PIOC_CM_ENTER_666
piocgetid(iot, ioh, PIOC_CM_ENTER_666, &id, &rev);
piocgetid(iot, ioh, PIOC_CM_ENTER_666, &id, &rev);
bus_space_write_1(iot, ioh, PIOC_CM_SELECT_REG, PIOC_CM_ENTER_666);
bus_space_write_1(iot, ioh, PIOC_CM_SELECT_REG, PIOC_CM_ENTER_666);