AT91_RTC_MR
u32 mr = at91_rtc_read(AT91_RTC_MR);
mr = at91_rtc_read(AT91_RTC_MR);
at91_rtc_write(AT91_RTC_MR, mr & ~AT91_RTC_NEGPPM);
at91_rtc_write(AT91_RTC_MR, mr);
at91_rtc_write(AT91_RTC_MR, at91_rtc_read(AT91_RTC_MR) & ~AT91_RTC_HRMOD);