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How to check if GRUB is in EFI or BIOS mode?

rated 0 times [ 7] [ 0] / answers: 1 / hits: 9107 / 2 Years ago, fri, september 30, 2022, 5:18:07

Is there a command at the grub shell that would indicate if the machine is presenting EFI or BIOS firmware?

I'm using GRUB 2.00 on a 2010 Mac Pro. This computer has EFI firmware of course. But I have been trying for a couple of days to get it to boot Ubuntu in BIOS-emulation mode for want of NVIDIA display drivers. My understanding is that by the time GRUB is running, the decision to use EFI or BIOS emulation has already been made. So how can I check from GRUB?

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3 Years ago

answered 2 Years ago bsorbedeldy · Accepted Answer

As of GRUB 2.00, assuming GRUB is working well enough to get into normal mode rather than rescue mode, echo $grub_platform from the GRUB shell will show pc in BIOS mode and efi in UEFI mode.

The BIOS build corresponds to the grub-pc package, and the UEFI build corresponds to the grub-efi-amd64 (or, less commonly, grub-efi-ia32) package.