[Bug 221674] Installer can't back up when it finds MBR

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221674

--- Comment #4 from Nathan Whitehorn <nwhitehorn at FreeBSD.org> ---
(In reply to MMacD from comment #2)

It's one installer, the issue is that it has no idea if the machine has CSM or
not. You can't know that unless you booted CSM. You can just boot the install
disk that way by telling your BIOS that don't want to do an EFI boot if you
don't want EFI boot. We could provide a "This *might* be bootable if you press
OK" fallback, but I would prefer just modifying the warning to tell people to
disable EFI boot if they don't want EFI boot.

(In reply to Ed Maste from comment #3)

That's interesting. I don't see an obvious point in the history of the EFI
loader where that changed (no disklabel support, for example). How have you set
up your disks on ARM?

This situation is also a little dubious in that the firmware would probably
either see the FreeBSD EFI partition and boot that, giving no opportunity to
run any MBR-based boot manager (or Windows), or see the MBR-based boot manager,
which would not be able to start FreeBSD through the EFI loader.

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