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Getting ready
Since our ESPRESSObin is now supported into vanilla kernel since the 4.11 release, we can get Linux sources by using the following git command:
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
This command will take a lot of time to finish so I would suggest you take a break by drinking your favorite cup of coffee (as real programmers should do).
When finished, we can enter into the linux directory to see the Linux sources:
$ cd linux/
$ ls
arch CREDITS firmware ipc lib mm scripts usr
block crypto fs Kbuild LICENSES net security virt
certs Documentation include Kconfig MAINTAINERS README sound
COPYING drivers init kernel Makefile samples tools
These sources are related to the latest kernel release that could be unstable, so to be sure that we're using a stable kernel release (or a long-term release), let's extract release 4.18, which is the current stable release at time of writing this chapter, as follows:
$ git checkout -b v4.18 v4.18