Building Linux OMAP Kernel
Note: In order to build the kernel, it is recommended that you use the omappedia Release Notes page corresponding to the platform you are using (Blaze, Blaze Tablet, Panda, or Zoom) and follow the instructions for that release: http://www.omappedia.com/wiki/Release_Notes In general, the instructions will be very similar with the following exceptions:
- The commit ID used to pull the code from the kernel git trees varies based on the release. It is recommended that you use the correct commit ID corresponding to your release, as this is how the validation is performed.
- The defconfig file used to setup the configuration when building the kernel varies based on the platform you are using. See the table below.
Step 1: Clone the git tree for the OMAP kernel with the below commands for Ice Cream Sandwich releases (kernel 3.0) or Gingerbread releases (kernel 2.6.35), respectively:
% git clone git://git.omapzoom.org/kernel/omap.git kernel/android-3.0 % cd kernel/android-3.0
% git clone git://git.omapzoom.org/kernel/omap.git kernel/android-2.6.35 % cd kernel/android-2.6.35
Step 2: Checkout the kernel with the commit ID corresponding to your release:
$ git checkout <<commit ID>>
$ git checkout de492e1e12b10e2d89b21ebe7228d22ea2210100
Step 3: Make sure that the u-boot tools directory is included in your path:
% export PATH=$PATH:/<path to bootloader>/u-boot/tools/mkimage
This is due to the fact that the uImage, which is generated when you build the kernel, is an image format used by the u-boot. uImage is created by a tool called mkimage, which must be in your path.
Check Bootloader_Project for more information about obtaining and building the u-boot source code.
Step 4: Determine the defconfig file that is needed for your platform. The defconfig files are located in /arch/arm/config.
|Blaze or Blaze Tablet 4430/4460 - with ICS releases||blaze_defconfig|
|Blaze or Blaze Tablet 4470 - with ICS releases||blaze_4470_defconfig|
|Blaze or Blaze Tablet 4430/4460 - with Gingerbread releases||android_4430_defconfig|
Step 5: Build the kernel with the commands:
$ make CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm <defconfig> $ make CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm uImage
For example, to build for the 4460 Blaze with an ICS release:
$ make CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm blaze_defconfig $ make CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm uImage
Step 6: If needed, build and install the kernel modules:
$ make CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm modules $ sudo make CROSS_COMPILE=arm-none-linux-gnueabi- ARCH=arm INSTALL_MOD_PATH=<path to rootfs> modules_install