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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)
This commit is contained in:
Duncan Laurie 2012-08-16 16:06:03 -07:00 committed by Stefan Reinauer
parent 93ded5905c
commit 5c103aa8ae
2 changed files with 6 additions and 4 deletions
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8
src/drivers/pc80/mc146818rtc.c
View File

@ -84,10 +84,10 @@ static void rtc_update_cmos_date(u8 has_century)
cmos_write(0, RTC_CLK_SECOND);
cmos_write(0, RTC_CLK_MINUTE);
cmos_write(1, RTC_CLK_HOUR);
cmos_write(COREBOOT_BUILD_WEEKDAY, RTC_CLK_DAYOFWEEK);
cmos_write(COREBOOT_BUILD_DAY, RTC_CLK_DAYOFMONTH);
cmos_write(COREBOOT_BUILD_MONTH, RTC_CLK_MINUTE);
cmos_write(COREBOOT_BUILD_YEAR, RTC_CLK_YEAR);
cmos_write(RTC_TO_BCD(COREBOOT_BUILD_WEEKDAY), RTC_CLK_DAYOFWEEK);
cmos_write(RTC_TO_BCD(COREBOOT_BUILD_DAY), RTC_CLK_DAYOFMONTH);
cmos_write(RTC_TO_BCD(COREBOOT_BUILD_MONTH), RTC_CLK_MINUTE);
cmos_write(RTC_TO_BCD(COREBOOT_BUILD_YEAR), RTC_CLK_YEAR);
if (has_century) cmos_write(0x20, RTC_CLK_ALTCENTURY);
}

2
src/include/pc80/mc146818rtc.h
View File

@ -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 */