VRC2_EXGPINTEN
regs[2] = read_4(sc, VRC2_EXGPINTEN);
write_2(sc, VRC2_EXGPINTEN, sc->sc_intr_mask);
write_4(sc, VRC2_EXGPINTEN, sc->sc_intr_mask);
write_4(sc, VRC2_EXGPINTEN,
write_2(sc, VRC2_EXGPINTEN, sc->sc_intr_mask);