1 Introduction
This document explains how to configure a cross compiler running in iMX6Q. The target is the Kinetis L family. For the iMX6Q, Yocto is used to generate the iMX6Q image.
2 Requirements
Basic knowledge of Yocto and Linux is required. The steps explained were performed for the iMX6Q SABRE-SD and the Freedom KL25. Installation of Yocto in your host system is needed too.
3 Procedure
The chosen method to configure the cross compiler for the Kinetis L, needs a native compiler that will run in the iMX6Q. Below are the general steps:
- Generate native compiler for the iMX6Q and adding the needed packages for the configuration.
- Get and extract the source packages of the compiler.
- Configure, build and install the packages
- Test the generated cross compiler
3.1 Generating packages and native compiler for the iMX6Q
The iMX6Q image needs certain packages in order to configure and generate correctly the cross-compiler. After setting up the environment and chose the MACHINE the below lines added in the local.conf file to install those packages in our rootfs:
IMAGE_INSTALL_append = " gcc g++ binutils libgcc libgcc-dev libstdc++ libstdc++-dev libstdc++-staticdev gawk gzip perl autoconf automake libtool gettext gperf tcl guile gmp mpfr make m4 texinfo flex bison git"
The image to generate is the core-image-minimal:
bitbake core-image-minimal
Once the building is finished, a native compiler for the iMX6 and other packages needed to configure the Kinetis Compiler should be added to the Yocto image.
3.2 Getting and Extracting the Kinetis L compiler
The arm cross compiler version was gotten from CodeSourcery. arm-2011.03-42-arm-none-eabi is used in this document.
You can get the source code by:
wget https://sourcery.mentor.com/sgpp/lite/arm/portal/package8736/public/arm-none-eabi/arm-2011.03-42-arm...
Once the image was built, boot the imx6 board with this image. Copy the source code (arm-2011.03-42-arm-none-eabi.src.tar.bz) in your target that is running Linux and extract the files.
For example, a new folder was created in /home/root directory:
$ mkdir gcc_test
$ cd gcc_test
And extract the files in this folder:
$ tar –jxvf arm-2011.03-42-arm-none-eabi.src.tar.bz2
$ cd arm-2011.03-42-arm-none-eabi
Create a source and a build folder:
$ mkdir source build
Move all the files to the source folder:
$ mv *.tar.bz2 source/
Create a new folder in /opt where the kinetis cross compiler will be installed
$ cd /opt
$ mkdir arm-none-eabi
3.3 Configure, Build and Install Kinetis Compiler on the iMX6
To configure, build and install the compiler these general steps are followed for certain packages:
- Extract the package
- Configure the package
- Build and Install the package
Create an environment variable that will specify where the cross compiler will be installed:
$ export INSTALL_PREFIX=/opt/arm-none-eabi
3.3.1 GMP Package
Extract the gmp files:
$ cd ~/gcc_test/arm-2011.03-42-arm-none-eabi/source
$ tar –jxvf gmp-2011.03-42.tar.bz2
Create a new folder in build directory. This folder will contain a generated Makefile that will be used to build and install the package:
$ cd ../build
$ mkdir gmp
$cd gmp
Configure the package:
$ ../../source/gmp-2011.03/configure --prefix=$INSTALL_PREFIX --build=arm-poky-linux-gnueabi CC=arm-poky-linux-gnueabi-gcc CXX=arm-poky-linux-gnueabi-g++ --disable-newlib-supplied-syscalls --disable-libgloss --disable-nls --disable-shared
Build and Install the package
$make
$make install
3.3.2 MPFR Package
Extract the mpfr files:
$ cd ~/gcc_test/arm-2011.03-42-arm-none-eabi/source
$ tar –jxvf mpfr-2011.03-42.tar.bz2
Create a new folder in build directory. This folder will contain a generated Makefile that will be used to build and install the package:
$ cd ../build
$ mkdir mpfr
$cd mpfr
Configure the package:
$ ../../source/mpfr-2011.03/configure --prefix=$INSTALL_PREFIX --build=arm-poky-linux-gnueabi --target=arm-none-eabi CC=arm-poky-linux-gnueabi-gcc CXX=arm-poky-linux-gnueabi-g++ --with-gmp=$INSTALL_PREFIX --disable-shared
Build and Install the package
$make
$make install
3.3.3 MPC Package
Extract the mpc files:
$ cd ~/gcc_test/arm-2011.03-42-arm-none-eabi/source
$ tar –jxvf mpc-2011.03-42.tar.bz2
Create a new folder in build directory. This folder will contain a generated Makefile that will be used to build and install the package:
$ cd ../build
$ mkdir mpc
$cd mpc
Configure the package:
$ ../../source/mpc-0.8.1/configure --prefix=$INSTALL_PREFIX --target=arm-none-eabi --build=arm-poky-linux-gnueabi CC=arm-poky-linux-gnueabi-gcc CXX=arm-poky-linux-gnueabi-g++ --with-gmp=$INSTALL_PREFIX --with-mpfr=$INSTALL_PREFIX --disable-shared
Build and Install the package
$make
$make install
3.3.4 Binutils Package
Extract the binutils files:
$ cd ~/gcc_test/arm-2011.03-42-arm-none-eabi/source
$ tar –jxvf binutils--2011.03-42.tar.bz2
Create a new folder in build directory. This folder will contain configure the package:
$ cd ../build
$ mkdir binutils
$cd binutils
Configure the package:
$ ../../source/binutils-2011.03/configure --prefix=$INSTALL_PREFIX --target=arm-none-eabi --build=arm-poky-linux-gnueabi CC=arm-poky-linux-gnueabi-gcc CXX=arm-poky-linux-gnueabi-g++ --with-gmp=$INSTALL_PREFIX --with-mpfr=$INSTALL_PREFIX --with-mpc=$INSTALL_PREFIX --disable-nls --disable-werror
Build and Install the package
$make MAKEINFO=true
$make install MAKEINFO=true
3.3.5 GCC Package
Extract the gcc files:
$ cd ~/gcc_test/arm-2011.03-42-arm-none-eabi/source
$ tar –jxvf
Create a new folder in build directory. This folder will contain configure the package:
$ cd ../build
$ mkdir gcc
$cd gcc
Configure the package:
$ ../../source/gcc-4.5-2011.03/configure --prefix=$INSTALL_PREFIX --target=arm-none-eabi --build=arm-poky-linux-gnueabi --host=arm-poky-linux-gnueabi CC=arm-poky-linux-gnueabi-gcc CXX=arm-poky-linux-gnueabi-g++ --enable-languages="c" --with-gnu-ld --with-gnu-as --with-newlib --disable-nls --disable-libssp --with-newlib --without-headers --disable-shared --disable-threads --disable-libmudflap --disable-libgomp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-libffi --enable-extra-sgxxlite-multilibs --with-gmp=$INSTALL_PREFIX --with-mpfr=$INSTALL_PREFIX --with-mpc=$INSTALL_PREFIX
Build and Install the package
$make
$make install
3.4 Testing the Cross Compiler
To test the Cross compiler it is necessary to add the path of the installation to the PATH variable.
$ export PATH=/opt/arm-none-eabi/bin/:$PATH
To check the version of the cross compiler:
$ arm-none-eabi-gcc –version
arm-none-eabi-gcc (GCC) 4.5.2
Copyright (C) 2010 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
Attached you can find a folder that contains a simple KL25 example that can be compiled in the iMX6 and then flash the Freedom KL25 with the OpenSDA. This means that you have to attach the USB OpenSDA to the OTG port of the iMX6 board.
Type the next in the hello folder (/Kinetis GNU/KL25_TEST/KL25/hello)
$make clean
$make
This will generate a main.srec file that can be copied to the USB MSD device featured by the OpenSDA.
$cp main.srec /meida/sda1
$sync
After this, the RGB LED in the Freedom KL25 will toggle.
Original Attachment has been moved to: KL25.tar.zip
