Most of the functionality is present but many important bits are still being developed.
One of the real downsides of ARM is, it seems, the relative lack of standardization. An x64 kernel? It’ll run on most anything from the last ten years at least. And as for boot process, it’s probably one of two options (and in many cases one computer can boot either legacy or EFI).
ARM, on the other hand…my raspberry pi collection does one thing, my Orange Pi does something else, and God help you if you want to try swapping the Orange kernel for the Raspberry (or vice versa)!
Arm:
Somehow, the kernel has been loaded and we have transferred control into it.
If the system is SystemReady then the EFI boot chain is fairly straightforward now. My current workstation just booted off the Debian usb installer like any other pc.
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