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src/lib: Add FW_CONFIG_SOURCE_VPD 

Read fw_config value from VPD.
This new option can be used where chrome EC is not supported like
pre-silicon platform and fw_config can be updated by VPD tool in OS.

TEST= boot to OS and read fw_config from vpd
1. Boot to OS
2. Write "fw_config" in VPD
   ex) vpd -i "RW_VPD" -s "fw_config"="1"
3. reboot and check fw_config value from coreboot log

Signed-off-by: Wonkyu Kim <wonkyu.kim@intel.com>
Change-Id: I4df7d5612e18957416a40ab854fa63c8b11b4216
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58839
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
This commit is contained in:
Wonkyu Kim 2021-11-01 20:55:25 -07:00 committed by Paul Fagerburg
parent 3864973a09
commit 43e269239e
2 changed files with 22 additions and 0 deletions
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10
src/Kconfig
View File

@ -416,6 +416,16 @@ config FW_CONFIG_SOURCE_CBFS
local image to preempt the mainboard selected source and can be used as
FW_CONFIG_SOURCE_CHROMEEC_CBI fallback option.
config FW_CONFIG_SOURCE_VPD
bool "Obtain Firmware Configuration value from VPD"
depends on FW_CONFIG && VPD
default n
help
With this option enabled coreboot will look for the 32bit firmware
configuration value in VPD key name "fw_config". This option will
override other sources and allow the local image to preempt the mainboard
selected source and can be used for other FW_CONFIG_SOURCEs fallback option.
config HAVE_RAMPAYLOAD
bool

12
src/lib/fw_config.c
View File

@ -11,6 +11,7 @@
#include <lib.h>
#include <stdbool.h>
#include <stdint.h>
#include <drivers/vpd/vpd.h>
uint64_t fw_config_get(void)
{
@ -44,6 +45,17 @@ uint64_t fw_config_get(void)
fw_config_value);
}
if (CONFIG(FW_CONFIG_SOURCE_VPD) && fw_config_value == UNDEFINED_FW_CONFIG) {
int vpd_value;
if (vpd_get_int("fw_config", VPD_RW_THEN_RO, &vpd_value)) {
fw_config_value = vpd_value;
printk(BIOS_INFO, "FW_CONFIG value from VPD is 0x%" PRIx64 "\n",
fw_config_value);
} else
printk(BIOS_WARNING, "%s: Could not get fw_config from vpd\n",
__func__);
}
return fw_config_value;
}