[coreboot-gerrit] [M] Change in coreboot[main]: drivers/option: Add CBFS file based option backend

[Nicholas Chin (Code Review)]

Attention is currently required from: Julius Werner, Subrata Banik.

Hello build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/85905?usp=email

to look at the new patch set (#6).

Change subject: drivers/option: Add CBFS file based option backend
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drivers/option: Add CBFS file based option backend

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 -i option/value -n
option_name`. For simplicity, options should be stored in the COREBOOT
(RO) FMAP region, which is the default for cbfstool.

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 
---
M src/Kconfig
M src/drivers/option/Makefile.mk
A src/drivers/option/cbfs_file_option.c
M src/include/option.h
4 files changed, 51 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/05/85905/6