@@ -247,7 +247,15 @@ static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
rtc_set_time(s);
}
}
- s->cmos_data[RTC_REG_B] = data;
+ if (((s->cmos_data[RTC_REG_B] ^ data) & (REG_B_DM | REG_B_24H)) &&
+ !(data & REG_B_SET)) {
+ /* If the time format has changed and not in set mode,
+ update the registers immediately. */
+ s->cmos_data[RTC_REG_B] = data;
+ rtc_copy_date(s);
+ } else {
+ s->cmos_data[RTC_REG_B] = data;
+ }
rtc_timer_update(s, qemu_get_clock(rtc_clock));
break;
case RTC_REG_C:
For some unknown reason, the MIPS kernel briefly changes the RTC to binary mode during boot, switch back to BCD mode and read the time. As the registers are updated only every second, they may still be in the old format when they are read. This patch forces a register update immediately after a format change (BCD/binary or 12/24H). This avoid long fsck during boot due to time wrap. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> --- hw/mc146818rtc.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-)