INTDEF
intdef = bus_space_read_1(iot, ioh, INTDEF);
intdef = bus_space_read_1(iot, ioh, INTDEF);
bus_space_write_1(iot, ioh, INTDEF, (intdef | INTEN)); /* make sure we can interrupt */
intdef = bus_space_read_1(iot, ioh, INTDEF);
intdef = bus_space_read_1(iot, ioh, INTDEF);