Updated to add info about the NOR flash
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A lot of people are unclear on how Apple Silicon machines boot and what it means for people coming from a UEFI perspective, so I wrote up a comparison https://github.com/AsahiLinux/docs/wiki/M1-vs.-PC-Boot … (note: current best understanding, there may be inaccuracies). TLDR iBoot + Recovery ~= UEFI firmware.
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this has the same feel to it as loading your Linux bootloader from inside System 7
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which partition is Recovery OS on, and which one is the OS the boot options screen runs in? (i'd assume that's the same one as recovery?)
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Third partition, it's the same thing. Holding down the button boots Darwin and the picker app, picking options/recovery just quits that and pulls up the recovery environment/app without any reboot
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Is there a chance that all changes in Asahi Linux is going to be mainlined?
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That is our goal.
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If iBoot is on partition 1, and "all 3 partitions are APFS", does that mean the initial firmware also understands APFS in order to load iBoot itself, like EFI would? (Or is that initial firmware *also* called "iBoot"? This confuses me a bit.)
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I just updated the page. There are two stages to iBoot; the first one lives in NOR flash. The Boot ROM does not understand APFS; the iBoot in NOR flash does. (I suspected, but wasn't sure about this bit, but I have just gotten confirmation)
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wait, if Recovery Mode is macOS, is there a syscall you can use under macOS to boot another OS?!
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Presumably it's rebooting with some flag :)
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