ghd_timer_init
ghd_timer_init(&ata_timer_conf, drv_usectohz(ata_watchdog_usec));
void ghd_timer_init(tmr_t *tmrp, long ticks);
ghd_timer_init(&tmr_conf, 0);
void ghd_timer_init(tmr_t *tmrp, clock_t ticks);