CM-T43: Yocto Linux: Building
Contents
Introduction
This article describes how to install and build the Yocto Linux 1.6 (Daisy) release for CM-T43 SOM on a development machine.
Preparation steps
- Obtain Linux PC host development station running Ubuntu 12.04 64 LTS.
- Download the Linux Yocto package for CM-T43 from CompuLab website. Unzip the package to a directory on your host workstation:
mkdir cm-t43-yocto-dev cd cm-t43-yocto-dev unzip /path/to/downloaded/cm-t43-yocto-linux.zip
- Install development tools:
sudo apt-get install git build-essential diffstat texinfo gawk chrpath gcc-multilib wget socat libsdl1.2-dev ia32-libs mtd-utils
- Install the Arago toolchain
wget --no-check-certificate https://launchpad.net/linaro-toolchain-binaries/trunk/2013.03/+download/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux.tar.bz2 sudo tar -jxvf gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux.tar.bz2 -C /opt
Download and install Yocto Linux development source code
Type the following commands to download and install the Yocto 1.6 (Daisy) Linux source code on the development station:
git clone git://arago-project.org/git/projects/oe-layersetup.git tisdk cd tisdk ./oe-layertool-setup.sh -f ../cm-t43-yocto-linux/development/config-yocto-1.6-cm-t43-1.txt
Apply the CM-T43 support patch
Once the Yocto 1.6 (Daisy) Linux source code is installed on the Host Ubuntu machine, apply the CM-T43 patch, as follows:
patch -p1 < ../cm-t43-yocto-linux/development/yocto-1.6-cm-t43-1.patch
At this point, CompuLab Yocto support has been installed over the Yocto Linux source code and can be built.
local.conf customizations
For local builds customization, edit you local.conf file with any favourite text editor.
Parallel build
Set the build parameters to fully utilize your host machine
BB_NUMBER_THREADS = '4'
PARALLEL_MAKE = '-j 6'
BB_NUMBER_THREADS should be your host machine's number of threads minus 2 or same.
PARALLEL_MAKE should be the number of threads your host machine has plus two.
Download directory
Recommended to save download time and space.
DL_DIR = "/home/<uname>/yocto_dl"
Setting up the Toolchain
export PATH=/opt/gcc-linaro-arm-linux-gnueabihf-4.7-2013.03-20130313_linux/bin:$PATH
Building the CM-T43 Yocto image
Change directory to the build directory of Yocto and set up the build environment:
cd build source conf/setenv
The tisdk-rootfs-image can be built as follows:
MACHINE=cm-t43 bitbake tisdk-rootfs-image
After the image is built, all images are located in: /path/to/cm-t43-yocto-dev/tisdk/build/arago-tmp-external-linaro-toolchain/deploy/images/cm-t43
