ALTERA_TIMER_PERIODL_REG  150 arch/nios2/kernel/time.c 	timer_writew(timer, period, ALTERA_TIMER_PERIODL_REG);
ALTERA_TIMER_PERIODL_REG  299 arch/nios2/kernel/time.c 	timer_writew(&nios2_cs.timer, USHRT_MAX, ALTERA_TIMER_PERIODL_REG);