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> Turns out the Raspberry Pi (and I'm guessing many other systems) are pretty confusing to understand at boot time.

That is because how ARM ecosystem functions. There is no standard way of integrating ARM CPU into a product as Arm, the company, just sells base IP and not the complete CPU. Every ARM licensee, from Qualcomm to Apple to Nvidia are free to design their own extensions and integrations into their SoC. There is no standard for this. This creates a lot of problems for writing a generic tutorial that you see in the x86 world.