Martin Roth has uploaded this change for review.

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src/soc/stoneyridge: Add a check for CMOS failure

BUG=b:77345148
TEST=Pull power from grunt, verify CMOS power failure is detected.
Reboot and verify that CMOS power failure is not detected.

Change-Id: Idbf0254e197a6d282e618a98bced52ea5a44917f
Signed-off-by: Martin Roth <martinroth@google.com>
---
M src/soc/amd/stoneyridge/pmutil.c
1 file changed, 3 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/68/25468/1

diff --git a/src/soc/amd/stoneyridge/pmutil.c b/src/soc/amd/stoneyridge/pmutil.c
index 25c9ec1..baabba5 100644
--- a/src/soc/amd/stoneyridge/pmutil.c
+++ b/src/soc/amd/stoneyridge/pmutil.c
@@ -17,11 +17,12 @@
 #include <soc/southbridge.h>
 #include <security/vboot/vboot_common.h>
 #include <security/vboot/vbnv.h>
+#include <pc80/mc146818rtc.h>
 
 int vbnv_cmos_failed(void)
 {
-	/* FIXME: RTC failure checking not supported. */
-	return 0;
+	/* If CMOS power has failed, the century will be set to 0xff */
+	return cmos_read(RTC_CLK_ALTCENTURY) == 0xff;
 }
 
 int vboot_platform_is_resuming(void)

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