[coreboot-gerrit] Patch set updated for coreboot: b4925b7 intel/fsp_baytrail: Clear the GNVS area prior to filling
Scott Radcliffe (sradcliffe@microind.com)
gerrit at coreboot.org
Mon Oct 13 15:42:11 CEST 2014
Scott Radcliffe (sradcliffe at microind.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/7040
-gerrit
commit b4925b77c0cde5ffb671dfef7448dbcc0c12e42c
Author: Scott Radcliffe <sradcliffe at microind.com>
Date: Fri Oct 10 16:26:05 2014 -0400
intel/fsp_baytrail: Clear the GNVS area prior to filling
Zero out the GNVS area so that uninitialized portions are defined.
Tests using Microsoft Windows (XP/7/8) gave a bluescreen bugcheck: A5
(ACPI_BIOS_ERROR) with first parameter 0x00001000
(ACPI_BIOS_USING_OS_MEMORY). Some ACPI enumerated devices use the
GNVS area to define whether they're enabled and their MMIO regions. On my
custom baytrail-based board and build, these devices are disabled but GNVS
had uninitialized data indicating the devices were enabled with improper
MMIO regions.
Should investigate further to see where the GNVS device values are set
if enabled and make sure they are set to valid values even when the
devices are disabled via the mainboard/devicetree.cb.
Change-Id: I2b575c65bfaab58ae6206ac6f457c259c27a7d97
Signed-off-by: Scott Radcliffe <sradcliffe at microind.com>
---
src/soc/intel/fsp_baytrail/acpi.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/soc/intel/fsp_baytrail/acpi.c b/src/soc/intel/fsp_baytrail/acpi.c
index dece178..fb0dc87 100644
--- a/src/soc/intel/fsp_baytrail/acpi.c
+++ b/src/soc/intel/fsp_baytrail/acpi.c
@@ -88,6 +88,9 @@ static acpi_cstate_t cstate_map[] = {
void acpi_init_gnvs(global_nvs_t *gnvs)
{
+ /* Clear gnvs area so uninitialized portions are defined */
+ memset(gnvs, 0, sizeof(*gnvs));
+
/* CPU core count */
gnvs->pcnt = dev_count_cpu();
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