TipsAndTricks/KernelDevelopmentWithEsdk

Overview

This manual describes the Linux kernel development process with Yocto and devtool.

Setup your environment

The following command will configure the Yocto build environment

source poky/oe-init-build-env kernel-dev

Checkout the kernel source tree and construct .config

Check out the Linux kernel source and construct a .config from the Yocto kernel configuration segments. The sources can be found in /path_to_build_directory/kernel-dev/workspace/sources/linux-yocto.

devtool modify linux-yocto 

Modify your kernel and commit your changes

You can navigate to the Linux source directory (/path_to_build_directory/kernel-dev/workspace/sources/linux-yocto) and modify the kernel.

Build your kernel

Build the kernel in your workspace directory

devtool build linux-yocto 

Build an image with your kernel changes

devtool build-image core-image-minimal

Export patches and create a bbappend file

To export your commits to patches and a bbappend file use the following command.

devtool finish linux-yocto /path_to_poky_directory/meta-yocto-bsp/

The patches and the bbappend can be found in /path_to_poky_directory/meta-yocto-bsp/recipes-kernel/linux.

Build image

You can now build an image which will include your kernel patches.

Execute the following command from your build directory ( e.g /path_to_build_directory/kernel-dev/)

bitbake core-image-minimal