Nice to see a version of this process for an UEFI kernel. ~2 years ago I was playing around with a similar LFS like, home made DIY distro myself which runs on an i586 router board and a Raspberry Pi.

Sadly this guide skips all the "fun parts" of bootstrapping your own compiler toolchain first, and instead downloads a pre-built one from a third party.

Based on my project, I also decided to write a small guide similar to this one, for the Raspberry Pi 3 as a target[1], but also included the toolchain bootstrapping process[2].

[1] https://github.com/AgentD/diy-linux-guide

[2] https://github.com/AgentD/diy-linux-guide/blob/master/crossc...