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docs: Improve bli module documentation

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Improve the documentation of the bli module and explain in more detail what
it does. Make clear that GPT formatted drives are expected and other
partition formats are ignored. Also reorder and reword this section a bit.

Signed-off-by: Oliver Steffen <osteffen@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Oliver Steffen 2023-11-16 16:37:40 +01:00 committed by Daniel Kiper
parent 57059ccb62
commit e35683317e
1 changed files with 13 additions and 4 deletions
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docs/grub.texi
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@ -3880,11 +3880,20 @@ Modules can be loaded via the @command{insmod} (@pxref{insmod}) command.
@section bli
This module provides basic support for the Boot Loader Interface. The Boot
Loader Interface specifies a set of EFI variables that are used to communicate
boot-time information between the boot loader and the operating system.
boot-time information between the bootloader and the operating system.
When loaded, the bli module publishes the GPT partition UUID of the EFI System
Partition used during boot and a string identifying GRUB as the active boot
loader, including the version number.
The following variables are placed under the vendor UUID
@code{4a67b082-0a4c-41cf-b6c7-440b29bb8c4f} when the module is loaded:
The GPT partition UUID of the EFI System Partition used during boot is
published via the @code{LoaderDevicePartUUID} variable. The Boot Loader
Interface specification requires GPT formatted drives. The bli module
ignores drives/partitions in any other format. If GRUB is loaded from
a non-GPT partition, e.g. from an MSDOS formatted drive or network,
this variable will not be set.
A string identifying GRUB as the active bootloader including the version
number is stored in @code{LoaderInfo}.
This module is only available on UEFI platforms.