Hi,

On Sun, Dec 29, 2024 at 11:26:38AM -0500, Eben King wrote:
> The boot device is currently /dev/sdb which has a GPT partition table, and
> its first few partitions are
> 
> number  size   mount point
> 1       953MB  /boot
> 2       2GB    /
> 3       10GB   /usr
> 11      9GB    /home
> 13      48GB   swap
> 5       953MB  unmounted, filesystem="grub2 core.img", flags="bios_grub"

Does UEFI booting not require an EFI System Partition (ESP) of type vfat
typically mounted at /boot/efi on Debian?

> I swear I ran a program that showed me EFI boot vars (if they exist)
> and it showed nothing.  But now I can't remember what that program
> was.

Probably "efivar --list". It's in the "efivar" package and not installed
by default.

> How can I ensure that I'm actually booted using EFI?

If you're booted by UEFI then /sys/firmware/efi/ will exist.

Thanks,
Andy

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