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src/lib/fw_config: Change fw_config sources priority 

Request fw_config values from various sources (as enabled via Kconfig)
until a valid value has been read.
With this change, Chrome EC CBI takes precedence over CBFS fw_config.

TEST=select both configs and check fallback behavior.
1. select both FW_CONFIG_SOURCE_CHROMEEC_CBI and FW_CONFIG_SOURCE_CBFS
2. check log for reading fw_config from CBI and CBFS

Signed-off-by: Wonkyu Kim <wonkyu.kim@intel.com>
Change-Id: I215c13a4fcb9dc3b94f73c770e704d4e353e9cff
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58833
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 20:15:30 -07:00 committed by Paul Fagerburg
parent dc45951e88
commit 3864973a09
2 changed files with 29 additions and 29 deletions
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21
src/Kconfig
View File

@ -395,16 +395,6 @@ config FW_CONFIG
Enable support for probing devices with fw_config. This is a simple
bitmask broken into fields and options for probing.
config FW_CONFIG_SOURCE_CBFS
bool "Obtain Firmware Configuration value from CBFS"
depends on FW_CONFIG
default n
help
With this option enabled coreboot will look for the 32bit firmware
configuration value in CBFS at the selected prefix with the file name
"fw_config". This option will override other sources and allow the
local image to preempt the mainboard selected source.
config FW_CONFIG_SOURCE_CHROMEEC_CBI
bool "Obtain Firmware Configuration value from Google Chrome EC CBI"
depends on FW_CONFIG && EC_GOOGLE_CHROMEEC
@ -415,6 +405,17 @@ config FW_CONFIG_SOURCE_CHROMEEC_CBI
is not tried if FW_CONFIG_SOURCE_CBFS is enabled and the value was
found in CBFS.
config FW_CONFIG_SOURCE_CBFS
bool "Obtain Firmware Configuration value from CBFS"
depends on FW_CONFIG
default n
help
With this option enabled coreboot will look for the 32bit firmware
configuration value in CBFS at the selected prefix with the file name
"fw_config". This option will override other sources and allow the
local image to preempt the mainboard selected source and can be used as
FW_CONFIG_SOURCE_CHROMEEC_CBI fallback option.
config HAVE_RAMPAYLOAD
bool

37
src/lib/fw_config.c
View File

@ -21,30 +21,29 @@ uint64_t fw_config_get(void)
if (fw_config_value_initialized)
return fw_config_value;
fw_config_value_initialized = true;
/* Look in CBFS to allow override of value. */
if (CONFIG(FW_CONFIG_SOURCE_CBFS)) {
if (cbfs_load(CONFIG_CBFS_PREFIX "/fw_config", &fw_config_value,
sizeof(fw_config_value)) != sizeof(fw_config_value)) {
printk(BIOS_WARNING, "%s: Could not get fw_config from CBFS\n",
__func__);
fw_config_value = UNDEFINED_FW_CONFIG;
} else {
printk(BIOS_INFO, "FW_CONFIG value from CBFS is 0x%" PRIx64 "\n",
fw_config_value);
return fw_config_value;
}
}
fw_config_value = UNDEFINED_FW_CONFIG;
/* Read the value from EC CBI. */
if (CONFIG(FW_CONFIG_SOURCE_CHROMEEC_CBI)) {
if (google_chromeec_cbi_get_fw_config(&fw_config_value)) {
printk(BIOS_WARNING, "%s: Could not get fw_config from EC\n", __func__);
fw_config_value = UNDEFINED_FW_CONFIG;
}
if (google_chromeec_cbi_get_fw_config(&fw_config_value))
printk(BIOS_WARNING, "%s: Could not get fw_config from CBI\n",
__func__);
else
printk(BIOS_INFO, "FW_CONFIG value from CBI is 0x%" PRIx64 "\n",
fw_config_value);
}
/* Look in CBFS to allow override of value. */
if (CONFIG(FW_CONFIG_SOURCE_CBFS) && fw_config_value == UNDEFINED_FW_CONFIG) {
if (cbfs_load(CONFIG_CBFS_PREFIX "/fw_config", &fw_config_value,
sizeof(fw_config_value)) != sizeof(fw_config_value))
printk(BIOS_WARNING, "%s: Could not get fw_config from CBFS\n",
__func__);
else
printk(BIOS_INFO, "FW_CONFIG value from CBFS is 0x%" PRIx64 "\n",
fw_config_value);
}
printk(BIOS_INFO, "FW_CONFIG value is 0x%" PRIx64 "\n", fw_config_value);
return fw_config_value;
}