Yocto usage for Graphics SDK on AM335x, Beaglebone, AM platforms

2. Terminologies
• BitBake is a build engine that follows recipes
in a specific format in order to perform sets of
tasks. BitBake is a core component of the
Yocto Project.
• A Python framework

3. What is the goal ?
• IMAGE
– Defines
• Create boot image (Uboot, MLO, env)
• Create filesystem with some specific functionality (ex, SGX)
• MACHINE
– For a specific platform
• Targeting what distribution
– Poky ?
– Arago ?
– Angstrom ?

4. Yocto umbrella
• http://git.yoctoproject.org/cgit/cgit.cgi/
• TI package is building a “Yocto-compatible”
Arago framework

5. TI Setup
• git clone git://arago-
project.org/git/projects/oe-layersetup.git
• Usual git proxy setup
– vi ~/proxy-config
• exec /usr/bin/corkscrew <your proxy> 80 $*
– git config --global core.gitProxy ~/proxy-config

6. Basic build
• cd arago
• ./oe-layertool-setup.sh -f configs/amsdk/amsdk-
05.07.00.00-config.txt (#only if you want to be on
latest bitbake tree, otherwise skip this step)
• cd build
• . conf/setenv
• export PATH=/opt/toolchain/arago-
07262012_2011_09/arago-2011.09/armv7a/bin:$PATH
• vi conf/local.conf (to edit #of threads/parallel)
• MACHINE=am335x-evm bitbake tisdk-rootfs-image

7. Typical steps to add functionality
• Ex, Qt5
• specify sub-packages of qt5
– conf/local.conf
• IMAGE_INSTALL_append = " qtbase qtbase-tools qtbase-
plugins qtbase-fonts“
• Specify qt5 layer (meta-qt5 downloaded from
separate git)
– conf/bblayers.conf
• /home1/prabu/arago1/arago/sources/meta-qt5
• MACHINE=am335x-evm
• bitbake tisdk-rootfs-image

8. Example – Graphics package – How to
include in MACHINE IMAGE
• Specify version of Graphics SDK that goes into
AM-SDK image
– sources/meta-arago/meta-arago-
distro/conf/distro/arago.conf
• Ex 4.09.00.01
• Specify sub-packages of Graphics SDK
– sources/meta-arago/meta-arago-distro/recipes-
core/packagegroups/packagegroup-arago-tisdk-
graphics.bb
• Ex, which demos

9. Temporary outputs (Yocto base)
• In-work packages are stored at,
– poky/build/tmp/work/beaglebone-poky-linux-
gnueabi/
– For example, libgles-omap3-4.09.00.01-
r35/packages-split

10. Example - Graphics SDK Package
Definition
• User space binary
– sources/meta-ti/recipes-graphics/libgles
• libgles-omap3_4.09.00.01.bb
• Kernel module
– sources/meta-ti/recipes-bsp/powervr-drivers
• omap3-sgx-modules_4.09.00.01.bb

11. Commands in .bb file
• do_configure()
• do_compile()
• do_install()

12. Further reference
• http://www.yoctoproject.org/docs/1.4/ref-
manual/ref-manual.html
• https://wiki.yoctoproject.org/wiki/How_do_I