On 07/09/2024 at 10:30, Thomas Schmitt via Grub-devel wrote:
Pascal Hambourg wrote:
When
booting from a EFI partition on a regular disk, then $root is set to the
EFI partition (hdX,Y). When booting from a EFI El Torito image on a CD,
then $root is set to the whole CD (cdX), and the El Torito image is not
visible.
(...)
There remains my curiosity why this difference between booting via
El Torito and via partition table from the same FAT filesystem exists
and whether this is a bug.
From what I can see in EFI shell, UEFI maps El Torito images as block
devices, like partitions, but I suppose that GRUB uses only block
devices which map to entire drives and maps partitions with its own
partition table drivers (and has no El Torito driver).
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