TIMER_ALARM_LOW
gf_iowrite32(0, base + TIMER_ALARM_LOW);
gf_iowrite32(lower_32_bits(now), base + TIMER_ALARM_LOW);
rtc_alarm_low = gf_ioread32(base + TIMER_ALARM_LOW);
gf_iowrite32(rtc_alarm64, base + TIMER_ALARM_LOW);