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local-nuttx-update/Documentation/guides/port_arm_cm4.rst
Takuya Miyasita f66c4a0733 Documentation/guides: add the guide:how to port. 
I think the guy who wants to port NuttX is expected to understand NuttX kernel code and related configurations,
but the getting enough knowledge needs to read the kernel codes deeply.

To reduce the time for NuttX beginner who wants to port,
I tried to make the guide (how to port) based on my porting journey.
2024-12-12 21:52:24 +08:00

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The case of ARM CM4 & cxd32xx @NuttX12.4.0
==========================================
Step1 : Add the SoC
-------------------
Create the SoC directory.
.. code-block::
$ touch arch/arm/include/cxd32xx
$ touch arch/arm/src/cxd32xx
Modify "arch/arm/Kconfig" to register the SoC directory.
Add "Kconfig" and "Make.defs" for the SoC directory.
.. code-block::
$ touch arch/arm/src/cxd32xx/Kconfig
$ touch arch/arm/src/cxd32xx/Make.defs
For details about these files, see `apache/nuttx/pull/12441`_
Step2 : Add the Board
---------------------
There are two ways about adding the Board directory.
The one is in-of-tree, another one is out-of-tree.
For details see :doc:`/guides/customboards`.
And if you wanted to add own apps, see :doc:`/guides/customapps`.
This time, the way of out-of-tree is selected.
The directory structure is following :
.. code-block::
apps/
nuttx/
out-of-tree/cxd32xx_boards
Create the board : cb2sdb2 as the board of cxd32xx.
.. code-block::
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/configs/nsh
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/include
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/scripts
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/src
Add "Kconfig", "defconfig", "Make.defs" and "Makefile".
.. code-block::
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/Kconfig
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/configs/nsh/defconfig
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/scripts/Make.defs
$ touch out-of-tree/cxd32xx_boards/cb2sdb2/src/Makefile
For details about these files, see :ref:`out-of-tree`.
Step3 : Configure
-----------------
Now you can do configure by following commands.
It is important to confirm these commands are working.
.. code-block::
$ cd nuttx
$ ./tools/configure.sh -l ../out-of-tree/cxd32xx_boards/cb2sdb2/configs/nsh
And you can do menuconfig by following command.
.. code-block::
$ make menuconfig
And you can do distclean by following command.
.. code-block::
$ make distclean
Step4 : Compile
---------------
Try to buid with the implementation of Step1-2, you would face the error as following
if you implemented only directory / Kconfig / Make.defs / Makefile / defconfig about Step1-2.
.. code-block::
$ make
Create version.h
LN: platform/board to /home/lassdk/workdir/nuttx1/apps/platform/dummy
In file included from /home/lassdk/workdir/nuttx1/nuttx/include/nuttx/irq.h:37:0,
from /home/lassdk/workdir/nuttx1/nuttx/include/nuttx/sched.h:40,
from /home/lassdk/workdir/nuttx1/nuttx/include/nuttx/arch.h:87,
from ./clock/clock_initialize.c:37:
/home/lassdk/workdir/nuttx1/nuttx/include/arch/irq.h:43:27:
fatal error: arch/chip/irq.h: No such file or directory
compilation terminated.
ERROR: arm-none-eabi-gcc failed: 1
command: arm-none-eabi-gcc -MT ./clock_initialize.o -M '-Wstrict-prototypes'
'-Wno-attributes' '-Wno-unknown-pragmas' '-Wno-psabi' '-Os'
'-fno-strict-aliasing' '-fomit-frame-pointer' '-fno-common' '-Wall'
'-Wshadow' '-Wundef'
'-ffunction-sections' '-fdata-sections' '-mlittle-endian'
'-march=armv7e-m' '-mtune=cortex-m4'
'-mfpu=fpv4-sp-d16' '-mfloat-abi=hard' '-mthumb' '-Wa,-mthumb'
'-Wa,-mimplicit-it=always' '-isystem'
'/home/lassdk/workdir/nuttx1/nuttx/include'
'-D__NuttX__' '-DNDEBUG' '-D__KERNEL__' '-pipe' '-I'
'/home/lassdk/workdir/nuttx1/nuttx/sched' ./clock/clock_initialize.c
make[2]: *** [/home/lassdk/workdir/nuttx1/nuttx/tools/Config.mk:230:
clock_initialize.ddc] Error 1
make[1]: *** [Makefile:71: .depend] Error 2
make: *** [tools/Unix.mk:619: pass2dep] Error 2
Try to add "irq.h" with referring to cxd56xx and retry to build.
This time, the build system will teach that you have to implement "chip.h" as following.
.. code-block::
$ make
CC: clock/clock_initialize.c In file included from
/home/lassdk/workdir/nuttx2/nuttx/include/arch/armv7-m/irq.h:37:0,
from /home/lassdk/workdir/nuttx2/nuttx/include/arch/irq.h:56,
from /home/lassdk/workdir/nuttx2/nuttx/include/nuttx/irq.h:37,
from /home/lassdk/workdir/nuttx2/nuttx/include/nuttx/sched.h:40,
from /home/lassdk/workdir/nuttx2/nuttx/include/nuttx/arch.h:87,
from clock/clock_initialize.c:37:
/home/lassdk/workdir/nuttx2/nuttx/include/arch/armv7-m/nvicpri.h:28:28
fatal error: arch/chip/chip.h: No such file or directory
compilation terminated.
make[1]: *** [Makefile:61: clock_initialize.o] Error 1
make: *** [tools/LibTargets.mk:65: sched/libsched.a] Error 2
Continue this try and error until pass the Compiling.
Step5 : Link
------------
After the pass of Compiling, you will get following error.
To resolve this error, you have to implement the linker script.
.. code-block::
$ make
make[1]: *** No rule to make target
'/home/lassdk/workdir/nuttx1/nuttx/../cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld',
needed by '/home/lassdk/workdir/nuttx1/nuttx/../cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld.tmp'.
Stop.
make: *** [tools/Unix.mk:545: nuttx] Error 2
Try to add the linker script with referring to some board(cxd56xx, lpc43xx, etc) or :ref:`out-of-tree`
and retry to build, the build system will teach that you have to implement some symbols as following.
.. code-block::
$ make
CPP: /home/lassdk/workdir/nuttx1/nuttx/../cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld->
/home/lassdk/workdir/nuttx1/nuttx/../boarLD: nuttx
arm-none-eabi-ld: warning: cannot find entry symbol __start; defaulting to 24011000
/home/lassdk/workdir/nuttx1/nuttx/staging/libarch.a(arm_vectors.o):(.vectors+0x4):
undefined reference to `__start'
/home/lassdk/workdir/nuttx1/nuttx/staging/libarch.a(arm_doirq.o): In function `arm_doirq':
arm_doirq.c:(.text.arm_doirq+0x12): undefined reference to `arm_ack_irq'
/home/lassdk/workdir/nuttx1/nuttx/staging/libdrivers.a(syslog_channel.o):
In function `syslog_default_putc':
syslog_channel.c:(.text.syslog_default_putc+0x2): undefined reference to `up_putc'
/home/lassdk/workdir/nuttx1/nuttx/staging/libarch.a(arm_nputs.o): In function `up_nputs':
arm_nputs.c:(.text.up_nputs+0x10): undefined reference to `up_putc'
make[1]: *** [Makefile:197: nuttx] Error 1
make: *** [tools/Unix.mk:545: nuttx] Error 2
Step6 : Implement
-----------------
There are some implementation items, major items are bellow listed. To pass the Linking,
try to implement these symboles.
+-----------------+------------------------+--------------------------------------------------------------------+
| Category | Item | Comment |
+-----------------+------------------------+--------------------------------------------------------------------+
| SoC directory | entory point : __start | `apache/nuttx/pull/12441`_ |
+ +------------------------+ +
| | Serial Driver | |
+ +------------------------+ +
| | IDLE task stack | |
+ +------------------------+ +
| | INTC | |
+ +------------------------+ +
| | Timer | |
+-----------------+------------------------+------------------------------------------------+-------------------+
| Board directory | board_app_initialize | :doc:`/applications/nsh/customizing` |:ref:`out-of-tree` |
+ +------------------------+------------------------------------------------+ |
| |<arch>_board_initialize | `sched/Kconfig`_ :BOARD_<EARLY/LATE>_INITIALIZE| |
+-----------------+------------------------+------------------------------------------------+-------------------+
.. _apache/nuttx/pull/12441: https://github.com/apache/nuttx/pull/12441
.. _sched/Kconfig: https://github.com/apache/nuttx/blob/master/sched/Kconfig
If got the pass of Linking, you would see follwoing result.
.. code-block::
$ make
Create version.h
LN: platform/board to /home/lassdk/workdir/nuttx2/apps/platform/dummy
Register: nsh
Register: sh
CPP: /home/lassdk/workdir/nuttx2/nuttx/../boards/cb2sdb2/scripts/cb2sdb2.ld->
/home/lassdk/workdir/nuttx2/nuttx/../boarLD: nuttx
Step7 : Verify
--------------
To execute and debug on the evalutaion board, add following configurations.
.. code-block::
CONFIG_RAW_BINARY=y
CONFIG_DEBUG_SYMBOLS=y
If your implementations were good, you would see following logs.
.. code-block::
NuttShell (NSH) NuttX-12.4.0
nsh>
nsh>
nsh>
After comfirming to boot NuttShell(NSH), try to execute "apps/testing/ostest".
The "apps/testing/ostest" needs following configurations.
.. code-block::
CONFIG_BUILTIN=y
CONFIG_NSH_BUILTIN_APPS=y
CONFIG_SCHED_WAITPID=y
CONFIG_TESTING_OSTEST=y
And one more test is recomended to check the timer implementation whether
the kernel could count the time accurately or not.
I checked it by following code. About the function : cxd32_timerget(),
see `apache/nuttx/pull/12441`_
.. code-block::
extern uint32_t cxd32_timerget(void);
{
uint32_t pre;
uint32_t post;
pre = cxd32_timerget();
sleep(1);
post = cxd32_timerget();
printf("pre:%lu post:%lu exptect:1sec\n", pre, post);
pre = cxd32_timerget();
sleep(10);
post = cxd32_timerget();
printf("pre:%lu post:%lu exptect:10sec\n", pre, post);
}
.. _out-of-tree:
Appendix : out-of-tree code
---------------------------
.. code-block::
diff --git a/cxd32xx_apps/Make.defs b/cxd32xx_apps/Make.defs
new file mode 100644
index 0000000..2d6b86e
--- /dev/null
+++ b/cxd32xx_apps/Make.defs
@@ -0,0 +1 @@
+include $(wildcard $(APPDIR)/cxd32xx_apps/*/Make.defs)
diff --git a/cxd32xx_apps/Makefile b/cxd32xx_apps/Makefile
new file mode 100644
index 0000000..e451b29
--- /dev/null
+++ b/cxd32xx_apps/Makefile
@@ -0,0 +1,3 @@
+MENUDESC = "cxd32xx_apps"
+
+include $(APPDIR)/Directory.mk
diff --git a/cxd32xx_apps/hello/Kconfig b/cxd32xx_apps/hello/Kconfig
new file mode 100644
index 0000000..7f0b41e
--- /dev/null
+++ b/cxd32xx_apps/hello/Kconfig
@@ -0,0 +1,29 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config CXD32XX_APPS_HELLO
+ tristate "CXD32XX Hello App"
+ default n
+ ---help---
+ Enable the CXD32XX Hello App
+
+if CXD32XX_APPS_HELLO
+
+config CXD32XX_APPS_HELLO_PROGNAME
+ string "Program name"
+ default "hello"
+ ---help---
+ This is the name of the program that will be used when the NSH ELF
+ program is installed.
+
+config CXD32XX_APPS_HELLO_PRIORITY
+ int "CXD32XX Hello task priority"
+ default 100
+
+config CXD32XX_APPS_HELLO_STACKSIZE
+ int "CXD32XX Hello stack size"
+ default DEFAULT_TASK_STACKSIZE
+
+endif
diff --git a/cxd32xx_apps/hello/Make.defs b/cxd32xx_apps/hello/Make.defs
new file mode 100644
index 0000000..730329a
--- /dev/null
+++ b/cxd32xx_apps/hello/Make.defs
@@ -0,0 +1,3 @@
+ifneq ($(CONFIG_CXD32XX_APPS_HELLO),)
+CONFIGURED_APPS += $(APPDIR)/cxd32xx_apps/hello
+endif
diff --git a/cxd32xx_apps/hello/Makefile b/cxd32xx_apps/hello/Makefile
new file mode 100644
index 0000000..b3438e1
--- /dev/null
+++ b/cxd32xx_apps/hello/Makefile
@@ -0,0 +1,14 @@
+include $(APPDIR)/Make.defs
+
+# Custom Hello built-in application info
+
+PROGNAME = $(CONFIG_CXD32XX_APPS_HELLO_PROGNAME)
+PRIORITY = $(CONFIG_CXD32XX_APPS_HELLO_PRIORITY)
+STACKSIZE = $(CONFIG_CXD32XX_APPS_HELLO_STACKSIZE)
+MODULE = $(CONFIG_CXD32XX_APPS_HELLO)
+
+# Custom Hello
+
+MAINSRC = hello.c
+
+include $(APPDIR)/Application.mk
diff --git a/cxd32xx_apps/hello/hello.c b/cxd32xx_apps/hello/hello.c
new file mode 100644
index 0000000..b14a762
--- /dev/null
+++ b/cxd32xx_apps/hello/hello.c
@@ -0,0 +1,24 @@
+/****************************************************************************
+ * cxd32xx_apps/hello/hello.c
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * hello_main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+ printf("Hello, World!!\n");
+ return 0;
+}
diff --git a/cxd32xx_apps/time/Kconfig b/cxd32xx_apps/time/Kconfig
new file mode 100644
index 0000000..64e7591
--- /dev/null
+++ b/cxd32xx_apps/time/Kconfig
@@ -0,0 +1,28 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config CXD32XX_APPS_TIME
+ tristate "CXD32XX Time App"
+ default n
+ ---help---
+ Enable the CXD32XX Time App
+
+if CXD32XX_APPS_HELLO
+
+config CXD32XX_APPS_TIME_PROGNAME
+ string "Program name"
+ default "time"
+ ---help---
+ This apps measures the elasped time of sleep system call to confirm the timer implementation.
+
+config CXD32XX_APPS_TIME_PRIORITY
+ int "CXD32XX Time task priority"
+ default 100
+
+config CXD32XX_APPS_TIME_STACKSIZE
+ int "CXD32XX Time stack size"
+ default DEFAULT_TASK_STACKSIZE
+
+endif
diff --git a/cxd32xx_apps/time/Make.defs b/cxd32xx_apps/time/Make.defs
new file mode 100644
index 0000000..cdfb4cc
--- /dev/null
+++ b/cxd32xx_apps/time/Make.defs
@@ -0,0 +1,3 @@
+ifneq ($(CONFIG_CXD32XX_APPS_TIME),)
+CONFIGURED_APPS += $(APPDIR)/cxd32xx_apps/time
+endif
diff --git a/cxd32xx_apps/time/Makefile b/cxd32xx_apps/time/Makefile
new file mode 100644
index 0000000..94c9007
--- /dev/null
+++ b/cxd32xx_apps/time/Makefile
@@ -0,0 +1,14 @@
+include $(APPDIR)/Make.defs
+
+# Custom Hello built-in application info
+
+PROGNAME = $(CONFIG_CXD32XX_APPS_TIME_PROGNAME)
+PRIORITY = $(CONFIG_CXD32XX_APPS_TIME_PRIORITY)
+STACKSIZE = $(CONFIG_CXD32XX_APPS_TIME_STACKSIZE)
+MODULE = $(CONFIG_CXD32XX_APPS_TIME)
+
+# Custom Hello
+
+MAINSRC = time.c
+
+include $(APPDIR)/Application.mk
diff --git a/cxd32xx_apps/time/time.c b/cxd32xx_apps/time/time.c
new file mode 100644
index 0000000..9775ef2
--- /dev/null
+++ b/cxd32xx_apps/time/time.c
@@ -0,0 +1,41 @@
+/****************************************************************************
+ * cxd32xx_apps/time/time.c
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdio.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+extern uint32_t cxd32_timerget(void);
+
+/****************************************************************************
+ * hello_main
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+ uint32_t pre;
+ uint32_t post;
+
+ printf("measures the elasped time of sleep system call to confirm \
+ the timer implementation.\n");
+
+ pre = cxd32_timerget();
+ sleep(1);
+ post = cxd32_timerget();
+ printf("pre:%lu post:%lu exptect:1sec\n", pre, post);
+
+ pre = cxd32_timerget();
+ sleep(10);
+ post = cxd32_timerget();
+ printf("pre:%lu post:%lu exptect:10sec\n", pre, post);
+
+ return 0;
+}
diff --git a/cxd32xx_boards/cb2sdb2/Kconfig b/cxd32xx_boards/cb2sdb2/Kconfig
new file mode 100644
index 0000000..f72f3c0
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/Kconfig
@@ -0,0 +1,4 @@
+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
diff --git a/cxd32xx_boards/cb2sdb2/configs/nsh/defconfig b/cxd32xx_boards/cb2sdb2/configs/nsh/defconfig
new file mode 100644
index 0000000..1d4c3e2
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/configs/nsh/defconfig
@@ -0,0 +1,38 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+CONFIG_ARCH="arm"
+CONFIG_ARCH_CORTEXM4=y
+CONFIG_ARCH_FPU=y
+CONFIG_ARCH_CHIP="cxd32xx"
+CONFIG_ARCH_CHIP_CXD32XX=y
+CONFIG_ARCH_BOARD_CUSTOM=y
+CONFIG_ARCH_BOARD_CUSTOM_DIR="../out-of-tree/cxd32xx_boards/cb2sdb2"
+CONFIG_ARCH_BOARD_CUSTOM_DIR_RELPATH=y
+CONFIG_ARCH_BOARD_CUSTOM_NAME="cb2sdb2"
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_UART0_SERIAL_CONSOLE=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_RAM_START=0x00800000
+CONFIG_RAM_SIZE=244736
+CONFIG_ARCH_RAMVECTORS=y
+CONFIG_RAW_BINARY=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_UART_PL011=y
+CONFIG_UART0_PL011=y
+CONFIG_UART0_BASE=0x42104000
+CONFIG_UART0_IRQ=89
+CONFIG_UART0_CLK_FREQ=32000000
+CONFIG_UART_PL011_PLATFORMIF=y
+CONFIG_BUILTIN=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_TESTING_OSTEST=y
+CONFIG_FS_PROCFS=y
+CONFIG_STACK_COLORATION=y
+CONFIG_CXD32XX_APPS_HELLO=y
+CONFIG_CXD32XX_APPS_TIME=y
diff --git a/cxd32xx_boards/cb2sdb2/include/board.h b/cxd32xx_boards/cb2sdb2/include/board.h
new file mode 100644
index 0000000..eae687e
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/include/board.h
@@ -0,0 +1,54 @@
+/****************************************************************************
+ * cxd32xx_boards/cb2sdb2/include/board.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __CXD32XX_BOARDS_CB2SDB2_INCLUDE_BOARD_H
+#define __CXD32XX_BOARDS_CB2SDB2_INCLUDE_BOARD_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/irq.h>
+#include <sys/boardctl.h>
+#include <stdbool.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cxd32_boardinitialize
+ *
+ * Description:
+ *
+ ****************************************************************************/
+
+void cxd32_boardinitialize(void);
+
+#endif /* __CXD32XX_BOARDS_CB2SDB2_INCLUDE_BOARD_H */
diff --git a/cxd32xx_boards/cb2sdb2/scripts/Make.defs b/cxd32xx_boards/cb2sdb2/scripts/Make.defs
new file mode 100644
index 0000000..4986d69
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/scripts/Make.defs
@@ -0,0 +1,40 @@
+############################################################################
+# cxd32xx_boards/cb2sdb2/scripts/Make.defs
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(TOPDIR)/.config
+include $(TOPDIR)/tools/Config.mk
+include $(TOPDIR)/arch/arm/src/armv7-m/Toolchain.defs
+
+LDSCRIPT = cb2sdb2.ld
+
+ARCHSCRIPT += $(BOARD_DIR)$(DELIM)scripts$(DELIM)$(LDSCRIPT)
+
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS := $(ARCHCFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS := $(ARCHCXXFLAGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS := $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS)
+AFLAGS := $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
diff --git a/cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld b/cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld
new file mode 100644
index 0000000..34ac8ac
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld
@@ -0,0 +1,99 @@
+/****************************************************************************
+ * cxd32xx_boards/cb2sdb2/scripts/cb2sdb2.ld
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+INCLUDE ../../../../out-of-tree/cxd32xx_boards/cb2sdb2/scripts/memmap.ld
+
+OUTPUT_ARCH(arm)
+ENTRY(__start) /* Treat __start as the anchor for dead code stripping */
+EXTERN(_vectors) /* Force the vectors to be included in the output */
+SECTIONS
+{
+ .text : {
+ _stext = ABSOLUTE(.);
+ *(.entry)
+ *(.vectors)
+ *(.text .text.*)
+ *(.fixup)
+ *(.gnu.warning)
+ *(.rodata .rodata.*)
+ *(.gnu.linkonce.t.*)
+ *(.glue_7)
+ *(.glue_7t)
+ *(.got)
+ *(.gcc_except_table)
+ *(.gnu.linkonce.r.*)
+ _etext = ABSOLUTE(.);
+ } > flash_Cached
+
+ .init_section : {
+ _sinit = ABSOLUTE(.);
+ KEEP(*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
+ KEEP(*(.init_array .ctors))
+ _einit = ABSOLUTE(.);
+ } > flash_Cached
+
+ .ARM.extab : {
+ *(.ARM.extab*)
+ } > flash_Cached
+
+ __exidx_start = ABSOLUTE(.);
+ .ARM.exidx : {
+ *(.ARM.exidx*)
+ } > flash_Cached
+ __exidx_end = ABSOLUTE(.);
+
+ _eronly = ABSOLUTE(.);
+
+ .data : {
+ _sdata = ABSOLUTE(.);
+ *(.data .data.*)
+ *(.gnu.linkonce.d.*)
+ CONSTRUCTORS
+ . = ALIGN(4);
+ _edata = ABSOLUTE(.);
+ } > sram AT > flash_Cached
+
+ .ram_vectors : {
+ *(.ram_vectors)
+ } > sram
+
+ .bss : { /* BSS */
+ _sbss = ABSOLUTE(.);
+ *(.bss .bss.*)
+ *(.gnu.linkonce.b.*)
+ *(COMMON)
+ . = ALIGN(4);
+ _ebss = ABSOLUTE(.);
+ } > sram
+
+ /* 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) }
+}
diff --git a/cxd32xx_boards/cb2sdb2/scripts/memmap.ld b/cxd32xx_boards/cb2sdb2/scripts/memmap.ld
new file mode 100644
index 0000000..848f336
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/scripts/memmap.ld
@@ -0,0 +1,13 @@
+/****************************************************************************
+ * Automatically generated file; DO NOT EDIT.
+ ****************************************************************************/
+
+MEMORY
+{
+ sram (rwx) : ORIGIN = 0x00800000, LENGTH = 0x0003BC00
+ sram_erw (rw) : ORIGIN = 0x0083BC00, LENGTH = 0x00001000
+ sram_frw (rw) : ORIGIN = 0x0083CC00, LENGTH = 0x00002000
+ sram_prt (rw) : ORIGIN = 0x0083EC00, LENGTH = 0x00001000
+ sram_lib (rwx) : ORIGIN = 0x0083FC00, LENGTH = 0x00000400
+ flash_Cached (rx) : ORIGIN = 0x24010000, LENGTH = 0x0013F000
+}
diff --git a/cxd32xx_boards/cb2sdb2/src/Makefile b/cxd32xx_boards/cb2sdb2/src/Makefile
new file mode 100644
index 0000000..f8b1cd8
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/src/Makefile
@@ -0,0 +1,25 @@
+############################################################################
+# cxd32xx_boards/cb2sdb2/src/Makefile
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership. The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(TOPDIR)/Make.defs
+
+CSRCS += cxd32_appinit.c cxd32_boot.c
+
+include $(TOPDIR)/boards/Board.mk
diff --git a/cxd32xx_boards/cb2sdb2/src/cxd32_appinit.c b/cxd32xx_boards/cb2sdb2/src/cxd32_appinit.c
new file mode 100644
index 0000000..c1bef5f
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/src/cxd32_appinit.c
@@ -0,0 +1,90 @@
+/****************************************************************************
+ * cxd32xx_boards/cb2sdb2/src/cxd32_appinit.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <sys/types.h>
+#include <nuttx/board.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_app_initialize
+ *
+ * Description:
+ * Perform application specific initialization. This function is never
+ * called directly from application code, but only indirectly via the
+ * (non-standard) boardctl() interface using the command BOARDIOC_INIT.
+ *
+ * Input Parameters:
+ * arg - The boardctl() argument is passed to the board_app_initialize()
+ * implementation without modification. The argument has no
+ * meaning to NuttX; the meaning of the argument is a contract
+ * between the board-specific initialization logic and the
+ * matching application logic. The value could be such things as a
+ * mode enumeration value, a set of DIP switch switch settings, a
+ * pointer to configuration data read from a file or serial FLASH,
+ * or whatever you would like to do with it. Every implementation
+ * should accept zero/NULL as a default configuration.
+ *
+ * Returned Value:
+ * Zero (OK) is returned on success; a negated errno value is returned on
+ * any failure to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int board_app_initialize(uintptr_t arg)
+{
+ /* XXX : it will be implemented later */
+
+ return OK;
+}
+
+/****************************************************************************
+ * Name: board_late_initialize
+ *
+ * Description:
+ * If CONFIG_BOARD_LATE_INITIALIZE is selected, then an additional
+ * initialization call will be performed in the boot-up sequence to a
+ * function called board_late_initialize(). board_late_initialize()
+ * will be called immediately after up_initialize() is called and just
+ * before the initial application is started. This additional
+ * initialization phase may be used, for example, to initialize board-
+ * specific device drivers.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_BOARD_LATE_INITIALIZE
+void weak_function board_late_initialize(void)
+{
+ /* XXX : it will be implemented later */
+}
+#endif
diff --git a/cxd32xx_boards/cb2sdb2/src/cxd32_boot.c b/cxd32xx_boards/cb2sdb2/src/cxd32_boot.c
new file mode 100644
index 0000000..edf4328
--- /dev/null
+++ b/cxd32xx_boards/cb2sdb2/src/cxd32_boot.c
@@ -0,0 +1,56 @@
+/****************************************************************************
+ * cxd32xx_boards/cb2sdb2/src/cxd32_boot.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include <nuttx/board.h>
+#include <arch/board/board.h>
+
+#include "arm_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cxd32_boardinitialize
+ *
+ * Description:
+ *
+ ****************************************************************************/
+
+void cxd32_boardinitialize(void)
+{
+ /* XXX : it will be implemented later */
+}
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