From 5c103aa8ae56c0758a3e8af11dc70fb62f833f7e Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Thu, 16 Aug 2012 16:06:03 -0700 Subject: 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 Reviewed-on: http://review.coreboot.org/1709 Reviewed-by: Marc Jones Tested-by: build bot (Jenkins) --- src/drivers/pc80/mc146818rtc.c | 8 ++++---- src/include/pc80/mc146818rtc.h | 2 ++ 2 files changed, 6 insertions(+), 4 deletions(-) (limited to 'src') diff --git a/src/drivers/pc80/mc146818rtc.c b/src/drivers/pc80/mc146818rtc.c index d832544b17..52cfb63275 100644 --- a/src/drivers/pc80/mc146818rtc.c +++ b/src/drivers/pc80/mc146818rtc.c @@ -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); } diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h index a916761222..61b522ca74 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 */ -- cgit v1.2.3