Earlier quoted context omitted.
Not useless , it's a useful thing to have when you're trying to learn how to write Hello World as an OS - http://wiki.osdev.org/Bare_Bones Are there any bootloader specs that are standard across architectures? UEFI comes to mind, and I'm sure you could boot an x86 board via u-boot.
Actually UEFI was very Intel-centric when it started out. It worked only on Itanium and x86. We (Red Hat) spent a great deal of time of a very talented colleague of mine porting it to Aarch64.
Aaaand the jawdrop happened when I reached the last word in that sentence. Wow, kudos.
Know of any cool videos or anything similar that demo UEFI functionality on AA64?