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nuttx-mirror/Documentation/guides/port_arm_cm4.rst
Masanari Iida 02828921db
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Documentation/guides: Fix typos in port_arm_cm4.rst 
This patch fixes spelling typos in port_arm_cm4.rst
2024-12-20 23:09:40 -05:00

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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 build 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 symbols.
+-----------------+------------------------+--------------------------------------------------------------------+
| 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 following 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 evaluation 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 confirming 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 recommended 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 elapsed 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 elapsed 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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