up_irq_enable(void)
 {
  /* In this case, we are always retaining or lowering the priority value */

@ -412,9 +401,7 @@ static inline void up_irq_enable(void)

 /* Restore saved primask state */

-static inline void up_irq_restore(irqstate_t flags)
-always_inline_function noinstrument_function;
-static inline void up_irq_restore(irqstate_t flags)
+static always_inline_function void up_irq_restore(irqstate_t flags)
 {
  /* In this case, we are always retaining or lowering the priority value */

@ -423,8 +410,7 @@ static inline void up_irq_restore(irqstate_t flags)

 /* Get/set IPSR */

-static inline uint32_t getipsr(void) always_inline_function;
-static inline uint32_t getipsr(void)
+static always_inline_function uint32_t getipsr(void)
 {
  uint32_t ipsr;
  __asm__ __volatile__
@ -439,8 +425,7 @@ static inline uint32_t getipsr(void)

 /* Get/set FAULTMASK */

-static inline uint32_t getfaultmask(void) always_inline_function;
-static inline uint32_t getfaultmask(void)
+static always_inline_function uint32_t getfaultmask(void)
 {
  uint32_t faultmask;
  __asm__ __volatile__
@ -453,8 +438,7 @@ static inline uint32_t getfaultmask(void)
  return faultmask;
 }

-static inline void setfaultmask(uint32_t faultmask) always_inline_function;
-static inline void setfaultmask(uint32_t faultmask)
+static always_inline_function void setfaultmask(uint32_t faultmask)
 {
  __asm__ __volatile__
    (
@ -466,8 +450,7 @@ static inline void setfaultmask(uint32_t faultmask)

 /* Get/set CONTROL */

-static inline uint32_t getcontrol(void) always_inline_function;
-static inline uint32_t getcontrol(void)
+static always_inline_function uint32_t getcontrol(void)
 {
  uint32_t control;
  __asm__ __volatile__
@ -480,8 +463,7 @@ static inline uint32_t getcontrol(void)
  return control;
 }

-static inline void setcontrol(uint32_t control) always_inline_function;
-static inline void setcontrol(uint32_t control)
+static always_inline_function void setcontrol(uint32_t control)
 {
  __asm__ __volatile__
    (
@ -491,6 +473,20 @@ static inline void setcontrol(uint32_t control)
      : "memory");
 }

+static always_inline_function uint32_t getpsp(void)
+{
+  uint32_t psp;
+
+  __asm__ __volatile__
+    (
+     "\tmrs  %0, psp\n"
+     : "=r" (psp)
+     :
+     : "memory");
+
+  return psp;
+}
+
 /****************************************************************************
 * Name: up_cpu_index
 *
@ -503,7 +499,7 @@ static inline void setcontrol(uint32_t control)
 int up_cpu_index(void) noinstrument_function;
 #endif /* CONFIG_ARCH_HAVE_MULTICPU */

-static inline_function uint32_t up_getsp(void)
+static always_inline_function uint32_t up_getsp(void)
 {
  register uint32_t sp;

@ -516,8 +512,13 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

-noinstrument_function
-static inline_function bool up_interrupt_context(void)
+static always_inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
+static always_inline_function bool up_interrupt_context(void)
 {
  return getipsr() != 0;
 }
--- a/arch/arm/include/armv7-r/irq.h
+++ b/arch/arm/include/armv7-r/irq.h
@ -342,7 +342,7 @@ struct xcptcontext

 /* Return the current IRQ state */

-static inline irqstate_t irqstate(void)
+static inline_function irqstate_t irqstate(void)
 {
  unsigned int cpsr;

@ -359,7 +359,7 @@ static inline irqstate_t irqstate(void)

 /* Disable IRQs and return the previous IRQ state */

-noinstrument_function static inline irqstate_t up_irq_save(void)
+noinstrument_function static inline_function irqstate_t up_irq_save(void)
 {
  unsigned int cpsr;

@ -380,7 +380,7 @@ noinstrument_function static inline irqstate_t up_irq_save(void)

 /* Enable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_enable(void)
+static inline_function irqstate_t up_irq_enable(void)
 {
  unsigned int cpsr;

@ -401,7 +401,7 @@ static inline irqstate_t up_irq_enable(void)

 /* Disable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_disable(void)
+static inline_function irqstate_t up_irq_disable(void)
 {
  unsigned int cpsr;

@ -419,7 +419,8 @@ static inline irqstate_t up_irq_disable(void)

 /* Restore saved IRQ & FIQ state */

-noinstrument_function static inline void up_irq_restore(irqstate_t flags)
+noinstrument_function static inline_function
+void up_irq_restore(irqstate_t flags)
 {
  __asm__ __volatile__
    (
@ -467,6 +468,12 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

+static inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
 noinstrument_function
 static inline_function void up_set_interrupt_context(bool flag)
 {
--- a/arch/arm/include/armv8-m/irq.h
+++ b/arch/arm/include/armv8-m/irq.h
@ -278,8 +278,7 @@ struct xcptcontext

 /* Get/set the PRIMASK register */

-static inline uint8_t getprimask(void) always_inline_function;
-static inline uint8_t getprimask(void)
+static always_inline_function uint8_t getprimask(void)
 {
  uint32_t primask;
  __asm__ __volatile__
@ -292,8 +291,7 @@ static inline uint8_t getprimask(void)
  return (uint8_t)primask;
 }

-static inline void setprimask(uint32_t primask) always_inline_function;
-static inline void setprimask(uint32_t primask)
+static always_inline_function void setprimask(uint32_t primask)
 {
  __asm__ __volatile__
    (
@ -303,14 +301,12 @@ static inline void setprimask(uint32_t primask)
      : "memory");
 }

-static inline void cpsie(void) always_inline_function;
-static inline void cpsie(void)
+static always_inline_function void cpsie(void)
 {
  __asm__ __volatile__ ("\tcpsie  i\n");
 }

-static inline void cpsid(void) always_inline_function;
-static inline void cpsid(void)
+static always_inline_function void cpsid(void)
 {
  __asm__ __volatile__ ("\tcpsid  i\n");
 }
@ -321,8 +317,7 @@ static inline void cpsid(void)
 * lower priority level as the BASEPRI value.
 */

-static inline uint8_t getbasepri(void) always_inline_function;
-static inline uint8_t getbasepri(void)
+static always_inline_function uint8_t getbasepri(void)
 {
  uint32_t basepri;

@ -336,8 +331,7 @@ static inline uint8_t getbasepri(void)
  return (uint8_t)basepri;
 }

-static inline void setbasepri(uint32_t basepri) always_inline_function;
-static inline void setbasepri(uint32_t basepri)
+static always_inline_function void setbasepri(uint32_t basepri)
 {
  __asm__ __volatile__
    (
@ -351,8 +345,7 @@ static inline void setbasepri(uint32_t basepri)

 /* Disable IRQs */

-static inline void up_irq_disable(void) always_inline_function;
-static inline void up_irq_disable(void)
+static always_inline_function void up_irq_disable(void)
 {
  /* Probably raising priority */

@ -361,9 +354,7 @@ static inline void up_irq_disable(void)

 /* Save the current primask state & disable IRQs */

-static inline irqstate_t up_irq_save(void)
-always_inline_function noinstrument_function;
-static inline irqstate_t up_irq_save(void)
+static always_inline_function irqstate_t up_irq_save(void)
 {
  /* Probably raising priority */

@ -374,8 +365,7 @@ static inline irqstate_t up_irq_save(void)

 /* Enable IRQs */

-static inline void up_irq_enable(void) always_inline_function;
-static inline void up_irq_enable(void)
+static always_inline_function void up_irq_enable(void)
 {
  /* In this case, we are always retaining or lowering the priority value */

@ -385,9 +375,8 @@ static inline void up_irq_enable(void)

 /* Restore saved primask state */

-static inline void up_irq_restore(irqstate_t flags)
-always_inline_function noinstrument_function;
-static inline void up_irq_restore(irqstate_t flags)
+static always_inline_function
+void up_irq_restore(irqstate_t flags)
 {
  /* In this case, we are always retaining or lowering the priority value */

@ -396,8 +385,7 @@ static inline void up_irq_restore(irqstate_t flags)

 /* Get/set IPSR */

-static inline uint32_t getipsr(void) always_inline_function;
-static inline uint32_t getipsr(void)
+static always_inline_function uint32_t getipsr(void)
 {
  uint32_t ipsr;
  __asm__ __volatile__
@ -412,8 +400,7 @@ static inline uint32_t getipsr(void)

 /* Get/set FAULTMASK */

-static inline uint32_t getfaultmask(void) always_inline_function;
-static inline uint32_t getfaultmask(void)
+static always_inline_function uint32_t getfaultmask(void)
 {
  uint32_t faultmask;
  __asm__ __volatile__
@ -426,8 +413,7 @@ static inline uint32_t getfaultmask(void)
  return faultmask;
 }

-static inline void setfaultmask(uint32_t faultmask) always_inline_function;
-static inline void setfaultmask(uint32_t faultmask)
+static always_inline_function void setfaultmask(uint32_t faultmask)
 {
  __asm__ __volatile__
    (
@ -439,8 +425,7 @@ static inline void setfaultmask(uint32_t faultmask)

 /* Get/set CONTROL */

-static inline uint32_t getcontrol(void) always_inline_function;
-static inline uint32_t getcontrol(void)
+static always_inline_function uint32_t getcontrol(void)
 {
  uint32_t control;
  __asm__ __volatile__
@ -453,8 +438,7 @@ static inline uint32_t getcontrol(void)
  return control;
 }

-static inline void setcontrol(uint32_t control) always_inline_function;
-static inline void setcontrol(uint32_t control)
+static always_inline_function void setcontrol(uint32_t control)
 {
  __asm__ __volatile__
    (
@ -464,6 +448,20 @@ static inline void setcontrol(uint32_t control)
      : "memory");
 }

+static always_inline_function uint32_t getpsp(void)
+{
+  uint32_t psp;
+
+  __asm__ __volatile__
+    (
+     "\tmrs  %0, psp\n"
+     : "=r" (psp)
+     :
+     : "memory");
+
+  return psp;
+}
+
 /****************************************************************************
 * Name: up_cpu_index
 *
@ -476,7 +474,7 @@ static inline void setcontrol(uint32_t control)
 int up_cpu_index(void) noinstrument_function;
 #endif /* CONFIG_ARCH_HAVE_MULTICPU */

-static inline_function uint32_t up_getsp(void)
+static always_inline_function uint32_t up_getsp(void)
 {
  uint32_t sp;

@ -489,8 +487,13 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

-noinstrument_function
-static inline_function bool up_interrupt_context(void)
+static always_inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
+static always_inline_function bool up_interrupt_context(void)
 {
  return getipsr() != 0;
 }
--- a/arch/arm/include/armv8-r/irq.h
+++ b/arch/arm/include/armv8-r/irq.h
@ -342,7 +342,7 @@ struct xcptcontext

 /* Return the current IRQ state */

-static inline irqstate_t irqstate(void)
+static inline_function irqstate_t irqstate(void)
 {
  unsigned int cpsr;

@ -359,7 +359,7 @@ static inline irqstate_t irqstate(void)

 /* Disable IRQs and return the previous IRQ state */

-noinstrument_function static inline irqstate_t up_irq_save(void)
+noinstrument_function static inline_function irqstate_t up_irq_save(void)
 {
  unsigned int cpsr;

@ -380,7 +380,7 @@ noinstrument_function static inline irqstate_t up_irq_save(void)

 /* Enable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_enable(void)
+static inline_function irqstate_t up_irq_enable(void)
 {
  unsigned int cpsr;

@ -401,7 +401,7 @@ static inline irqstate_t up_irq_enable(void)

 /* Disable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_disable(void)
+static inline_function irqstate_t up_irq_disable(void)
 {
  unsigned int cpsr;

@ -419,7 +419,8 @@ static inline irqstate_t up_irq_disable(void)

 /* Restore saved IRQ & FIQ state */

-noinstrument_function static inline void up_irq_restore(irqstate_t flags)
+noinstrument_function static inline_function
+void up_irq_restore(irqstate_t flags)
 {
  __asm__ __volatile__
    (
@ -467,6 +468,12 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

+static inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
 noinstrument_function
 static inline_function void up_set_interrupt_context(bool flag)
 {
--- a/arch/arm/include/tlsr82/irq.h
+++ b/arch/arm/include/tlsr82/irq.h
@ -194,7 +194,7 @@ extern volatile bool g_interrupt_context[CONFIG_SMP_NCPUS];

 /* Save the current interrupt enable state & disable IRQs. */

-static inline irqstate_t up_irq_save(void)
+static inline_function irqstate_t up_irq_save(void)
 {
  irqstate_t r = _IRQ_EN_REG;
  _IRQ_EN_REG = 0;
@ -203,36 +203,36 @@ static inline irqstate_t up_irq_save(void)

 /* Restore saved IRQ & FIQ state */

-static inline void up_irq_restore(irqstate_t flags)
+static inline_function void up_irq_restore(irqstate_t flags)
 {
  _IRQ_EN_REG = flags;
 }

 /* Enable IRQs and return the previous IRQ state */

-static inline irqstate_t up_irq_enable(void)
+static inline_function irqstate_t up_irq_enable(void)
 {
  irqstate_t r = _IRQ_EN_REG;
  _IRQ_EN_REG = 1;
  return r;
 }

-static inline void up_irq_disable(void)
+static inline_function void up_irq_disable(void)
 {
  up_irq_save();
 }

-static inline void up_disable_irq(int irq)
+static inline_function void up_disable_irq(int irq)
 {
  _IRQ_MASK_REG &= ~(1 << irq);
 }

-static inline void up_enable_irq(int irq)
+static inline_function void up_enable_irq(int irq)
 {
  _IRQ_MASK_REG |= (1 << irq);
 }

-static inline uint32_t getcontrol(void)
+static inline_function uint32_t getcontrol(void)
 {
  return 0;
 }
@ -262,6 +262,12 @@ static inline_function uint32_t up_getsp(void)
  return sp;
 }

+static inline_function uintptr_t up_getusrsp(void *regs)
+{
+  uint32_t *ptr = (uint32_t *)regs;
+  return ptr[REG_SP];
+}
+
 noinstrument_function
 static inline_function bool up_interrupt_context(void)
 {
--- a/arch/arm/src/CMakeLists.txt
+++ b/arch/arm/src/CMakeLists.txt
@ -29,7 +29,7 @@ add_subdirectory(common)
 target_include_directories(arch BEFORE PUBLIC ${NUTTX_CHIP_ABS_DIR} common
                                              ${ARCH_SUBDIR})

-if(NOT CONFIG_BUILD_FLAT)
+if(CONFIG_BUILD_PROTECTED)
  target_include_directories(arch_interface BEFORE PUBLIC ${NUTTX_CHIP_ABS_DIR}
                                                          common ${ARCH_SUBDIR})
 endif()
--- a/arch/arm/src/am335x/am335x_can.c
+++ b/arch/arm/src/am335x/am335x_can.c
@ -27,9 +27,11 @@
 #include <nuttx/config.h>

 #include <assert.h>
+#include <sched.h>

 #include <arch/board/board.h>
 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>
 #include <nuttx/arch.h>
 #include <nuttx/can/can.h>

@ -205,6 +207,8 @@ static struct can_dev_s g_can1dev =
 };
 #endif

+static spinlock_t g_can_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Private Functions
 ****************************************************************************/
@ -1079,7 +1083,8 @@ struct can_dev_s *am335x_can_initialize(int port)

  syslog(LOG_DEBUG, "CAN%d\n", port);

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_can_lock);
+  sched_lock();

 #ifdef CONFIG_AM335X_CAN0
  if (port == 0)
@ -1109,11 +1114,13 @@ struct can_dev_s *am335x_can_initialize(int port)
    {
      canerr("Unsupported port: %d\n", port);

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_can_lock, flags);
+      sched_unlock();
      return NULL;
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_can_lock, flags);
+  sched_unlock();

  return candev;
 }
@ -1124,7 +1131,8 @@ void am335x_can_uninitialize(struct can_dev_s *dev)

  DEBUGASSERT(dev);

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_can_lock);
+  sched_lock();

 #ifdef CONFIG_AM335X_CAN0
  if (dev == &g_can0dev)
@ -1151,7 +1159,8 @@ void am335x_can_uninitialize(struct can_dev_s *dev)
      canerr("Not a CAN device: %p\n", dev);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_can_lock, flags);
+  sched_unlock();
 }

 #endif
--- a/arch/arm/src/am335x/am335x_gpio.c
+++ b/arch/arm/src/am335x/am335x_gpio.c
@ -31,6 +31,7 @@
 #include <errno.h>

 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>

 #include "chip.h"
 #include "arm_internal.h"
@ -219,6 +220,8 @@ static const uint8_t *g_gpio_padctl[AM335X_GPIO_NPORTS] =
  g_gpio3_padctl,                    /* GPIO3 */
 };

+static spinlock_t g_gpio_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Private Functions
 ****************************************************************************/
@ -364,7 +367,7 @@ int am335x_gpio_config(gpio_pinset_t pinset)

  /* Configure the pin as an input initially to avoid any spurious outputs */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);

  /* Configure based upon the pin mode */

@ -407,7 +410,7 @@ int am335x_gpio_config(gpio_pinset_t pinset)
        break;
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
  return ret;
 }

@ -425,9 +428,9 @@ void am335x_gpio_write(gpio_pinset_t pinset, bool value)
  int port = (pinset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
  int pin  = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
  am335x_gpio_setoutput(port, pin, value);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 }

 /****************************************************************************
@ -445,9 +448,9 @@ bool am335x_gpio_read(gpio_pinset_t pinset)
  int pin  = (pinset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT;
  bool value;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
  value = am335x_gpio_getinput(port, pin);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
  return value;
 }

--- a/arch/arm/src/am335x/am335x_i2c.c
+++ b/arch/arm/src/am335x/am335x_i2c.c
@ -37,6 +37,7 @@

 #include <nuttx/arch.h>
 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>
 #include <nuttx/clock.h>
 #include <nuttx/mutex.h>
 #include <nuttx/semaphore.h>
@ -185,6 +186,7 @@ struct am335x_i2c_priv_s

  int refs;                    /* Reference count */
  mutex_t lock;                /* Mutual exclusion mutex */
+  spinlock_t spinlock;         /* Spinlock */
 #ifndef CONFIG_I2C_POLLED
  sem_t sem_isr;               /* Interrupt wait semaphore */
 #endif
@ -317,6 +319,7 @@ static struct am335x_i2c_priv_s am335x_i2c0_priv =
  .config     = &am335x_i2c0_config,
  .refs       = 0,
  .lock       = NXMUTEX_INITIALIZER,
+  .spinlock   = SP_UNLOCKED,
 #ifndef CONFIG_I2C_POLLED
  .sem_isr    = SEM_INITIALIZER(0),
 #endif
@ -352,6 +355,7 @@ static struct am335x_i2c_priv_s am335x_i2c1_priv =
  .config     = &am335x_i2c1_config,
  .refs       = 0,
  .lock       = NXMUTEX_INITIALIZER,
+  .spinlock   = SP_UNLOCKED,
 #ifndef CONFIG_I2C_POLLED
  .sem_isr    = SEM_INITIALIZER(0),
 #endif
@ -387,6 +391,7 @@ static struct am335x_i2c_priv_s am335x_i2c2_priv =
  .config     = &am335x_i2c2_config,
  .refs       = 0,
  .lock       = NXMUTEX_INITIALIZER,
+  .spinlock   = SP_UNLOCKED,
 #ifndef CONFIG_I2C_POLLED
  .sem_isr    = SEM_INITIALIZER(0),
 #endif
@ -492,7 +497,7 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
  uint32_t regval;
  int ret;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&priv->spinlock);

  /* Enable Interrupts when master mode */

@ -529,6 +534,8 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
   */

  priv->intstate = INTSTATE_WAITING;
+  spin_unlock_irqrestore(&priv->spinlock, flags);
+
  do
    {
      /* Wait until either the transfer is complete or the timeout expires */
@ -551,6 +558,8 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)
        }
    }

+  flags = spin_lock_irqsave(&priv->spinlock);
+
  /* Loop until the interrupt level transfer is complete. */

  while (priv->intstate != INTSTATE_DONE);
@ -563,7 +572,7 @@ static inline int am335x_i2c_sem_waitdone(struct am335x_i2c_priv_s *priv)

  am335x_i2c_putreg(priv, AM335X_I2C_IRQ_EN_CLR_OFFSET, I2C_ICR_CLEARMASK);

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&priv->spinlock, flags);
  return ret;
 }
 #else
@ -992,7 +1001,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
           */

 #ifdef CONFIG_I2C_POLLED
-          irqstate_t flags = enter_critical_section();
+          irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
 #endif

          /* Transmit a byte */
@ -1001,7 +1010,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
          priv->dcnt--;

 #ifdef CONFIG_I2C_POLLED
-          leave_critical_section(flags);
+          spin_unlock_irqrestore(&priv->spinlock, flags);
 #endif
          if ((priv->dcnt == 0) && ((priv->flags & I2C_M_NOSTOP) == 0))
            {
@ -1026,7 +1035,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
           */

 #ifdef CONFIG_I2C_POLLED
-          irqstate_t flags = enter_critical_section();
+          irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
 #endif

          /* Receive a byte */
@ -1036,7 +1045,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
          priv->dcnt--;

 #ifdef CONFIG_I2C_POLLED
-          leave_critical_section(flags);
+          spin_unlock_irqrestore(&priv->spinlock, flags);
 #endif
          if ((priv->msgc <= 0) && (priv->dcnt == 0))
            {
@ -1100,7 +1109,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
               */

 #ifdef CONFIG_I2C_POLLED
-              irqstate_t flags = enter_critical_section();
+              irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
 #endif

              /* Transmit a byte */
@ -1109,7 +1118,7 @@ static int am335x_i2c_isr_process(struct am335x_i2c_priv_s *priv)
              priv->dcnt--;

 #ifdef CONFIG_I2C_POLLED
-              leave_critical_section(flags);
+              spin_unlock_irqrestore(&priv->spinlock, flags);
 #endif
              if ((priv->dcnt == 0) && ((priv->flags & I2C_M_NOSTOP) == 0))
                {
--- a/arch/arm/src/am335x/am335x_irq.c
+++ b/arch/arm/src/am335x/am335x_irq.c
@ -29,6 +29,7 @@
 #include <assert.h>

 #include <nuttx/arch.h>
+#include <nuttx/spinlock.h>

 #include "arm_internal.h"
 #include "sctlr.h"
@ -36,6 +37,13 @@
 #include "am335x_gpio.h"
 #include "am335x_irq.h"

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+#ifdef CONFIG_ARCH_IRQPRIO
+static spinlock_t g_irq_lock = SP_UNLOCKED;
+#endif
+
 /****************************************************************************
 * Public Data
 ****************************************************************************/
@ -328,7 +336,7 @@ int up_prioritize_irq(int irq, int priority)
    {
      /* These operations must be atomic */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_irq_lock);

 #if 0 // TODO
      /* Set the new priority */
@ -340,7 +348,7 @@ int up_prioritize_irq(int irq, int priority)
      putreg32(regval, regaddr);
 #endif

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_irq_lock, flags);
      return OK;
    }

--- a/arch/arm/src/am335x/am335x_serial.c
+++ b/arch/arm/src/am335x/am335x_serial.c
@ -39,6 +39,7 @@
 #endif

 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>
 #include <nuttx/arch.h>
 #include <nuttx/fs/ioctl.h>
 #include <nuttx/serial/serial.h>
@ -76,13 +77,14 @@

 struct up_dev_s
 {
-  uint32_t uartbase;  /* Base address of UART registers */
-  uint32_t baud;      /* Configured baud */
-  uint32_t ier;       /* Saved IER value */
-  uint8_t  irq;       /* IRQ associated with this UART */
-  uint8_t  parity;    /* 0=none, 1=odd, 2=even */
-  uint8_t  bits;      /* Number of bits (7 or 8) */
-  bool     stopbits2; /* true: Configure with 2 stop bits instead of 1 */
+  uint32_t   uartbase;  /* Base address of UART registers */
+  uint32_t   baud;      /* Configured baud */
+  uint32_t   ier;       /* Saved IER value */
+  uint8_t    irq;       /* IRQ associated with this UART */
+  uint8_t    parity;    /* 0=none, 1=odd, 2=even */
+  uint8_t    bits;      /* Number of bits (7 or 8) */
+  bool       stopbits2; /* true: Configure with 2 stop bits instead of 1 */
+  spinlock_t spinlock;  /* Spinlock */
 };

 /****************************************************************************
@ -169,6 +171,7 @@ static struct up_dev_s g_uart0priv =
  .parity         = CONFIG_UART0_PARITY,
  .bits           = CONFIG_UART0_BITS,
  .stopbits2      = CONFIG_UART0_2STOP,
+  .spinlock       = SP_UNLOCKED,
 };

 static uart_dev_t g_uart0port =
@ -200,6 +203,7 @@ static struct up_dev_s g_uart1priv =
  .parity         = CONFIG_UART1_PARITY,
  .bits           = CONFIG_UART1_BITS,
  .stopbits2      = CONFIG_UART1_2STOP,
+  .spinlock       = SP_UNLOCKED,
 };

 static uart_dev_t g_uart1port =
@ -230,6 +234,7 @@ static struct up_dev_s g_uart2priv =
  .parity         = CONFIG_UART2_PARITY,
  .bits           = CONFIG_UART2_BITS,
  .stopbits2      = CONFIG_UART2_2STOP,
+  .spinlock       = SP_UNLOCKED,
 };

 static uart_dev_t g_uart2port =
@ -260,6 +265,7 @@ static struct up_dev_s g_uart3priv =
  .parity         = CONFIG_UART3_PARITY,
  .bits           = CONFIG_UART3_BITS,
  .stopbits2      = CONFIG_UART3_2STOP,
+  .spinlock       = SP_UNLOCKED,
 };

 static uart_dev_t g_uart3port =
@ -290,6 +296,7 @@ static struct up_dev_s g_uart4priv =
  .parity         = CONFIG_UART4_PARITY,
  .bits           = CONFIG_UART4_BITS,
  .stopbits2      = CONFIG_UART4_2STOP,
+  .spinlock       = SP_UNLOCKED,
 };

 static uart_dev_t g_uart4port =
@ -320,6 +327,7 @@ static struct up_dev_s g_uart5priv =
  .parity         = CONFIG_UART5_PARITY,
  .bits           = CONFIG_UART5_BITS,
  .stopbits2      = CONFIG_UART5_2STOP,
+  .spinlock       = SP_UNLOCKED,
 };

 static uart_dev_t g_uart5port =
@ -484,6 +492,10 @@ static uart_dev_t g_uart5port =
 #  define UART5_ASSIGNED      1
 #endif

+/* Spinlock */
+
+static spinlock_t g_gpio_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Inline Functions
 ****************************************************************************/
@ -567,7 +579,7 @@ static inline void am335x_uart0config(void)

  /* Step 1: Enable power to UART0 */

-  flags   = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
 #warning Missing logic

  /* Step 2: Enable clocking to UART0 */
@ -577,7 +589,7 @@ static inline void am335x_uart0config(void)

  am335x_gpio_config(GPIO_UART0_TXD);
  am335x_gpio_config(GPIO_UART0_RXD);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 };
 #endif

@ -588,7 +600,7 @@ static inline void am335x_uart1config(void)

  /* Step 1: Enable power to UART1 */

-  flags   = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
 #warning Missing logic

  /* Step 2: Enable clocking to UART1 */
@ -598,7 +610,7 @@ static inline void am335x_uart1config(void)

  am335x_gpio_config(GPIO_UART1_TXD);
  am335x_gpio_config(GPIO_UART1_RXD);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 };
 #endif

@ -609,7 +621,7 @@ static inline void am335x_uart2config(void)

  /* Step 1: Enable power to UART2 */

-  flags   = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
 #warning Missing logic

  /* Step 2: Enable clocking on UART2 */
@ -619,7 +631,7 @@ static inline void am335x_uart2config(void)

  am335x_gpio_config(GPIO_UART2_TXD);
  am335x_gpio_config(GPIO_UART2_RXD);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 };
 #endif

@ -630,7 +642,7 @@ static inline void am335x_uart3config(void)

  /* Step 1: Enable power to UART3 */

-  flags   = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
 #warning Missing logic

  /* Step 2: Enable clocking to UART3 */
@ -640,7 +652,7 @@ static inline void am335x_uart3config(void)

  am335x_gpio_config(GPIO_UART3_TXD);
  am335x_gpio_config(GPIO_UART3_RXD);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 };
 #endif

@ -651,7 +663,7 @@ static inline void am335x_uart4config(void)

  /* Step 1: Enable power to UART4 */

-  flags   = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
 #warning Missing logic

  /* Step 2: Enable clocking to UART4 */
@ -661,7 +673,7 @@ static inline void am335x_uart4config(void)

  am335x_gpio_config(GPIO_UART4_TXD);
  am335x_gpio_config(GPIO_UART4_RXD);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 };
 #endif

@ -672,7 +684,7 @@ static inline void am335x_uart5config(void)

  /* Step 1: Enable power to UART5 */

-  flags   = enter_critical_section();
+  flags = spin_lock_irqsave(&g_gpio_lock);
 #warning Missing logic

  /* Step 2: Enable clocking to UART5 */
@ -682,7 +694,7 @@ static inline void am335x_uart5config(void)

  am335x_gpio_config(GPIO_UART5_TXD);
  am335x_gpio_config(GPIO_UART5_RXD);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_gpio_lock, flags);
 };
 #endif

@ -1029,18 +1041,18 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)

    case TIOCSBRK:  /* BSD compatibility: Turn break on, unconditionally */
      {
-        irqstate_t flags = enter_critical_section();
+        irqstate_t flags = spin_lock_irqsave(&priv->spinlock);
        up_enablebreaks(priv, true);
-        leave_critical_section(flags);
+        spin_unlock_irqrestore(&priv->spinlock, flags);
      }
      break;

    case TIOCCBRK:  /* BSD compatibility: Turn break off, unconditionally */
      {
        irqstate_t flags;
-        flags = enter_critical_section();
+        flags = spin_lock_irqsave(&priv->spinlock);
        up_enablebreaks(priv, false);
-        leave_critical_section(flags);
+        spin_unlock_irqrestore(&priv->spinlock, flags);
      }
      break;

@ -1204,13 +1216,15 @@ static void up_txint(struct uart_dev_s *dev, bool enable)
  struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
  irqstate_t flags;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&priv->spinlock);
  if (enable)
    {
 #ifndef CONFIG_SUPPRESS_SERIAL_INTS
      priv->ier |= UART_IER_THR;
      up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier);

+      spin_unlock_irqrestore(&priv->spinlock, flags);
+
      /* Fake a TX interrupt here by just calling uart_xmitchars() with
       * interrupts disabled (note this may recurse).
       */
@ -1222,9 +1236,9 @@ static void up_txint(struct uart_dev_s *dev, bool enable)
    {
      priv->ier &= ~UART_IER_THR;
      up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier);
-    }

-  leave_critical_section(flags);
+      spin_unlock_irqrestore(&priv->spinlock, flags);
+    }
 }

 /****************************************************************************
--- a/arch/arm/src/arm/arm_schedulesigaction.c
+++ b/arch/arm/src/arm/arm_schedulesigaction.c
@ -35,6 +35,7 @@

 #include "arm.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -90,8 +91,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
    {
      /* In this case just deliver the signal now. */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }

  /* Otherwise, we are (1) signaling a task is not running
--- a/arch/arm/src/arm/arm_sigdeliver.c
+++ b/arch/arm/src/arm/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -59,9 +60,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 #ifndef CONFIG_SUPPRESS_INTERRUPTS
  /* Then make sure that interrupts are enabled.  Signal handlers must always
@ -73,7 +74,7 @@ void arm_sigdeliver(void)

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -93,7 +94,9 @@ void arm_sigdeliver(void)
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of execution. */

--- a/arch/arm/src/armv6-m/arm_doirq.c
+++ b/arch/arm/src/armv6-m/arm_doirq.c
@ -34,6 +34,7 @@
 #include <nuttx/board.h>
 #include <arch/board/board.h>
 #include <sched/sched.h>
+#include <signal/signal.h>

 #include "arm_internal.h"
 #include "exc_return.h"
@ -86,7 +87,7 @@ uint32_t *arm_doirq(int irq, uint32_t *regs)

      irq_dispatch(irq, regs);
 #endif
-      if (tcb->sigdeliver)
+      if ((tcb->flags & TCB_FLAG_SIGDELIVER) != 0)
        {
          /* Pendsv able to access running tcb with no critical section */

--- a/arch/arm/src/armv6-m/arm_ramvec_attach.c
+++ b/arch/arm/src/armv6-m/arm_ramvec_attach.c
@ -31,11 +31,18 @@

 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
+#include <nuttx/spinlock.h>

 #include "ram_vectors.h"

 #ifdef CONFIG_ARCH_RAMVECTORS

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static spinlock_t g_ramvec_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@ -68,7 +75,7 @@ int arm_ramvec_attach(int irq, up_vector_t vector)
       * common exception handler.
       */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_ramvec_lock);
      if (vector == NULL)
        {
          /* Disable the interrupt if we can before detaching it.  We might
@ -87,7 +94,7 @@ int arm_ramvec_attach(int irq, up_vector_t vector)
      /* Save the new vector in the vector table */

      g_ram_vectors[irq] = vector;
-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_ramvec_lock, flags);
      ret = OK;
    }

--- a/arch/arm/src/armv6-m/arm_schedulesigaction.c
+++ b/arch/arm/src/armv6-m/arm_schedulesigaction.c
@ -37,6 +37,7 @@
 #include "psr.h"
 #include "exc_return.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"
 #include "irq/irq.h"
 #include "nvic.h"
@ -96,8 +97,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
       * REVISIT:  Signal handle will run in a critical section!
       */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }
  else if (tcb == rtcb && ipsr != NVIC_IRQ_PENDSV)
    {
--- a/arch/arm/src/armv6-m/arm_sigdeliver.c
+++ b/arch/arm/src/armv6-m/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -69,9 +70,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 retry:
 #ifdef CONFIG_SMP
@ -103,7 +104,7 @@ retry:

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -150,7 +151,9 @@ retry:
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of
   * execution.
--- a/arch/arm/src/armv7-a/Toolchain.defs
+++ b/arch/arm/src/armv7-a/Toolchain.defs
@ -35,7 +35,7 @@ else ifeq ($(CONFIG_ARCH_CORTEXA9),y)
 endif

 ifeq ($(CONFIG_ARM_THUMB),y)
-  LLVM_ARCHTYPE := thumbv7
+  LLVM_ARCHTYPE := thumbv7a
 else
  LLVM_ARCHTYPE := armv7a
 endif
--- a/arch/arm/src/armv7-a/arm_l2cc_pl310.c
+++ b/arch/arm/src/armv7-a/arm_l2cc_pl310.c
@ -38,6 +38,7 @@
 #include <debug.h>

 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>

 #include "arm_internal.h"
 #include "barriers.h"
@ -225,6 +226,12 @@

 #define PL310_GULP_SIZE            4096

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static spinlock_t g_l2cc_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Private Functions
 ****************************************************************************/
@ -262,6 +269,66 @@ static void pl310_flush_all(void)
  putreg32(0, L2CC_CSR);
 }

+/****************************************************************************
+ * Name: l2cc_disable_nolock
+ *
+ * Description:
+ *    Disable the L2CC-P310 L2 cache by clearing the Control Register (CR)
+ *
+ * Input Parameters:
+ *    None
+ *
+ * Returned Value:
+ *    None
+ *
+ ****************************************************************************/
+
+static void l2cc_disable_nolock(void)
+{
+  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */
+
+  pl310_flush_all();
+
+  /* Disable the L2CC-P310 L2 cache by clearing the Control Register (CR) */
+
+  putreg32(0, L2CC_CR);
+  ARM_DSB();
+  ARM_ISB();
+}
+
+/****************************************************************************
+ * Name: l2cc_invalidate_all_nolock
+ *
+ * Description:
+ *   Invalidate all ways using the Invalidate Way Register (IWR).
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static void l2cc_invalidate_all_nolock(void)
+{
+  /* Invalidate all ways by writing the bit mask of ways to be invalidated
+   * the Invalidate Way Register (IWR).
+   */
+
+  putreg32(PL310_WAY_MASK, L2CC_IWR);
+
+  /* Wait for cache operation by way to complete */
+
+  while ((getreg32(L2CC_IWR) & PL310_WAY_MASK) != 0);
+
+  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
+   * EB, are empty.
+   */
+
+  putreg32(0, L2CC_CSR);
+}
+
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@ -457,18 +524,18 @@ void l2cc_enable(void)

  /* Invalidate and enable the cache (must be disabled to do this!) */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);

  if ((getreg32(L2CC_CR) & L2CC_CR_L2CEN) != 0)
    {
-      l2cc_disable();
+      l2cc_disable_nolock();
    }

-  l2cc_invalidate_all();
+  l2cc_invalidate_all_nolock();
  putreg32(L2CC_CR_L2CEN, L2CC_CR);
  ARM_DSB();
  ARM_ISB();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -489,17 +556,11 @@ void l2cc_disable(void)
 {
  irqstate_t flags;

-  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */
+  flags = spin_lock_irqsave(&g_l2cc_lock);

-  flags = enter_critical_section();
-  pl310_flush_all();
+  l2cc_disable_nolock();

-  /* Disable the L2CC-P310 L2 cache by clearing the Control Register (CR) */
-
-  putreg32(0, L2CC_CR);
-  ARM_DSB();
-  ARM_ISB();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -525,9 +586,9 @@ void l2cc_sync(void)
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -548,27 +609,11 @@ void l2cc_invalidate_all(void)
 {
  irqstate_t flags;

-  /* Invalidate all ways */
+  flags = spin_lock_irqsave(&g_l2cc_lock);

-  flags = enter_critical_section();
+  l2cc_invalidate_all_nolock();

-  /* Invalidate all ways by writing the bit mask of ways to be invalidated
-   * the Invalidate Way Register (IWR).
-   */
-
-  putreg32(PL310_WAY_MASK, L2CC_IWR);
-
-  /* Wait for cache operation by way to complete */
-
-  while ((getreg32(L2CC_IWR) & PL310_WAY_MASK) != 0);
-
-  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
-   * EB, are empty.
-   */
-
-  putreg32(0, L2CC_CSR);
-
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -595,7 +640,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

  /* Check if the start address is aligned with a cacheline */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  if ((startaddr & PL310_CACHE_LINE_MASK) != 0)
    {
      /* No.. align down and flush the cache line by writing the address to
@ -622,7 +667,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)
      putreg32(endaddr, L2CC_CIPALR);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);

  /* Loop, invalidated the address range by cache line.  Interrupts are re-
   * enabled momentarily every PL310_GULP_SIZE bytes.
@ -640,7 +685,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

      /* Disable interrupts and invalidate the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Invalidate the cache line by writing the address to the
@ -656,16 +701,16 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -690,7 +735,7 @@ void l2cc_clean_all(void)
   * Ways Register (CWR).
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(PL310_WAY_MASK, L2CC_CWR);

  /* Wait for cache operation by way to complete */
@ -702,7 +747,7 @@ void l2cc_clean_all(void)
   */

  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -758,7 +803,7 @@ void l2cc_clean(uintptr_t startaddr, uintptr_t endaddr)

      /* Disable interrupts and clean the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Clean the cache line by writing the address to the Clean
@ -774,16 +819,16 @@ void l2cc_clean(uintptr_t startaddr, uintptr_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -806,9 +851,9 @@ void l2cc_flush_all(void)

  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  pl310_flush_all();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -864,7 +909,7 @@ void l2cc_flush(uint32_t startaddr, uint32_t endaddr)

      /* Disable interrupts and flush the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Flush the cache line by writing the address to the Clean
@ -880,16 +925,16 @@ void l2cc_flush(uint32_t startaddr, uint32_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 #endif /* CONFIG_ARMV7A_L2CC_PL310 */
--- a/arch/arm/src/armv7-a/arm_schedulesigaction.c
+++ b/arch/arm/src/armv7-a/arm_schedulesigaction.c
@ -36,6 +36,7 @@

 #include "arm.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"
 #include "irq/irq.h"

@ -94,8 +95,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
       * REVISIT:  Signal handler will run in a critical section!
       */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }
  else
    {
--- a/arch/arm/src/armv7-a/arm_sigdeliver.c
+++ b/arch/arm/src/armv7-a/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -69,9 +70,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 retry:
 #ifdef CONFIG_SMP
@ -103,7 +104,7 @@ retry:

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -150,7 +151,9 @@ retry:
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of execution. */

--- a/arch/arm/src/armv7-a/arm_syscall.c
+++ b/arch/arm/src/armv7-a/arm_syscall.c
@ -410,7 +410,7 @@ uint32_t *arm_syscall(uint32_t *regs)

              /* Copy "info" into user stack */

-              if (rtcb->sigdeliver)
+              if ((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0)
                {
                  usp = rtcb->xcp.saved_regs[REG_SP];
                }
--- a/arch/arm/src/armv7-m/arm_doirq.c
+++ b/arch/arm/src/armv7-m/arm_doirq.c
@ -34,6 +34,7 @@
 #include <nuttx/board.h>
 #include <arch/board/board.h>
 #include <sched/sched.h>
+#include <signal/signal.h>

 #include "arm_internal.h"
 #include "exc_return.h"
@ -86,7 +87,7 @@ uint32_t *arm_doirq(int irq, uint32_t *regs)

      irq_dispatch(irq, regs);
 #endif
-      if (tcb->sigdeliver)
+      if ((tcb->flags & TCB_FLAG_SIGDELIVER) != 0)
        {
          /* Pendsv able to access running tcb with no critical section */

--- a/arch/arm/src/armv7-m/arm_ramvec_attach.c
+++ b/arch/arm/src/armv7-m/arm_ramvec_attach.c
@ -31,11 +31,18 @@

 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
+#include <nuttx/spinlock.h>

 #include "ram_vectors.h"

 #ifdef CONFIG_ARCH_RAMVECTORS

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static spinlock_t g_ramvec_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@ -68,7 +75,7 @@ int arm_ramvec_attach(int irq, up_vector_t vector)
       * common exception handler.
       */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_ramvec_lock);
      if (vector == NULL)
        {
          /* Disable the interrupt if we can before detaching it.  We might
@ -87,7 +94,7 @@ int arm_ramvec_attach(int irq, up_vector_t vector)
      /* Save the new vector in the vector table */

      g_ram_vectors[irq] = vector;
-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_ramvec_lock, flags);
      ret = OK;
    }

--- a/arch/arm/src/armv7-m/arm_schedulesigaction.c
+++ b/arch/arm/src/armv7-m/arm_schedulesigaction.c
@ -38,6 +38,7 @@
 #include "psr.h"
 #include "exc_return.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"
 #include "irq/irq.h"
 #include "nvic.h"
@ -97,8 +98,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
       * REVISIT:  Signal handle will run in a critical section!
       */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }
  else if (tcb == rtcb && ipsr != NVIC_IRQ_PENDSV)
    {
--- a/arch/arm/src/armv7-m/arm_sigdeliver.c
+++ b/arch/arm/src/armv7-m/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -69,9 +70,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 retry:
 #ifdef CONFIG_SMP
@ -103,7 +104,7 @@ retry:

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -150,7 +151,9 @@ retry:
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of
   * execution.
--- a/arch/arm/src/armv7-r/arm_l2cc_pl310.c
+++ b/arch/arm/src/armv7-r/arm_l2cc_pl310.c
@ -38,6 +38,7 @@
 #include <debug.h>

 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>

 #include "arm_internal.h"
 #include "barriers.h"
@ -225,6 +226,12 @@

 #define PL310_GULP_SIZE            4096

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static volatile spinlock_t g_l2cc_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Private Functions
 ****************************************************************************/
@ -262,6 +269,66 @@ static void pl310_flush_all(void)
  putreg32(0, L2CC_CSR);
 }

+/****************************************************************************
+ * Name: l2cc_disable_nolock
+ *
+ * Description:
+ *    Disable the L2CC-P310 L2 cache by clearing the Control Register (CR)
+ *
+ * Input Parameters:
+ *    None
+ *
+ * Returned Value:
+ *    None
+ *
+ ****************************************************************************/
+
+static void l2cc_disable_nolock(void)
+{
+  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */
+
+  pl310_flush_all();
+
+  /* Disable the L2CC-P310 L2 cache by clearing the Control Register (CR) */
+
+  putreg32(0, L2CC_CR);
+  ARM_DSB();
+  ARM_ISB();
+}
+
+/****************************************************************************
+ * Name: l2cc_invalidate_all_nolock
+ *
+ * Description:
+ *   Invalidate all ways using the Invalidate Way Register (IWR).
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static void l2cc_invalidate_all_nolock(void)
+{
+  /* Invalidate all ways by writing the bit mask of ways to be invalidated
+   * the Invalidate Way Register (IWR).
+   */
+
+  putreg32(PL310_WAY_MASK, L2CC_IWR);
+
+  /* Wait for cache operation by way to complete */
+
+  while ((getreg32(L2CC_IWR) & PL310_WAY_MASK) != 0);
+
+  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
+   * EB, are empty.
+   */
+
+  putreg32(0, L2CC_CSR);
+}
+
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@ -457,18 +524,18 @@ void l2cc_enable(void)

  /* Invalidate and enable the cache (must be disabled to do this!) */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);

  if ((getreg32(L2CC_CR) & L2CC_CR_L2CEN) != 0)
    {
-      l2cc_disable();
+      l2cc_disable_nolock();
    }

-  l2cc_invalidate_all();
+  l2cc_invalidate_all_nolock();
  putreg32(L2CC_CR_L2CEN, L2CC_CR);
  ARM_DSB();
  ARM_ISB();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -489,17 +556,11 @@ void l2cc_disable(void)
 {
  irqstate_t flags;

-  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */
+  flags = spin_lock_irqsave(&g_l2cc_lock);

-  flags = enter_critical_section();
-  pl310_flush_all();
+  l2cc_disable_nolock();

-  /* Disable the L2CC-P310 L2 cache by clearing the Control Register (CR) */
-
-  putreg32(0, L2CC_CR);
-  ARM_DSB();
-  ARM_ISB();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -525,9 +586,9 @@ void l2cc_sync(void)
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -548,27 +609,11 @@ void l2cc_invalidate_all(void)
 {
  irqstate_t flags;

-  /* Invalidate all ways */
+  flags = spin_lock_irqsave(&g_l2cc_lock);

-  flags = enter_critical_section();
+  l2cc_invalidate_all_nolock();

-  /* Invalidate all ways by writing the bit mask of ways to be invalidated
-   * the Invalidate Way Register (IWR).
-   */
-
-  putreg32(PL310_WAY_MASK, L2CC_IWR);
-
-  /* Wait for cache operation by way to complete */
-
-  while ((getreg32(L2CC_IWR) & PL310_WAY_MASK) != 0);
-
-  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
-   * EB, are empty.
-   */
-
-  putreg32(0, L2CC_CSR);
-
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -595,7 +640,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

  /* Check if the start address is aligned with a cacheline */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  if ((startaddr & PL310_CACHE_LINE_MASK) != 0)
    {
      /* No.. align down and flush the cache line by writing the address to
@ -622,7 +667,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)
      putreg32(endaddr, L2CC_CIPALR);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);

  /* Loop, invalidated the address range by cache line.  Interrupts are re-
   * enabled momentarily every PL310_GULP_SIZE bytes.
@ -640,7 +685,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

      /* Disable interrupts and invalidate the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Invalidate the cache line by writing the address to the
@ -656,16 +701,16 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -690,7 +735,7 @@ void l2cc_clean_all(void)
   * Ways Register (CWR).
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(PL310_WAY_MASK, L2CC_CWR);

  /* Wait for cache operation by way to complete */
@ -702,7 +747,7 @@ void l2cc_clean_all(void)
   */

  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -758,7 +803,7 @@ void l2cc_clean(uintptr_t startaddr, uintptr_t endaddr)

      /* Disable interrupts and clean the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Clean the cache line by writing the address to the Clean
@ -774,16 +819,16 @@ void l2cc_clean(uintptr_t startaddr, uintptr_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -806,9 +851,9 @@ void l2cc_flush_all(void)

  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  pl310_flush_all();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -864,7 +909,7 @@ void l2cc_flush(uint32_t startaddr, uint32_t endaddr)

      /* Disable interrupts and flush the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Flush the cache line by writing the address to the Clean
@ -880,16 +925,16 @@ void l2cc_flush(uint32_t startaddr, uint32_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 #endif /* CONFIG_ARMV7R_L2CC_PL310 */
--- a/arch/arm/src/armv7-r/arm_schedulesigaction.c
+++ b/arch/arm/src/armv7-r/arm_schedulesigaction.c
@ -35,6 +35,7 @@

 #include "arm.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -92,8 +93,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
       * REVISIT:  Signal handler will run in a critical section!
       */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }
  else
    {
--- a/arch/arm/src/armv7-r/arm_sigdeliver.c
+++ b/arch/arm/src/armv7-r/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -69,9 +70,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 retry:
 #ifdef CONFIG_SMP
@ -103,7 +104,7 @@ retry:

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -147,7 +148,9 @@ retry:
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of execution. */

--- a/arch/arm/src/armv7-r/arm_syscall.c
+++ b/arch/arm/src/armv7-r/arm_syscall.c
@ -407,7 +407,7 @@ uint32_t *arm_syscall(uint32_t *regs)

              /* Copy "info" into user stack */

-              if (rtcb->sigdeliver)
+              if ((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0)
                {
                  usp = rtcb->xcp.saved_regs[REG_SP];
                }
--- a/arch/arm/src/armv8-m/arm_doirq.c
+++ b/arch/arm/src/armv8-m/arm_doirq.c
@ -97,7 +97,7 @@ uint32_t *arm_doirq(int irq, uint32_t *regs)

      irq_dispatch(irq, regs);
 #endif
-      if (tcb->sigdeliver)
+      if ((tcb->flags & TCB_FLAG_SIGDELIVER) != 0)
        {
          /* Pendsv able to access running tcb with no critical section */

--- a/arch/arm/src/armv8-m/arm_ramvec_attach.c
+++ b/arch/arm/src/armv8-m/arm_ramvec_attach.c
@ -31,11 +31,18 @@

 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
+#include <nuttx/spinlock.h>

 #include "ram_vectors.h"

 #ifdef CONFIG_ARCH_RAMVECTORS

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static spinlock_t g_ramvec_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@ -68,7 +75,7 @@ int arm_ramvec_attach(int irq, up_vector_t vector)
       * common exception handler.
       */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_ramvec_lock);
      if (vector == NULL)
        {
          /* Disable the interrupt if we can before detaching it.  We might
@ -87,7 +94,7 @@ int arm_ramvec_attach(int irq, up_vector_t vector)
      /* Save the new vector in the vector table */

      g_ram_vectors[irq] = vector;
-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_ramvec_lock, flags);
      ret = OK;
    }

--- a/arch/arm/src/armv8-m/arm_schedulesigaction.c
+++ b/arch/arm/src/armv8-m/arm_schedulesigaction.c
@ -38,6 +38,7 @@
 #include "psr.h"
 #include "exc_return.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"
 #include "irq/irq.h"
 #include "nvic.h"
@ -97,8 +98,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
       * REVISIT:  Signal handle will run in a critical section!
       */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }
  else if (tcb == rtcb && ipsr != NVIC_IRQ_PENDSV)
    {
--- a/arch/arm/src/armv8-m/arm_sigdeliver.c
+++ b/arch/arm/src/armv8-m/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -69,9 +70,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 retry:
 #ifdef CONFIG_SMP
@ -103,7 +104,7 @@ retry:

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -150,7 +151,9 @@ retry:
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of
   * execution.
--- a/arch/arm/src/armv8-r/arm_l2cc_pl310.c
+++ b/arch/arm/src/armv8-r/arm_l2cc_pl310.c
@ -38,6 +38,7 @@
 #include <debug.h>

 #include <nuttx/irq.h>
+#include <nuttx/spinlock.h>

 #include "arm_internal.h"
 #include "barriers.h"
@ -225,6 +226,12 @@

 #define PL310_GULP_SIZE            4096

+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static volatile spinlock_t g_l2cc_lock = SP_UNLOCKED;
+
 /****************************************************************************
 * Private Functions
 ****************************************************************************/
@ -262,6 +269,66 @@ static void pl310_flush_all(void)
  putreg32(0, L2CC_CSR);
 }

+/****************************************************************************
+ * Name: l2cc_disable_nolock
+ *
+ * Description:
+ *    Disable the L2CC-P310 L2 cache by clearing the Control Register (CR)
+ *
+ * Input Parameters:
+ *    None
+ *
+ * Returned Value:
+ *    None
+ *
+ ****************************************************************************/
+
+static void l2cc_disable_nolock(void)
+{
+  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */
+
+  pl310_flush_all();
+
+  /* Disable the L2CC-P310 L2 cache by clearing the Control Register (CR) */
+
+  putreg32(0, L2CC_CR);
+  ARM_DSB();
+  ARM_ISB();
+}
+
+/****************************************************************************
+ * Name: l2cc_invalidate_all_nolock
+ *
+ * Description:
+ *   Invalidate all ways using the Invalidate Way Register (IWR).
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static void l2cc_invalidate_all_nolock(void)
+{
+  /* Invalidate all ways by writing the bit mask of ways to be invalidated
+   * the Invalidate Way Register (IWR).
+   */
+
+  putreg32(PL310_WAY_MASK, L2CC_IWR);
+
+  /* Wait for cache operation by way to complete */
+
+  while ((getreg32(L2CC_IWR) & PL310_WAY_MASK) != 0);
+
+  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
+   * EB, are empty.
+   */
+
+  putreg32(0, L2CC_CSR);
+}
+
 /****************************************************************************
 * Public Functions
 ****************************************************************************/
@ -457,18 +524,18 @@ void l2cc_enable(void)

  /* Invalidate and enable the cache (must be disabled to do this!) */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);

  if ((getreg32(L2CC_CR) & L2CC_CR_L2CEN) != 0)
    {
-      l2cc_disable();
+      l2cc_disable_nolock();
    }

-  l2cc_invalidate_all();
+  l2cc_invalidate_all_nolock();
  putreg32(L2CC_CR_L2CEN, L2CC_CR);
  ARM_DSB();
  ARM_ISB();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -489,17 +556,11 @@ void l2cc_disable(void)
 {
  irqstate_t flags;

-  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */
+  flags = spin_lock_irqsave(&g_l2cc_lock);

-  flags = enter_critical_section();
-  pl310_flush_all();
+  l2cc_disable_nolock();

-  /* Disable the L2CC-P310 L2 cache by clearing the Control Register (CR) */
-
-  putreg32(0, L2CC_CR);
-  ARM_DSB();
-  ARM_ISB();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -525,9 +586,9 @@ void l2cc_sync(void)
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -548,27 +609,11 @@ void l2cc_invalidate_all(void)
 {
  irqstate_t flags;

-  /* Invalidate all ways */
+  flags = spin_lock_irqsave(&g_l2cc_lock);

-  flags = enter_critical_section();
+  l2cc_invalidate_all_nolock();

-  /* Invalidate all ways by writing the bit mask of ways to be invalidated
-   * the Invalidate Way Register (IWR).
-   */
-
-  putreg32(PL310_WAY_MASK, L2CC_IWR);
-
-  /* Wait for cache operation by way to complete */
-
-  while ((getreg32(L2CC_IWR) & PL310_WAY_MASK) != 0);
-
-  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
-   * EB, are empty.
-   */
-
-  putreg32(0, L2CC_CSR);
-
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -595,7 +640,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

  /* Check if the start address is aligned with a cacheline */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  if ((startaddr & PL310_CACHE_LINE_MASK) != 0)
    {
      /* No.. align down and flush the cache line by writing the address to
@ -622,7 +667,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)
      putreg32(endaddr, L2CC_CIPALR);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);

  /* Loop, invalidated the address range by cache line.  Interrupts are re-
   * enabled momentarily every PL310_GULP_SIZE bytes.
@ -640,7 +685,7 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

      /* Disable interrupts and invalidate the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Invalidate the cache line by writing the address to the
@ -656,16 +701,16 @@ void l2cc_invalidate(uintptr_t startaddr, uintptr_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -690,7 +735,7 @@ void l2cc_clean_all(void)
   * Ways Register (CWR).
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(PL310_WAY_MASK, L2CC_CWR);

  /* Wait for cache operation by way to complete */
@ -702,7 +747,7 @@ void l2cc_clean_all(void)
   */

  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -758,7 +803,7 @@ void l2cc_clean(uintptr_t startaddr, uintptr_t endaddr)

      /* Disable interrupts and clean the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Clean the cache line by writing the address to the Clean
@ -774,16 +819,16 @@ void l2cc_clean(uintptr_t startaddr, uintptr_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -806,9 +851,9 @@ void l2cc_flush_all(void)

  /* Flush all ways using the Clean Invalidate Way Register (CIWR). */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  pl310_flush_all();
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 /****************************************************************************
@ -864,7 +909,7 @@ void l2cc_flush(uint32_t startaddr, uint32_t endaddr)

      /* Disable interrupts and flush the gulp */

-      flags = enter_critical_section();
+      flags = spin_lock_irqsave(&g_l2cc_lock);
      while (startaddr < gulpend)
        {
          /* Flush the cache line by writing the address to the Clean
@ -880,16 +925,16 @@ void l2cc_flush(uint32_t startaddr, uint32_t endaddr)

      /* Enable interrupts momentarily */

-      leave_critical_section(flags);
+      spin_unlock_irqrestore(&g_l2cc_lock, flags);
    }

  /* Drain the STB. Operation complete when all buffers, LRB, LFB, STB, and
   * EB, are empty.
   */

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&g_l2cc_lock);
  putreg32(0, L2CC_CSR);
-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_l2cc_lock, flags);
 }

 #endif /* CONFIG_ARMV8R_L2CC_PL310 */
--- a/arch/arm/src/armv8-r/arm_schedulesigaction.c
+++ b/arch/arm/src/armv8-r/arm_schedulesigaction.c
@ -35,6 +35,7 @@

 #include "arm.h"
 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -92,8 +93,8 @@ void up_schedule_sigaction(struct tcb_s *tcb)
       * REVISIT:  Signal handler will run in a critical section!
       */

-      (tcb->sigdeliver)(tcb);
-      tcb->sigdeliver = NULL;
+      nxsig_deliver(tcb);
+      tcb->flags &= ~TCB_FLAG_SIGDELIVER;
    }
  else
    {
--- a/arch/arm/src/armv8-r/arm_sigdeliver.c
+++ b/arch/arm/src/armv8-r/arm_sigdeliver.c
@ -37,6 +37,7 @@
 #include <arch/board/board.h>

 #include "sched/sched.h"
+#include "signal/signal.h"
 #include "arm_internal.h"

 /****************************************************************************
@ -69,9 +70,9 @@ void arm_sigdeliver(void)

  board_autoled_on(LED_SIGNAL);

-  sinfo("rtcb=%p sigdeliver=%p sigpendactionq.head=%p\n",
-        rtcb, rtcb->sigdeliver, rtcb->sigpendactionq.head);
-  DEBUGASSERT(rtcb->sigdeliver != NULL);
+  sinfo("rtcb=%p sigpendactionq.head=%p\n",
+        rtcb, rtcb->sigpendactionq.head);
+  DEBUGASSERT((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0);

 retry:
 #ifdef CONFIG_SMP
@ -103,7 +104,7 @@ retry:

  /* Deliver the signal */

-  (rtcb->sigdeliver)(rtcb);
+  nxsig_deliver(rtcb);

  /* Output any debug messages BEFORE restoring errno (because they may
   * alter errno), then disable interrupts again and restore the original
@ -147,7 +148,9 @@ retry:
   * could be modified by a hostile program.
   */

-  rtcb->sigdeliver = NULL;  /* Allows next handler to be scheduled */
+  /* Allows next handler to be scheduled */
+
+  rtcb->flags &= ~TCB_FLAG_SIGDELIVER;

  /* Then restore the correct state for this thread of execution. */

--- a/arch/arm/src/armv8-r/arm_syscall.c
+++ b/arch/arm/src/armv8-r/arm_syscall.c
@ -407,7 +407,7 @@ uint32_t *arm_syscall(uint32_t *regs)

              /* Copy "info" into user stack */

-              if (rtcb->sigdeliver)
+              if ((rtcb->flags & TCB_FLAG_SIGDELIVER) != 0)
                {
                  usp = rtcb->xcp.saved_regs[REG_SP];
                }
--- a/arch/arm/src/at32/at32_adc.c
+++ b/arch/arm/src/at32/at32_adc.c
@ -36,7 +36,6 @@
 #include <errno.h>
 #include <assert.h>
 #include <debug.h>
-#include <unistd.h>

 #include <arch/board/board.h>
 #include <nuttx/irq.h>
--- a/arch/arm/src/at32/at32_eth.c
+++ b/arch/arm/src/at32/at32_eth.c
@ -34,7 +34,6 @@
 #include <string.h>
 #include <assert.h>
 #include <debug.h>
-#include <assert.h>
 #include <errno.h>

 #include <arpa/inet.h>
--- a/arch/arm/src/cmake/armv6-m.cmake
+++ b/arch/arm/src/cmake/armv6-m.cmake
@ -21,3 +21,8 @@
 # ##############################################################################

 add_compile_options(-mcpu=cortex-m0 -mthumb -mfloat-abi=soft)
+
+# LLVM Configuration
+set(LLVM_ARCHTYPE thumbv6m)
+set(LLVM_ABITYPE eabi)
+set(LLVM_CPUTYPE cortex-m0)
--- a/arch/arm/src/cmake/armv7-a.cmake
+++ b/arch/arm/src/cmake/armv7-a.cmake
@ -24,24 +24,43 @@ set(PLATFORM_FLAGS)

 if(CONFIG_ARCH_CORTEXA5)
  list(APPEND PLATFORM_FLAGS -mcpu=cortex-a5)
+  set(LLVM_CPUTYPE cortex-a5)
 elseif(CONFIG_ARCH_CORTEXA7)
  list(APPEND PLATFORM_FLAGS -mcpu=cortex-a7)
+  set(LLVM_CPUTYPE cortex-a7)
 elseif(CONFIG_ARCH_CORTEXA8)
  list(APPEND PLATFORM_FLAGS -mcpu=cortex-a8)
+  set(LLVM_CPUTYPE cortex-a8)
 elseif(CONFIG_ARCH_CORTEXA9)
  list(APPEND PLATFORM_FLAGS -mcpu=cortex-a9)
+  set(LLVM_CPUTYPE cortex-a9)
+endif()
+
+if(CONFIG_ARM_THUMB)
+  set(LLVM_ARCHTYPE thumbv7a)
+else()
+  set(LLVM_ARCHTYPE armv7-a)
+endif()
+
+if(CONFIG_ARCH_FPU)
+  set(LLVM_ABITYPE eabihf)
+else()
+  set(LLVM_ABITYPE eabi)
 endif()

 if(NOT CONFIG_ARM_DPFPU32)
  set(ARCHFPUD16 -d16)
 endif()

-# Cortex-A5  | -mfpu=vfpv4-fp16 | -mfpu=vfpv4-d16-fp16 | -mfpu=neon-fp16
-# Cortex-A7  | -mfpu=vfpv4      | -mfpu=vfpv4-d16      | -mfpu=neon-vfpv4
-# Cortex-A8  | -mfpu=vfpv3      |                      | -mfpu=neon (alias for
-# neon-vfpv3) Cortex-A9  | -mfpu=vfpv3-fp16 | -mfpu=vfpv3-d16-fp16 |
-# -mfpu=neon-fp16 Cortex-A15 | -mfpu=vfpv4      |                      |
-# -mfpu=neon-vfpv4
+# ~~~
+# | Cortex | FPU Option 1       | FPU Option 2           | FPU Option 3          |
+# |--------|--------------------|------------------------|-----------------------|
+# | A5     | -mfpu=vfpv4-fp16   | -mfpu=vfpv4-d16-fp16   | -mfpu=neon-fp16       |
+# | A7     | -mfpu=vfpv4        | -mfpu=vfpv4-d16        | -mfpu=neon-vfpv4      |
+# | A8     | -mfpu=vfpv3        |                        | -mfpu=neon (alias for neon-vfpv3) |
+# | A9     | -mfpu=vfpv3-fp16   | -mfpu=vfpv3-d16-fp16   | -mfpu=neon-fp16       |
+# | A15    | -mfpu=vfpv4        |                        | -mfpu=neon-vfpv4      |
+# ~~~

 if(CONFIG_ARCH_FPU)
  if(CONFIG_ARM_FPU_ABI_SOFT)
--- a/arch/arm/src/cmake/armv7-m.cmake
+++ b/arch/arm/src/cmake/armv7-m.cmake
@ -38,4 +38,23 @@ else() # gcc
  set(TOOLCHAIN_ARCH_FILE armv7-m_gcc)
 endif()

+# LLVM Configuration
+if(CONFIG_ARCH_CORTEXM3)
+  set(LLVM_ARCHTYPE thumbv7m)
+  set(LLVM_CPUTYPE cortex-m3)
+else()
+  set(LLVM_ARCHTYPE thumbv7em)
+  if(CONFIG_ARCH_CORTEXM4)
+    set(LLVM_CPUTYPE cortex-m4)
+  elseif(CONFIG_ARCH_CORTEXM7)
+    set(LLVM_CPUTYPE cortex-m7)
+  endif()
+endif()
+
+if(CONFIG_ARCH_FPU)
+  set(LLVM_ABITYPE eabihf)
+else()
+  set(LLVM_ABITYPE eabi)
+endif()
+
 include(${TOOLCHAIN_ARCH_FILE})
--- a/arch/arm/src/cmake/armv8-m.cmake
+++ b/arch/arm/src/cmake/armv8-m.cmake
@ -22,6 +22,31 @@

 set(PLATFORM_FLAGS)

+# LLVM Configuration
+if(CONFIG_ARCH_CORTEXM23)
+  set(LLVM_ARCHTYPE thumbv8m.base)
+  set(LLVM_CPUTYPE cortex-m23)
+elseif(CONFIG_ARCH_CORTEXM33)
+  set(LLVM_ARCHTYPE thumbv8m.main)
+  set(LLVM_CPUTYPE cortex-m33)
+elseif(CONFIG_ARCH_CORTEXM35P)
+  set(LLVM_ARCHTYPE thumbv8m.main)
+  set(LLVM_CPUTYPE cortex-m35p)
+elseif(CONFIG_ARCH_CORTEXM55)
+  set(LLVM_ARCHTYPE thumbv8.1m.main)
+  set(LLVM_CPUTYPE cortex-m55)
+elseif(CONFIG_ARCH_CORTEXM85)
+  set(LLVM_ARCHTYPE thumbv8.1m.main)
+  set(LLVM_CPUTYPE cortex-m85)
+endif()
+
+# Set ABI type based on FPU configuration
+if(CONFIG_ARCH_FPU)
+  set(LLVM_ABITYPE eabihf)
+else()
+  set(LLVM_ABITYPE eabi)
+endif()
+
 if(CONFIG_ARM_DSP)
  set(EXTCPUFLAGS +dsp)
 endif()
--- a/arch/arm/src/common/Toolchain.defs
+++ b/arch/arm/src/common/Toolchain.defs
@ -546,7 +546,9 @@ ifeq ($(CONFIG_PIC),y)
  # Generate an executable elf, need to ignore undefined symbols
  LDELFFLAGS += --unresolved-symbols=ignore-in-object-files --emit-relocs
 else
-  LDELFFLAGS += -r
+  ifneq ($(CONFIG_BINFMT_ELF_EXECUTABLE),y)
+    LDELFFLAGS += -r
+  endif
 endif

 LDELFFLAGS +=  -e main -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)modlib$(DELIM)gnu-elf.ld)
--- a/arch/arm/src/common/arm_registerdump.c
+++ b/arch/arm/src/common/arm_registerdump.c
@ -43,16 +43,6 @@
 * Public Functions
 ****************************************************************************/

-/****************************************************************************
- * Name: up_getusrsp
- ****************************************************************************/
-
-uintptr_t up_getusrsp(void *regs)
-{
-  uint32_t *ptr = regs;
-  return ptr[REG_SP];
-}
-
 /****************************************************************************
 * Name: up_dump_register
 ****************************************************************************/
--- a/arch/arm/src/cxd56xx/cxd56_charger.c
+++ b/arch/arm/src/cxd56xx/cxd56_charger.c
@ -29,7 +29,6 @@

 #include <nuttx/config.h>
 #include <assert.h>
-#include <debug.h>

 #include <sys/types.h>
 #include <stdio.h>
--- a/arch/arm/src/cxd56xx/cxd56_gauge.c
+++ b/arch/arm/src/cxd56xx/cxd56_gauge.c
@ -27,7 +27,6 @@
 ****************************************************************************/

 #include <nuttx/config.h>
-#include <debug.h>

 #include <sys/types.h>
 #include <stdio.h>
--- a/arch/arm/src/cxd56xx/cxd56_rtc.c
+++ b/arch/arm/src/cxd56xx/cxd56_rtc.c
@ -399,10 +399,14 @@ time_t up_rtc_time(void)
 #ifdef CONFIG_RTC_HIRES
 int up_rtc_gettime(struct timespec *tp)
 {
+  irqstate_t flags;
  uint64_t count;

-  count = cxd56_rtc_count();
+  flags = spin_lock_irqsave(&g_rtc_lock);
+
+  count = cxd56_rtc_count_nolock();
  count += g_rtc_save->offset;
+  spin_unlock_irqrestore(&g_rtc_lock, flags);

  /* Then we can save the time in seconds and fractional seconds. */

@ -477,21 +481,28 @@ int up_rtc_settime(const struct timespec *tp)
 *
 ****************************************************************************/

-uint64_t cxd56_rtc_count(void)
+uint64_t cxd56_rtc_count_nolock(void)
 {
  uint64_t val;
-  irqstate_t flags;

  /* The pre register is latched with reading the post rtcounter register,
   * so these registers always have to been read in the below order,
   * 1st post -> 2nd pre, and should be operated in atomic.
   */

-  flags = spin_lock_irqsave(&g_rtc_lock);
-
  val = (uint64_t)getreg32(CXD56_RTC0_RTPOSTCNT) << 15;
  val |= getreg32(CXD56_RTC0_RTPRECNT);

+  return val;
+}
+
+uint64_t cxd56_rtc_count(void)
+{
+  uint64_t val;
+  irqstate_t flags;
+
+  flags = spin_lock_irqsave(&g_rtc_lock);
+  val = cxd56_rtc_count_nolock();
  spin_unlock_irqrestore(&g_rtc_lock, flags);

  return val;
--- a/arch/arm/src/cxd56xx/cxd56_rtc.h
+++ b/arch/arm/src/cxd56xx/cxd56_rtc.h
@ -92,6 +92,7 @@ extern "C"
 ****************************************************************************/

 uint64_t cxd56_rtc_count(void);
+uint64_t cxd56_rtc_count_nolock(void);

 /****************************************************************************
 * Name: cxd56_rtc_almcount
--- a/arch/arm/src/efm32/efm32_adc.c
+++ b/arch/arm/src/efm32/efm32_adc.c
@ -35,7 +35,6 @@
 #include <errno.h>
 #include <assert.h>
 #include <debug.h>
-#include <unistd.h>

 #include <arch/board/board.h>
 #include <nuttx/irq.h>
--- a/arch/arm/src/efm32/efm32_irq.c
+++ b/arch/arm/src/efm32/efm32_irq.c
@ -33,7 +33,6 @@

 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
-#include <nuttx/irq.h>
 #include <arch/armv7-m/nvicpri.h>

 #include "nvic.h"
--- a/arch/arm/src/efm32/efm32_leserial.c
+++ b/arch/arm/src/efm32/efm32_leserial.c
@ -134,6 +134,7 @@ struct efm32_leuart_s
 {
  const struct efm32_config_s *config;
  uint16_t  ien;       /* Interrupts enabled */
+  spinlock_t lock;     /* Spinlock */
 };

 /****************************************************************************
@ -212,6 +213,7 @@ static const struct efm32_config_s g_leuart0config =
 static struct efm32_leuart_s g_leuart0priv =
 {
  .config    = &g_leuart0config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_leuart0port =
@ -247,6 +249,7 @@ static struct efm32_config_s g_leuart1config =
 static struct efm32_leuart_s g_leuart1priv =
 {
  .config    = &g_leuart1config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_leuart1port =
@ -303,6 +306,17 @@ static inline void efm32_setuartint(struct efm32_leuart_s *priv)
 * Name: efm32_restoreuartint
 ****************************************************************************/

+static void efm32_restoreuartint_nolock(struct efm32_leuart_s *priv,
+                                        uint32_t ien)
+{
+  /* Re-enable/re-disable interrupts corresponding to the state of
+   * bits in ien.
+   */
+
+  priv->ien = ien;
+  efm32_setuartint(priv);
+}
+
 static void efm32_restoreuartint(struct efm32_leuart_s *priv, uint32_t ien)
 {
  irqstate_t flags;
@ -311,10 +325,9 @@ static void efm32_restoreuartint(struct efm32_leuart_s *priv, uint32_t ien)
   * bits in ien.
   */

-  flags     = spin_lock_irqsave(NULL);
-  priv->ien = ien;
-  efm32_setuartint(priv);
-  spin_unlock_irqrestore(NULL, flags);
+  flags = spin_lock_irqsave(&priv->lock);
+  efm32_restoreuartint_nolock(priv, ien);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
@ -325,14 +338,14 @@ static void efm32_disableuartint(struct efm32_leuart_s *priv, uint32_t *ien)
 {
  irqstate_t flags;

-  flags = spin_lock_irqsave(NULL);
+  flags = spin_lock_irqsave(&priv->lock);
  if (ien)
    {
      *ien = priv->ien;
    }

-  efm32_restoreuartint(priv, 0);
-  spin_unlock_irqrestore(NULL, flags);
+  efm32_restoreuartint_nolock(priv, 0);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
@ -607,7 +620,7 @@ static void efm32_rxint(struct uart_dev_s *dev, bool enable)
  struct efm32_leuart_s *priv = (struct efm32_leuart_s *)dev->priv;
  irqstate_t flags;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&priv->lock);
  if (enable)
    {
      /* Receive an interrupt when there is anything in the Rx data register
@ -625,7 +638,7 @@ static void efm32_rxint(struct uart_dev_s *dev, bool enable)
      efm32_setuartint(priv);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
@ -673,7 +686,7 @@ static void efm32_txint(struct uart_dev_s *dev, bool enable)
  struct efm32_leuart_s *priv = (struct efm32_leuart_s *)dev->priv;
  irqstate_t flags;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&priv->lock);
  if (enable)
    {
      /* Enable the TX interrupt */
@ -697,7 +710,7 @@ static void efm32_txint(struct uart_dev_s *dev, bool enable)
      efm32_setuartint(priv);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
--- a/arch/arm/src/efm32/efm32_serial.c
+++ b/arch/arm/src/efm32/efm32_serial.c
@ -223,6 +223,7 @@ struct efm32_usart_s
  const struct efm32_config_s *config;
 #endif
  uint16_t ien;        /* Interrupts enabled */
+  spinlock_t lock;     /* Spinlock */
 };

 /****************************************************************************
@ -303,7 +304,7 @@ static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
 /* This describes the state of the EFM32 USART0 port. */

 #ifdef CONFIG_EFM32_USART0_ISUART
-static const struct efm32_usart_s g_usart0config =
+static const struct efm32_config_s g_usart0config =
 {
  .uartbase  = EFM32_USART0_BASE,
  .baud      = CONFIG_USART0_BAUD,
@ -317,6 +318,7 @@ static const struct efm32_usart_s g_usart0config =
 static struct efm32_usart_s g_usart0priv =
 {
  .config    = &g_usart0config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_usart0port =
@ -353,6 +355,7 @@ static struct efm32_config_s g_usart1config =
 static struct efm32_usart_s g_usart1priv =
 {
  .config    = &g_usart1config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_usart1port =
@ -389,6 +392,7 @@ static struct efm32_config_s g_usart2config =
 static struct efm32_usart_s g_usart2priv =
 {
  .config    = &g_usart2config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_usart2port =
@ -425,6 +429,7 @@ static struct efm32_config_s g_uart0config =
 static struct efm32_usart_s g_uart0priv =
 {
  .config    = &g_uart0config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_uart0port =
@ -447,7 +452,7 @@ static struct uart_dev_s g_uart0port =
 /* This describes the state of the EFM32 UART1 port. */

 #ifdef CONFIG_EFM32_UART1
-static struct efm32_usart_s g_uart1config =
+static struct efm32_config_s g_uart1config =
 {
  .uartbase  = EFM32_UART1_BASE,
  .baud      = CONFIG_UART1_BAUD,
@ -461,6 +466,7 @@ static struct efm32_usart_s g_uart1config =
 static struct efm32_usart_s g_uart1priv =
 {
  .config    = &g_uart1config,
+  .lock      = SP_UNLOCKED
 };

 static struct uart_dev_s g_uart1port =
@ -516,6 +522,13 @@ static inline void efm32_setuartint(struct efm32_usart_s *priv)
 * Name: efm32_restoreuartint
 ****************************************************************************/

+static void efm32_restoreuartint_nolock(struct efm32_usart_s *priv,
+                                        uint32_t ien)
+{
+  priv->ien = ien;
+  efm32_setuartint(priv);
+}
+
 static void efm32_restoreuartint(struct efm32_usart_s *priv, uint32_t ien)
 {
  irqstate_t flags;
@ -524,10 +537,9 @@ static void efm32_restoreuartint(struct efm32_usart_s *priv, uint32_t ien)
   * ien
   */

-  flags     = spin_lock_irqsave(NULL);
-  priv->ien = ien;
-  efm32_setuartint(priv);
-  spin_unlock_irqrestore(NULL, flags);
+  flags = spin_lock_irqsave(&priv->lock);
+  efm32_restoreuartint_nolock(priv, len);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
@ -539,14 +551,14 @@ static void efm32_disableuartint(struct efm32_usart_s *priv, uint32_t *ien)
 {
  irqstate_t flags;

-  flags = spin_lock_irqsave(NULL);
+  flags = spin_lock_irqsave(&priv->lock);
  if (ien)
    {
      *ien = priv->ien;
    }

-  efm32_restoreuartint(priv, 0);
-  spin_unlock_irqrestore(NULL, flags);
+  efm32_restoreuartint_nolock(priv, 0);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }
 #endif

@ -966,7 +978,7 @@ static void efm32_rxint(struct uart_dev_s *dev, bool enable)
  struct efm32_usart_s *priv = (struct efm32_usart_s *)dev->priv;
  irqstate_t flags;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&priv->lock);
  if (enable)
    {
      /* Receive an interrupt when their is anything in the Rx data register
@ -984,7 +996,7 @@ static void efm32_rxint(struct uart_dev_s *dev, bool enable)
      efm32_setuartint(priv);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
@ -1032,7 +1044,7 @@ static void efm32_txint(struct uart_dev_s *dev, bool enable)
  struct efm32_usart_s *priv = (struct efm32_usart_s *)dev->priv;
  irqstate_t flags;

-  flags = enter_critical_section();
+  flags = spin_lock_irqsave(&priv->lock);
  if (enable)
    {
      /* Enable the TX interrupt */
@ -1056,7 +1068,7 @@ static void efm32_txint(struct uart_dev_s *dev, bool enable)
      efm32_setuartint(priv);
    }

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
--- a/arch/arm/src/eoss3/eoss3_irq.c
+++ b/arch/arm/src/eoss3/eoss3_irq.c
@ -33,7 +33,6 @@

 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
-#include <nuttx/irq.h>
 #include <arch/armv7-m/nvicpri.h>

 #include "nvic.h"
--- a/arch/arm/src/gd32f4/gd32f4xx_serial.c
+++ b/arch/arm/src/gd32f4/gd32f4xx_serial.c
@ -158,6 +158,7 @@ struct up_dev_s
  const uint8_t   stop_2bits;    /* True: Configure with 2 stop bits instead of 1 */
  const uint32_t  tx_gpio;       /* USART TX GPIO pin configuration */
  const uint32_t  rx_gpio;       /* USART RX GPIO pin configuration */
+  spinlock_t      lock;          /* Spinlock */

 #  ifdef CONFIG_SERIAL_IFLOWCONTROL
  const uint32_t  rts_gpio;      /* UART RTS GPIO pin configuration */
@ -437,6 +438,7 @@ static struct up_dev_s g_usart0priv =

  .tx_gpio       = GPIO_USART0_TX,
  .rx_gpio       = GPIO_USART0_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART0_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_USART0_RTS,
@ -509,6 +511,7 @@ static struct up_dev_s g_usart1priv =

  .tx_gpio       = GPIO_USART1_TX,
  .rx_gpio       = GPIO_USART1_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART1_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_USART1_RTS,
@ -581,6 +584,7 @@ static struct up_dev_s g_usart2priv =

  .tx_gpio       = GPIO_USART2_TX,
  .rx_gpio       = GPIO_USART2_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART2_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_USART2_RTS,
@ -653,6 +657,7 @@ static struct up_dev_s g_usart5priv =

  .tx_gpio       = GPIO_USART5_TX,
  .rx_gpio       = GPIO_USART5_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART5_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_USART5_RTS,
@ -725,6 +730,7 @@ static struct up_dev_s g_uart3priv =

  .tx_gpio       = GPIO_UART3_TX,
  .rx_gpio       = GPIO_UART3_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART3_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_UART3_RTS,
@ -797,6 +803,7 @@ static struct up_dev_s g_uart4priv =

  .tx_gpio       = GPIO_UART4_TX,
  .rx_gpio       = GPIO_UART4_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART4_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_UART4_RTS,
@ -869,6 +876,7 @@ static struct up_dev_s g_uart6priv =

  .tx_gpio       = GPIO_UART6_TX,
  .rx_gpio       = GPIO_UART6_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART6_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_UART6_RTS,
@ -941,6 +949,7 @@ static struct up_dev_s g_uart7priv =

  .tx_gpio       = GPIO_UART7_TX,
  .rx_gpio       = GPIO_UART7_RX,
+  .lock          = SP_UNLOCKED,
 #if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_UART7_IFLOWCONTROL)
  .iflow         = true,
  .rts_gpio      = GPIO_UART7_RTS,
@ -1127,7 +1136,7 @@ static void up_disableusartint(struct up_dev_s *priv, uint32_t *ie)
  irqstate_t flags;
  uint32_t ctl_ie;

-  flags = spin_lock_irqsave(NULL);
+  flags = spin_lock_irqsave(&priv->lock);

  if (ie)
    {
@ -1161,7 +1170,7 @@ static void up_disableusartint(struct up_dev_s *priv, uint32_t *ie)
  ctl_ie = (USART_CFG_CTL_MASK << USART_CFG_SHIFT);
  up_setusartint(priv, ctl_ie);

-  spin_unlock_irqrestore(NULL, flags);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
@ -1172,11 +1181,11 @@ static void up_restoreusartint(struct up_dev_s *priv, uint32_t ie)
 {
  irqstate_t flags;

-  flags = spin_lock_irqsave(NULL);
+  flags = spin_lock_irqsave(&priv->lock);

  up_setusartint(priv, ie);

-  spin_unlock_irqrestore(NULL, flags);
+  spin_unlock_irqrestore(&priv->lock, flags);
 }

 /****************************************************************************
--- a/arch/arm/src/imx9/imx9_edma.c
+++ b/arch/arm/src/imx9/imx9_edma.c
@ -145,6 +145,7 @@ struct imx9_edma_s
  /* This array describes each DMA channel */

  struct imx9_dmach_s dmach[IMX9_EDMA_NCHANNELS];
+  spinlock_t lock;
 };

 /****************************************************************************
@ -159,6 +160,7 @@ static struct imx9_edma_s g_edma =
 #if CONFIG_IMX9_EDMA_NTCD > 0
  .dsem = SEM_INITIALIZER(CONFIG_IMX9_EDMA_NTCD),
 #endif
+  .lock = SP_UNLOCKED
 };

 #if CONFIG_IMX9_EDMA_NTCD > 0
@ -198,15 +200,15 @@ static struct imx9_edmatcd_s *imx9_tcd_alloc(void)
   * waiting.
   */

-  flags = enter_critical_section();
  nxsem_wait_uninterruptible(&g_edma.dsem);

  /* Now there should be a TCD in the free list reserved just for us */

+  flags = spin_lock_irqsave(&g_edma.lock);
  tcd = (struct imx9_edmatcd_s *)sq_remfirst(&g_tcd_free);
  DEBUGASSERT(tcd != NULL);

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
  return tcd;
 }
 #endif
@ -220,6 +222,17 @@ static struct imx9_edmatcd_s *imx9_tcd_alloc(void)
 ****************************************************************************/

 #if CONFIG_IMX9_EDMA_NTCD > 0
+static void imx9_tcd_free_nolock(struct imx9_edmatcd_s *tcd)
+{
+  /* Add the the TCD to the end of the free list and post the 'dsem',
+   * possibly waking up another thread that might be waiting for
+   * a TCD.
+   */
+
+  sq_addlast((sq_entry_t *)tcd, &g_tcd_free);
+  nxsem_post(&g_edma.dsem);
+}
+
 static void imx9_tcd_free(struct imx9_edmatcd_s *tcd)
 {
  irqstate_t flags;
@ -229,10 +242,11 @@ static void imx9_tcd_free(struct imx9_edmatcd_s *tcd)
   * a TCD.
   */

-  flags = spin_lock_irqsave(NULL);
-  sq_addlast((sq_entry_t *)tcd, &g_tcd_free);
-  nxsem_post(&g_edma.dsem);
-  spin_unlock_irqrestore(NULL, flags);
+  flags = spin_lock_irqsave(&g_edma.lock);
+  sched_lock();
+  imx9_tcd_free_nolock(tcd);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
+  sched_unlock();
 }
 #endif

@ -458,6 +472,11 @@ static void imx9_dmaterminate(struct imx9_dmach_s *dmach, int result)
  edma_callback_t callback;
  void *arg;

+  irqstate_t flags;
+
+  flags = spin_lock_irqsave(&g_edma.lock);
+  sched_lock();
+
  /* Disable channel IRQ requests */

  putreg32(EDMA_CH_INT, base + IMX9_EDMA_CH_INT_OFFSET);
@ -487,7 +506,7 @@ static void imx9_dmaterminate(struct imx9_dmach_s *dmach, int result)
       next = dmach->flags & EDMA_CONFIG_LOOPDEST ?
              NULL : (struct imx9_edmatcd_s *)((uintptr_t)tcd->dlastsga);

-       imx9_tcd_free(tcd);
+       imx9_tcd_free_nolock(tcd);
    }

  dmach->head = NULL;
@ -507,6 +526,9 @@ static void imx9_dmaterminate(struct imx9_dmach_s *dmach, int result)
    {
      callback((DMACH_HANDLE)dmach, arg, true, result);
    }
+
+  spin_unlock_irqrestore(&g_edma.lock, flags);
+  sched_unlock();
 }

 /****************************************************************************
@ -1344,7 +1366,7 @@ int imx9_dmach_start(DMACH_HANDLE handle, edma_callback_t callback,

  /* Save the callback info.  This will be invoked when the DMA completes */

-  flags           = spin_lock_irqsave(NULL);
+  flags           = spin_lock_irqsave(&g_edma.lock);
  dmach->callback = callback;
  dmach->arg      = arg;

@ -1363,7 +1385,7 @@ int imx9_dmach_start(DMACH_HANDLE handle, edma_callback_t callback,
      putreg32(regval, base + IMX9_EDMA_CH_CSR_OFFSET);
    }

-  spin_unlock_irqrestore(NULL, flags);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
  return OK;
 }

@ -1386,14 +1408,11 @@ int imx9_dmach_start(DMACH_HANDLE handle, edma_callback_t callback,
 void imx9_dmach_stop(DMACH_HANDLE handle)
 {
  struct imx9_dmach_s *dmach = (struct imx9_dmach_s *)handle;
-  irqstate_t flags;

  dmainfo("dmach: %p\n", dmach);
  DEBUGASSERT(dmach != NULL);

-  flags = spin_lock_irqsave(NULL);
  imx9_dmaterminate(dmach, -EINTR);
-  spin_unlock_irqrestore(NULL, flags);
 }

 /****************************************************************************
@ -1508,7 +1527,7 @@ void imx9_dmasample(DMACH_HANDLE handle, struct imx9_dmaregs_s *regs)

  /* eDMA Global Registers */

-  flags          = spin_lock_irqsave(NULL);
+  flags          = spin_lock_irqsave(&g_edma.lock);

  /* REVISIT: eDMA4 does not show INT_HIGH / HRS_HIGH values correctly */

@ -1542,7 +1561,7 @@ void imx9_dmasample(DMACH_HANDLE handle, struct imx9_dmaregs_s *regs)
      regs->dmamux = 0;
    }

-  spin_unlock_irqrestore(NULL, flags);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
 }
 #endif /* CONFIG_DEBUG_DMA */

--- a/arch/arm/src/imx9/imx9_lowputc.c
+++ b/arch/arm/src/imx9/imx9_lowputc.c
@ -41,7 +41,6 @@
 #include "imx9_clockconfig.h"
 #include "imx9_iomuxc.h"
 #include "hardware/imx9_clock.h"
-#include "hardware/imx9_pinmux.h"

 #include <arch/board/board.h> /* Include last:  has dependencies */

--- a/arch/arm/src/imx9/imx9_lpi2c.c
+++ b/arch/arm/src/imx9/imx9_lpi2c.c
@ -1103,7 +1103,7 @@ static void imx9_lpi2c_setclock(struct imx9_lpi2c_priv_s *priv,
                                            &src_freq);

          /* LPI2C output frequency = (Source Clock (Hz)/ 2^prescale) /
-           *   (CLKLO + 1 + CLKHI + 1 + ROUNDDOWN((2 + FILTSCL) / 2^prescale)
+           *   (CLKLO + 1 + CLKHI + 1 + ALIGN_DOWN((2 + FILTSCL)/2^prescale)
           *
           * Assume  CLKLO = 2 * CLKHI, SETHOLD = CLKHI, DATAVD = CLKHI / 2
           */
--- a/arch/arm/src/imxrt/Kconfig
+++ b/arch/arm/src/imxrt/Kconfig
@ -1871,12 +1871,28 @@ menuconfig IMXRT_FLEXSPI1
 	default n
 	select IMXRT_FLEXSPI

+menuconfig IMXRT_FLEXSPI1_XIP
+	bool "FLEXSPI1 is used for XIP"
+	default n
+	depends on IMXRT_FLEXSPI1
+	---help---
+		FlexSPI1 is used as XIP thus already
+		initialized by the bootloader
+
 menuconfig IMXRT_FLEXSPI2
 	bool "FLEXSPI2"
 	default n
 	select IMXRT_FLEXSPI
 	depends on IMXRT_HAVE_FLEXSPI2

+menuconfig IMXRT_FLEXSPI2_XIP
+	bool "FLEXSPI2 is used for XIP"
+	default n
+	depends on IMXRT_FLEXSPI2
+	---help---
+		FlexSPI2 is used as XIP thus already
+		initialized by the bootloader
+
 endmenu # FLEXSPI Peripherals

 menu "ADC Peripherals"
--- a/arch/arm/src/imxrt/imxrt_edma.c
+++ b/arch/arm/src/imxrt/imxrt_edma.c
@ -137,6 +137,7 @@ struct imxrt_edma_s
  /* These mutex protect the DMA channel and descriptor tables */

  mutex_t chlock;                 /* Protects channel table */
+  spinlock_t lock;
 #if CONFIG_IMXRT_EDMA_NTCD > 0
  sem_t dsem;                     /* Supports wait for free descriptors */
 #endif
@ -158,6 +159,7 @@ static struct imxrt_edma_s g_edma =
 #if CONFIG_IMXRT_EDMA_NTCD > 0
  .dsem = SEM_INITIALIZER(CONFIG_IMXRT_EDMA_NTCD),
 #endif
+  .lock = SP_UNLOCKED
 };

 #if CONFIG_IMXRT_EDMA_NTCD > 0
@ -197,15 +199,15 @@ static struct imxrt_edmatcd_s *imxrt_tcd_alloc(void)
   * waiting.
   */

-  flags = enter_critical_section();
  nxsem_wait_uninterruptible(&g_edma.dsem);

  /* Now there should be a TCD in the free list reserved just for us */

+  flags = spin_lock_irqsave(&g_edma.lock);
  tcd = (struct imxrt_edmatcd_s *)sq_remfirst(&g_tcd_free);
  DEBUGASSERT(tcd != NULL);

-  leave_critical_section(flags);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
  return tcd;
 }
 #endif
@ -219,6 +221,17 @@ static struct imxrt_edmatcd_s *imxrt_tcd_alloc(void)
 ****************************************************************************/

 #if CONFIG_IMXRT_EDMA_NTCD > 0
+static void imxrt_tcd_free_nolock(struct imxrt_edmatcd_s *tcd)
+{
+  /* Add the the TCD to the end of the free list and post the 'dsem',
+   * possibly waking up another thread that might be waiting for
+   * a TCD.
+   */
+
+  sq_addlast((sq_entry_t *)tcd, &g_tcd_free);
+  nxsem_post(&g_edma.dsem);
+}
+
 static void imxrt_tcd_free(struct imxrt_edmatcd_s *tcd)
 {
  irqstate_t flags;
@ -228,10 +241,9 @@ static void imxrt_tcd_free(struct imxrt_edmatcd_s *tcd)
   * a TCD.
   */

-  flags = spin_lock_irqsave(NULL);
-  sq_addlast((sq_entry_t *)tcd, &g_tcd_free);
-  nxsem_post(&g_edma.dsem);
-  spin_unlock_irqrestore(NULL, flags);
+  flags = spin_lock_irqsave(&g_edma.lock);
+  imxrt_tcd_free_nolock(tcd);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
 }
 #endif

@ -436,8 +448,11 @@ static void imxrt_dmaterminate(struct imxrt_dmach_s *dmach, int result)
  uint8_t regval8;
  uint8_t chan;
  edma_callback_t callback;
+  irqstate_t flags;
  void *arg;

+  flags = spin_lock_irqsave(&g_edma.lock);
+
  /* Disable channel ERROR interrupts */

  chan            = dmach->chan;
@ -469,7 +484,7 @@ static void imxrt_dmaterminate(struct imxrt_dmach_s *dmach, int result)
       next = dmach->flags & EDMA_CONFIG_LOOPDEST ?
              NULL : (struct imxrt_edmatcd_s *)tcd->dlastsga;

-       imxrt_tcd_free(tcd);
+       imxrt_tcd_free_nolock(tcd);
    }

  dmach->head = NULL;
@ -489,6 +504,8 @@ static void imxrt_dmaterminate(struct imxrt_dmach_s *dmach, int result)
    {
      callback((DMACH_HANDLE)dmach, arg, true, result);
    }
+
+  spin_unlock_irqrestore(&g_edma.lock, flags);
 }

 /****************************************************************************
@ -1143,7 +1160,7 @@ int imxrt_dmach_start(DMACH_HANDLE handle, edma_callback_t callback,

  /* Save the callback info.  This will be invoked when the DMA completes */

-  flags           = spin_lock_irqsave(NULL);
+  flags           = spin_lock_irqsave(&g_edma.lock);
  dmach->callback = callback;
  dmach->arg      = arg;

@ -1168,7 +1185,7 @@ int imxrt_dmach_start(DMACH_HANDLE handle, edma_callback_t callback,
      putreg8(regval8, IMXRT_EDMA_SERQ);
    }

-  spin_unlock_irqrestore(NULL, flags);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
  return OK;
 }

@ -1191,14 +1208,11 @@ int imxrt_dmach_start(DMACH_HANDLE handle, edma_callback_t callback,
 void imxrt_dmach_stop(DMACH_HANDLE handle)
 {
  struct imxrt_dmach_s *dmach = (struct imxrt_dmach_s *)handle;
-  irqstate_t flags;

  dmainfo("dmach: %p\n", dmach);
  DEBUGASSERT(dmach != NULL);

-  flags = spin_lock_irqsave(NULL);
  imxrt_dmaterminate(dmach, -EINTR);
-  spin_unlock_irqrestore(NULL, flags);
 }

 /****************************************************************************
@ -1313,7 +1327,7 @@ void imxrt_dmasample(DMACH_HANDLE handle, struct imxrt_dmaregs_s *regs)

  /* eDMA Global Registers */

-  flags          = spin_lock_irqsave(NULL);
+  flags          = spin_lock_irqsave(&g_edma.lock);

  regs->cr       = getreg32(IMXRT_EDMA_CR);   /* Control */
  regs->es       = getreg32(IMXRT_EDMA_ES);   /* Error Status */
@ -1348,7 +1362,7 @@ void imxrt_dmasample(DMACH_HANDLE handle, struct imxrt_dmaregs_s *regs)
  regaddr        = IMXRT_DMAMUX_CHCFG(chan);
  regs->dmamux   = getreg32(regaddr);         /* Channel configuration */

-  spin_unlock_irqrestore(NULL, flags);
+  spin_unlock_irqrestore(&g_edma.lock, flags);
 }
 #endif /* CONFIG_DEBUG_DMA */

--- a/arch/arm/src/imxrt/imxrt_flexspi.c
+++ b/arch/arm/src/imxrt/imxrt_flexspi.c
@ -83,6 +83,8 @@ static int imxrt_flexspi_lock(struct flexspi_dev_s *dev, bool lock);
 static int imxrt_flexspi_transfer_blocking(struct flexspi_dev_s *dev,
                                      struct flexspi_transfer_s *xfer);
 static void imxrt_flexspi_software_reset(struct flexspi_dev_s *dev);
+static void imxrt_flexspi_configure_prefetch(struct flexspi_dev_s *dev,
+                                             bool enable);
 static void imxrt_flexspi_update_lut(struct flexspi_dev_s *dev,
                                     uint32_t index,
                                     const uint32_t *cmd,
@ -102,6 +104,7 @@ static const struct flexspi_ops_s g_flexspi0ops =
  .lock              = imxrt_flexspi_lock,
  .transfer_blocking = imxrt_flexspi_transfer_blocking,
  .software_reset    = imxrt_flexspi_software_reset,
+  .configure_prefetch = imxrt_flexspi_configure_prefetch,
  .update_lut        = imxrt_flexspi_update_lut,
  .set_device_config  = imxrt_flexspi_set_device_config,
 };
@ -118,6 +121,9 @@ static struct imxrt_flexspidev_s g_flexspi0dev =
  },
  .base = (struct flexspi_type_s *)IMXRT_FLEXSPIC_BASE,
  .lock = NXMUTEX_INITIALIZER,
+#ifdef CONFIG_IMXRT_FLEXSPI1_XIP
+  .initialized = true,
+#endif
 };

 #endif
@ -131,6 +137,9 @@ static struct imxrt_flexspidev_s g_flexspi1dev =
    .ops = &g_flexspi0ops,
  },
  .base = (struct flexspi_type_s *) IMXRT_FLEXSPI2C_BASE,
+#ifdef CONFIG_IMXRT_FLEXSPI2_XIP
+  .initialized = true,
+#endif
 };

 #endif
@ -330,6 +339,31 @@ static inline void imxrt_flexspi_software_reset_private(
    }
 }

+/* Configure FLEXSPI preftech.
+ *
+ * This function enables/disabled the prefetcher
+ * Which is needed to do RWW see NXP AN12564
+ *
+ * @param base FLEXSPI peripheral base address.
+ */
+
+static inline void imxrt_flexspi_configure_prefetch_private(
+                        struct flexspi_type_s *base, bool enable)
+{
+  uint32_t config_value = base->AHBCR;
+
+  if (enable)
+    {
+      config_value |= FLEXSPI_AHBCR_PREFETCHEN(1);
+    }
+  else
+    {
+      config_value &= ~FLEXSPI_AHBCR_PREFETCHEN(1);
+    }
+
+  base->AHBCR = config_value;
+}
+
 /* Returns whether the bus is idle.
 *
 * @param base FLEXSPI peripheral base address.
@ -1173,6 +1207,29 @@ static void imxrt_flexspi_software_reset(struct flexspi_dev_s *dev)
  imxrt_flexspi_software_reset_private(priv->base);
 }

+/****************************************************************************
+ * Name: imxrt_flexspi_configure_prefetch
+ *
+ * Description:
+ *   Configures prefetch
+ *
+ * Input Parameters:
+ *   dev  - Device-specific state data
+ *   enable - Enable prefetch
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static void imxrt_flexspi_configure_prefetch(struct flexspi_dev_s *dev,
+                                             bool enable)
+{
+  struct imxrt_flexspidev_s *priv = (struct imxrt_flexspidev_s *)dev;
+
+  imxrt_flexspi_configure_prefetch_private(priv->base, enable);
+}
+
 /****************************************************************************
 * Name: imxrt_flexspi_update_lut
 *
--- a/arch/arm/src/imxrt/imxrt_flexspi.h
+++ b/arch/arm/src/imxrt/imxrt_flexspi.h
@ -127,6 +127,23 @@

 #define FLEXSPI_TRANSFER(d,x) (d)->ops->transfer_blocking(d,x)

+/****************************************************************************
+ * Name: FLEXSPI_CONFIGURE_PREFTECH
+ *
+ * Description:
+ *   Enable / disable prefetch
+ *
+ * Input Parameters:
+ *   dev     - Device-specific state data
+ *   enable  - Enable prefetch
+ *
+ * Returned Value:
+ *   none
+ *
+ ****************************************************************************/
+
+#define FLEXSPI_CONFIGURE_PREFETCH(d,e) (d)->ops->configure_prefetch(d,e)
+
 /****************************************************************************
 * Name: FLEXSPI_SOFTWARE_RESET
 *
@ -508,6 +525,7 @@ struct flexspi_ops_s
  int (*transfer_blocking)(struct flexspi_dev_s *dev,
                           struct flexspi_transfer_s *xfer);
  void (*software_reset)(struct flexspi_dev_s *dev);
+  void (*configure_prefetch)(struct flexspi_dev_s *dev, bool enable);
  void (*update_lut)(struct flexspi_dev_s *dev,
                     uint32_t index, const uint32_t *cmd,
                     uint32_t count);
--- a/Show more
+++ b/Show more