Add a note in the documentation about this feature.
Signed-off-by: Simon Glass sjg@chromium.org ---
doc/develop/uefi/uefi.rst | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst index 0760ca91d4f..eade13dcfa1 100644 --- a/doc/develop/uefi/uefi.rst +++ b/doc/develop/uefi/uefi.rst @@ -963,6 +963,28 @@ 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 -------------