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Getting really frustrated with the Mac boot process. Has someone actually documented this properly, or do I really need to play a random guesswork game until I stumble upon something that works?
There's the HFS+ magic bless stuff. But that requires HFS+. There's Boot Camp aka CSM. How does it decide when an MBR volume is bootable? There's the EFI System Partition. Does this actually work? What EFI filename does it want? Is there other magic?
Every article I find about this is some incomplete explanation, usually involving bless, but never actually going down a step by step list of what the Apple boot manager supports and doesn't support, and what the specific requirements are, and what other magic knobs exist.
There are at least *some* reports that Macs know how to boot from BOOTx64.EFI, so that's going to be my next blind shooting attempt, which will involve converting this Linux install from MBR/BIOS to GPT/EFI in place. Wish me luck. Hope it's not for nothing.
@winocm already answered my exact question already (and her answer is correct and works), so you can stop recommending random alternate bootloaders now, thanks :-)https://twitter.com/winocm/status/1282199345576566784 …
Now figuring out why boot gets stuck on penguins and no text, but that's not an EFI issue any more. Probably missing GPU firmware.
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