erebion/coreboot
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

drivers/option: Add CBFS file based option backend

Browse source 
Add a new option backend that uses values stored in CBFS files, similar
to the SeaBIOS runtime config options stored in files with the etc/
prefix. Options should be stored in CBFS with the option/ prefix. Values
can be set using `cbfstool coreboot.rom add-int -n option/<option-name>
-i <value>`. For simplicity, options should be stored in the COREBOOT
(RO) FMAP region, which is the default for cbfstool. This backend is not
available in SMM due to CBFS dependencies on vboot functions which are
not added to SMM, and thus the fallback will be returned by calls to
get_uint_option() in SMM.

Tested with QEMU Q35 by setting various options for "sata_mode" and
observing the console output for the SATA controller mode during
i82801ix_sata initialization.

Change-Id: Ifc0439ee42f13f49ae54d4855d1d9333c39b01f5
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85905
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Jérémy Compostella <jeremy.compostella@intel.com>
This commit is contained in:
Nicholas Chin 2025-01-07 22:14:32 -07:00 • committed by Subrata Banik
commit 368f721f71
4 changed files with 39 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/include/option.h
View file

@ -7,7 +7,9 @@
void sanitize_cmos(void);
#if CONFIG(OPTION_BACKEND_NONE)
/* The CBFS file option backend cannot be used in SMM due to vboot
* dependencies, which are not added to SMM */
#if CONFIG(OPTION_BACKEND_NONE) || (CONFIG(USE_CBFS_FILE_OPTION_BACKEND) && ENV_SMM)
static inline unsigned int get_uint_option(const char *name, const unsigned int fallback)
{