RA_IRQ_TIMER0
[RA_IRQ_TIMER0] = "intc timer0",
[RA_IRQ_TIMER0] = INT_TIMER0,
[INT_TIMER0] = RA_IRQ_TIMER0,
sc->sc_ih = ra_intr_establish(RA_IRQ_TIMER0, ra_wdog_timer0, sc, 0);