Kernel build can be performed on Ubuntu 22.04 with aarch64 cross compilation. To automate this process build-kernel.sh script has been created. It will automatically install all needed dependencies on for kernel building both from RPi and Ubuntu guidelines.

On top of the RPi kernel - uConsole specific patch is applied. It contains implementation of all required drivers like video driver for uConsole screen.

To automate build process on environmend different than Ubuntu 22.04 run.sh script has been created. It utilizes docker container for building the kernel using build script.

Final results are located in out directory in the source tree.

Deploy

To deploy build result use content of out directory and copy it over to the right locations on SD card. More you can find in official RPi guide: https://www.raspberrypi.com/documentation/computers/linux_kernel.html

Kernel configuration

In order to use compiled kernel8.img with CM4 in uConsole, we have to setup a config.txt configuration file. It contains various options which will be passed to runtime kernel for proper uConsole specific drivers initialization.