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authorTimothy Pearson <tpearson@raptorengineeringinc.com>2015-02-14 16:15:31 -0600
committerAlexandru Gagniuc <mr.nuke.me@gmail.com>2015-02-16 08:36:37 +0100
commitf20c6e81fe2c12c1ff896f803cdc16849856a5c3 (patch)
treed9f19e6172bb44f405b161111c0d847c3af36c7f /src
parent5fc1ad101cd69fa91e2c33761aa45b69d535ef85 (diff)
downloadcoreboot-f20c6e81fe2c12c1ff896f803cdc16849856a5c3.tar.xz
nvram: Add option to reset NVRAM to default parameters on every boot
In specific configurations, such as homogeneous supercomputing systems, changeable NVRAM parameters are more of a liability than a useful tool. This patch allows a coreboot image to be compiled that will always set the NVRAM parameters to their default values, reducing maintainance overhead on large clusters. Change-Id: Ic03e34211d4a58cd60740f2d9a6b50e11fe85822 Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com> Reviewed-on: http://review.coreboot.org/8446 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/Kconfig9
-rw-r--r--src/arch/x86/include/bootblock_common.h2
-rw-r--r--src/drivers/pc80/mc146818rtc.c3
3 files changed, 13 insertions, 1 deletions
diff --git a/src/Kconfig b/src/Kconfig
index 4c80f34573..a0758bcf22 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -116,6 +116,15 @@ config USE_OPTION_TABLE
Enable this option if coreboot shall read options from the "CMOS"
NVRAM instead of using hard-coded values.
+config STATIC_OPTION_TABLE
+ bool "Load default configuration values into CMOS on each boot"
+ default n
+ depends on USE_OPTION_TABLE
+ help
+ Enable this option to reset "CMOS" NVRAM values to default on
+ every boot. Use this if you want the NVRAM configuration to
+ never be modified from its default values.
+
config COMPRESS_RAMSTAGE
bool "Compress ramstage with LZMA"
default y
diff --git a/src/arch/x86/include/bootblock_common.h b/src/arch/x86/include/bootblock_common.h
index 276b514b31..b4100b73a2 100644
--- a/src/arch/x86/include/bootblock_common.h
+++ b/src/arch/x86/include/bootblock_common.h
@@ -32,7 +32,7 @@ static void bootblock_mainboard_init(void)
#if CONFIG_USE_OPTION_TABLE
static void sanitize_cmos(void)
{
- if (cmos_error() || !cmos_chksum_valid()) {
+ if (cmos_error() || !cmos_chksum_valid() || IS_ENABLED(CONFIG_STATIC_OPTION_TABLE)) {
unsigned char *cmos_default = (unsigned char*)walkcbfs("cmos.default");
if (cmos_default) {
int i;
diff --git a/src/drivers/pc80/mc146818rtc.c b/src/drivers/pc80/mc146818rtc.c
index b18f22f43d..fe669caa98 100644
--- a/src/drivers/pc80/mc146818rtc.c
+++ b/src/drivers/pc80/mc146818rtc.c
@@ -56,6 +56,9 @@ static void cmos_reset_date(void)
static int cmos_checksum_valid(int range_start, int range_end, int cks_loc)
{
+ if (IS_ENABLED(CONFIG_STATIC_OPTION_TABLE))
+ return 1;
+
int i;
u16 sum, old_sum;
sum = 0;