Multiboot fails on Mac hardware

[casperes1996]

Thank you for this fantastic repo.

The multi-boot Hello World sub project, when dd'ed to a USB flash drive cannot boot properly on macOS. I get a GRUB Rescue menu that seems unable to load the actual /boot elf file. This Mac has an Ubuntu 20.10 installation that uses GRUB successfully, though Ubuntu is installed to an external disk and GRUB is on the internal so it's a tad weirdly set up but works for booting both Ubuntu and macOS, but I cannot get the multi-boot Hello World example to boot. Any ideas? Works fine in QEMU.

Also have my own boot loader written for Master Boot Record and BIOS based booting which my Mac also doesn't like, but I suspect that's because some of the assumptions I make require it to be on an IDE device. But maybe not, it shows "No bootable disk could be found" which is not a message from my boot loader, so it may never even execute a single instruction of mine.

[cirosantilli]

Sorry, I don't know this. Let me know if you find something out.

[casperes1996]

Alright; If anyone else winds up reading this who might know or figure it out, do let me know. I will see if I can figure out what might be going on Cheers -Casper S. Institute for Computer Science @ Aarhus University

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On 5 Mar 2021, at 10.11 AM, cirosantilli ***@***.***> wrote: Sorry, I don't know this. Let me know if you find something out. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#16 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHMUPVZZKBUN7UOUROQBE6TTCCN35ANCNFSM4YUNZHRQ>.