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| author | zbao <fishbaozi@gmail.com> | 2012-08-02 19:02:26 +0800 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-08-02 23:40:09 +0200 |
| commit | a1e6a9c25a1d897fbb06f634bbee6e7983a95524 (patch) | |
| tree | 0d8617a90978ddc546582ba1e98dc3131c6dd77f /src/include/pc80/mc146818rtc.h | |
| parent | d462736dfbedba7daec0c9812470a88a535b7c43 (diff) | |
| download | coreboot-a1e6a9c25a1d897fbb06f634bbee6e7983a95524.tar.xz | |
RTC: Add a routine to check if the CMOS date is valid
If the CMOS is cleared or someone writes some random date/time
on purpose, the CMOS date register has a invalid date. This will
hurts some OS, like Windows 7, which hangs at MS logo forever.
When we detect that, we need to write a reasonable date in CMOS.
Alexandru Gagniuc:
Hmm, it would be interesting to use the date the coreboot image
was built and set that as the default date. At least until time
travel is invented.
Change-Id: Ic1c7a2d60e711265686441c77bdf7891a7efb42e
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: zbao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/1389
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Diffstat (limited to 'src/include/pc80/mc146818rtc.h')
| -rw-r--r-- | src/include/pc80/mc146818rtc.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/pc80/mc146818rtc.h b/src/include/pc80/mc146818rtc.h index 9f18ba49e8..a916761222 100644 --- a/src/include/pc80/mc146818rtc.h +++ b/src/include/pc80/mc146818rtc.h @@ -87,6 +87,10 @@ #define RTC_CLK_DAYOFMONTH 7 #define RTC_CLK_MONTH 8 #define RTC_CLK_YEAR 9 +#define RTC_CLK_ALTCENTURY 0x32 + +#define RTC_HAS_ALTCENTURY 1 +#define RTC_HAS_NO_ALTCENTURY 0 /* On PCs, the checksum is built only over bytes 16..45 */ #define PC_CKS_RANGE_START 16 @@ -136,6 +140,7 @@ static inline void cmos_write32(u8 offset, u32 value) #if !defined(__ROMCC__) void rtc_init(int invalid); +void rtc_check_update_cmos_date(u8 has_century); #if CONFIG_USE_OPTION_TABLE int set_option(const char *name, void *val); int get_option(void *dest, const char *name); |