Configuring the Linux kernel

In this recipe, we will explain how to configure a Linux kernel using the Yocto build system.

Getting ready

Before configuring the kernel, we need to provide a default configuration for our machine, which is the one the Yocto project uses to configure a kernel. When defining a new machine in your BSP layer, you need to provide a defconfig file.

The Wandboard's defconfig file is stored under sources/meta-fsl-arm-extra/recipes-kernel/linux/linux-wandboard-3.10.17/defconfig.

This would be the base defconfig file for our custom hardware, so we copy it to our BSP layer:

$ cd /opt/yocto/fsl-community-bsp/sources
$ mkdir -p meta-bsp-custom/recipes-kernel/linux/linux-wandboard- 3.10.17/
$ cp meta-fsl-arm-extra/recipes-kernel/linux/linux-wandboard- 3.10.17/defconfig meta-bsp-custom/recipes-kernel/linux/linux- wandboard-3.10.17/

We then add it to our kernel using meta-bsp-custom/recipes-kernel/linux/linux-wandboard_3.10.17.bbappend as follows:

# Copyright Packt Publishing 2015...