Running NuttX on Kinetis KL25Z Freedom Board (FRDM-KL25Z)

This tutorial will explain how to run NuttX on Freescale Freedom Board:

First of all Download the GCC-ARM-EMBEDDED:
https://launchpad.net/gcc-arm-embedded/+download

I’m using version gcc-arm-none-eabi-4_7-2012q4-20121208-linux.tar.bz2 but you could use newer versions.

Decompress the toolchain file:

$ tar xvf gcc-arm-none-eabi-4_7-2012q4-20121208-linux.tar.bz2

Move toolchain to /usr/local directory:

$ sudo mv gcc-arm-none-eabi-4_7-2012q4 /usr/local/gcc-arm-embedded

Add this directory to your PATH:

$ export PATH=/usr/local/gcc-arm-embedded/bin:$PATH

Case you are using Ubuntu you could install the gcc-arm-none-eabi from Terry Guo repository and just ignore these instructions above.

Download NuttX from its repository:

$ git clone git://git.code.sf.net/p/nuttx/git nuttx

Now configure NuttX to compile for Freedom board:

$ cd nuttx/nuttx/
$ cd tools/
$ ./configure.sh freedom-kl25z/nsh
$ cd -

Now edit nuttx .config and replace CONFIG_ARMV6M_TOOLCHAIN_BUILDROOT by CONFIG_ARMV6M_TOOLCHAIN_GNU_EABIL:

$ vi .config
...
#CONFIG_ARMV6M_TOOLCHAIN_BUILDROOT is not set
CONFIG_ARMV6M_TOOLCHAIN_GNU_EABIL=y

Compile nuttx using make command:

$ make

Copy nuttx.srec to Freedom board, case you have installed MBED 2.0 firmware (recommended) then you need to copy nuttx.bin instead.

Now to have access to NSH terminal running on the board, just use minicom, picocom, or your preferred serial terminal client, configured to /dev/ttyACM0 and 115200.

• Dicas
• NuttX