AT91_RTC_ACKUPD
at91_rtc_write_ier(AT91_RTC_ACKUPD);
at91_rtc_write_idr(AT91_RTC_ACKUPD);
if (rtsr & AT91_RTC_ACKUPD)
at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |