What boot.efi does to prepare to load and run the kernel: building the hardware device tree, handling startup key commands, and more.
firmware
The Mac has completed its self-test routines, and now prepares to load the EFI firmware or ‘boot loader’. Where it finds it, what it needs, and how Secure Boot changes this.
What happens in your Mac when you press the Power button? Before it loads the EFI firmware, it goes through self-testing, and initialising key chips.
Failed EFI firmware updates should be self-healing in recent models, but what do you do if your T2 Mac messes up a firmware update? Full details revealed.
All about firmware, the SMC, NVRAM, and the new T2 chips which come in some models of Mac. When and how to reset, and more.
How to check it, what the current version is, what to do about any problems. All your questions answered – even on ethernet firmware now.
When did your Mac last check its firmware? Probably only a few days ago. How eficheck keeps our Macs stable and safe.
At about 777 MB, Security Update 2018-003 for Sierra looks very substantial. So what’s inside it? Security updates […]
Looking through the more than 2 GB contents of the macOS 10.13.5 update, this is another very substantial […]
Apple was a little more forthcoming in the list of improvements and fixes in macOS High Sierra 10.13.4, […]
The Eclectic Light Company 