Another resource for how Apple silicon Macs boot is the "EFI Jumpstart" chapter of "Apple File System Reference", which starts off with a section about the boot

Another resource for how Apple silicon Macs boot is the "EFI Jumpstart" chapter of "Apple File System Reference", which starts off with a section about the boot process. https://developer.apple.com/go/?id=apfs-file-format-spec https://developer.apple.com/go/?id=apfs-file-format-spec