SIP_IMR
CSR_WRITE(l, SIP_IMR, 0);
bus_space_write_4(st, sh, SIP_IMR, 0);
bus_space_write_4(st, sh, SIP_IMR, sc->sc_imr);
bus_space_write_4(sc->sc_st, sc->sc_sh, SIP_IMR, sc->sc_imr);