Embedded Linux Development Using Yocto Project Cookbook - Second Edition

Finding the Linux kernel source

To find the Linux kernel source, we might use several methods. As we know we are building for a Wandboard machine, the first thing to do is find a machine configuration file:

$ cd /opt/yocto/fsl-community-bsp/sources
$ find -name wandboard.conf
./meta-freescale-3rdparty/conf/machine/wandboard.conf  

As we have seen before, this machine configuration file specifies the Linux kernel recipe to use:

WANDBOARD_DEFAULT_KERNEL = "linux-wandboard"                                        
WANDBOARD_DEFAULT_KERNEL_use-mainline-bsp = "linux-fslc"                            
PREFERRED_PROVIDER_virtual/kernel ?= "${WANDBOARD_DEFAULT_KERNEL}" 

Unless we have modified our conf/local.conf with a use-mainline-bsp override, which we haven't, the machine will use the linux-wandboard recipe.

We ...