My blog contains a series of posts describing how to build a hobby AArch64 Operating System for Raspberry Pi and compatible SBCs. These tutorials are generally useful for AArch64 development on non-RPi based systems, but a few modifications will be required for the code.

All the code for the project can be found in my Github repository.

If you are interested in building the OS, the posts should be followed in this order:

RPI Bare Metal Cross Compiling Toolchain

Using Packer To Build Development VMs

Bare Metal Build System

Basics of GCC Linker Scripts

AArch64 Bare Metal Boot Code