Booting the Mac: the kernel and extensions https://t.co/w7UZlIkpfD — Howard Oakley, Eclectic Light Co (@howardnoakley) August 23, 2018 The whole purpose of the BootROM and EFI phases is to get to load and run the macOS kernel and its extensions, which is what boot.efi, the “OS X booter”, finally does. Although boot.efi doesn’t suddenly vanish, from … Continue reading Booting the Mac: the kernel and extensions