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by nicolas_17 204 days ago
The bootloader doesn't even have a USB stack capable of reading external storage.
1 comments
astrange 203 days ago
If you have kernel access you can do an OS-to-OS takeover from the original OS. That's how MkLinux worked on old Macs.
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nicolas_17 203 days ago
Or you can just sign your Linux kernel from macOS recovery mode, which is what the Asahi Linux installer does already. No need for weird hacks.

You also don't have "kernel access" in macOS. After boot, the memory region corresponding to the macOS kernel is marked as read-only at the memory controller level.

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astrange 203 days ago
> Or you can just sign your Linux kernel from macOS recovery mode, which is what the Asahi Linux installer does already. No need for weird hacks.

Does that work for USB boot?

> You also don't have "kernel access" in macOS. After boot, the memory region corresponding to the macOS kernel is marked as read-only at the memory controller level.

You can turn that off from recovery mode. (see `bputil`) It's needed to use dtrace.

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