Customizing the linux-yocto framework

The Linux kernel is a complex software that provides an infinite number of possible configurations. The Yocto Project provides a framework (linux-yocto) to manage a huge set of machines in a single kernel tree. We can take advantage of this framework to enable or disable features for our machine, for example, by using <layer>/recipes-kernel/linux/linux-yocto_3.14.bbappend with the following content:

FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:" 
SRC_URI += "file://enable-can.cfg" 

The content of the <layer>/recipes-kernel/linux/linux-yocto/linux-yocto/enable-can.cfg file is as shown:

CONFIG_CAN=y 

One common requirement when doing a Linux-based embedded system is to change the kernel configuration. We can do this using the SDK or BitBake, as explained:

• Using SDK: The creation and installation of the Yocto Project's SDK is detailed in Chapter 8, Developing with the Yocto Project. After having the SDK exported, we can configure the Linux kernel...