RTC: Write build date in BCD when clearing RTC CMOS
Check the RTC on boot after RTC battery failure and ensure
that the reported build date matches what is reported:
> grep ^rtc /proc/driver/rtc
rtc_time : 01:00:21
rtc_date : 2012-08-16
Change-Id: If23f436796754c68ae6244ef7633ff4fa0a93603
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1709
Reviewed-by: Marc Jones <marcj303@gmail.com>
Tested-by: build bot (Jenkins)
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h
index a916761..61b522c 100644
--- a/src/include/pc80/mc146818rtc.h
+++ b/src/include/pc80/mc146818rtc.h
@@ -63,6 +63,8 @@
# define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */
# define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */
+#define RTC_TO_BCD(value) (((value / 10) << 4) | (value % 10))
+
/**********************************************************************/
#define RTC_INTR_FLAGS RTC_REG_C
/* caution - cleared by read */