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Building Kernel Gumstix COM

###Download and compile DT kernel The 3.17 kernel supports DT(device tree). We can compile the *.dtb and put it in the rootfs/boot/ directory. Build the kernel zImage and put it in the rootfs/boot directory as well.

To get the kernel:

git clone [email protected]:gumstix/linux.git

Copy Kernel configuration file for your COM from Gumstix Yocto Project Meta-Gumstix repository into your Kernel directory and name it .config.

For example, Kernel 3.17 configuration for Overo is here.

While working with older u-boot versions (< 2013) you would need a uImage, while more recent u-boot versions support booting with a zImage. So depending on that, you would then build your kernel as follows:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage LOADADDR=82000000

or

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- zImage

In order to build only the dtbs,

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- dtbs

will build all the relavent device tree blobs.

Reference

Copy all the .dtb files from arch/arm/boot/dts/ and zImage to /media/username/rootfs/boot directory (not the /boot partition). Reset the board and go.

The kernel should boot all the way to the console.

Build the kernel modules:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules -j 4

To install current kernel modules to SD card root file system, use:

sudo INSTALL_MOD_PATH=/media/username/rootfs make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules_install