Ubuntu kernel

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How to get started with Ubuntu using pre-built binaries on your OMAP Platform
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Step 3

Building for OMAP4 platform devices


[edit] Blaze Platform

[edit] Ubuntu kernel

There are several sources for Ubuntu kernel supporting OMAP4:

For Blaze board support, today, the TI git tree shall be and is used in the following instructions.

[edit] TI Ubuntu git tree structure

The TI git tree hosting Ubuntu kernel has branches for each supported kernel version into ti-ubuntu-2.6.xx branches. For example, the 2.6.34 kernel is available into the ti-ubuntu-2.6.34 branch.

Some specific kernel versions are tagged. The stable versions have a tag message indicating they are stable versions. It is advised to exclusively use tags specified as 'stable'.

[edit] Building a Ubuntu kernel

Some packages are required on your Ubuntu workstation. To install them:

sudo apt-get install git-core debhelper build-essential fakeroot kernel-wedge uboot-mkimage
git clone git://dev.omapzoom.org/pub/scm/integration/kernel-ubuntu.git
git checkout ti-ubuntu-2.6.34-901.2+ti+release0
cd <kernel source root path>
fakeroot debian/rules clean
export $(dpkg-architecture -aarmel)
CROSS_COMPILE=arm-none-linux-gnueabi- skipabi=true skipmodule=true fakeroot debian/rules binary-arch

=> Generates .deb packages in the parent folder (plus other .udeb files). It contains the kernel image and the modules. The linux-image*.deb file will be used later.

Note: for newer version of the kernel the debian rule is binary-omap4 instead of binary-arch

sudo mkimage -A arm -O linux -T kernel -C none -a 0x80008000 -e 0x80008000 -n "Ubuntu Kernel" -d <generated vmlinuz file> ./uImage

The kernel vmlinuz file can be found in a folder which name varies according to the kernel version, like: debian/kernel-image-2.6.<xx>-<yyy>-omap4-di/boot/vmlinuz.

So complete example command:

sudo mkimage -A arm -O linux -T kernel -C none -a 0x80008000 -e 0x80008000 -n "Ubuntu Kernel" -d debian/kernel-image-2.6.34-901-omap4-di/boot/vmlinuz ./uImage

=> This uImage file will have to be copied on the SD card.

=> if you are not sudoer on your machine you can use fakeroot instead of sudo.

Note: more information on Ubuntu kernel packaging / building: https://wiki.ubuntu.com/KernelTeam/KernelMaintenanceStarter.

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