walkerla.blogg.se - Mac os x sierra virtualbox efi

internal and external storage devices, in turn requiring internal SATA/NVMe support, and external USB and Thunderbolt ports.

external USB or integral keyboard, to detect startup keys being held and react accordingly.

audio output for POST sounds (not recent MacBook Pro models).

Among the hardware which has to become accessible are the following: Before that can happen, the Mac has a lot to do in what Apple refers to as BootROM.

In most recent Mac models, the boot loader is a file named boot.efi which is stored in a set location on the startup disk.

This in turn prepares the Mac to load and run the kernel, together with its extensions, which then provide all the basic facilities for the rest of macOS. Once a Mac has cleared its initial self-test routines (POST), and key custom chips like the SMC or T2 are running, the next step is to load the EFI firmware.