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efi_loader: Add documentation for the EFI log

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Add a note in the documentation about this feature.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2024-12-01 17:12:43 -07:00
parent c824a96d76
commit 486743c3eb
1 changed files with 22 additions and 0 deletions
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22
doc/develop/uefi/uefi.rst
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@@ -1004,6 +1004,28 @@ This driver is only available if U-Boot is configured with::
CONFIG_BLK=y
CONFIG_PARTITIONS=y
Logging
-------
The EFI subsystem supports logging of boot-services calls to a memory area. The
log can then be shown using the ``efidebug log`` command. Note that only a few
calls are logged at present.
To enable this feature::
CONFIG_EFI_LOG=y
CONFIG_EFI_LOG_SIZE=0x4000
CONFIG_BLOBLIST_SIZE_RELOC=0x5000
The bloblist size must be set to larger than the EFI size. For now the log size
is fixed at the start.
Logging is performed within the internal U-Boot functions, not at the
boot-services interface. This makes it possible to log EFI calls made by U-Boot
itself, such as memory allocations.
See the :doc:`/usage/cmd/efidebug` (*log* subcommand) for more information.
Miscellaneous
-------------