Comment 7 for bug 1860640

It's a cute little feature, but I think the decision was made long ago that the resources needed to maintain it outweigh the benefit of supporting a handful of old Macs and Bay Trail devices.

I want to note that we *do* ship unsigned 32-bit grub, so in theory, if you want to hack this together it should be as easy as installing grub-efi-ia32 after booting and installing in BIOS mode.