GPIO_GPDR3
bus_space_write_4(sc->sc_iot, pxa2x0_gpio_ioh, GPIO_GPDR3, 0x01e3e10c);
bus_space_write_4(sc->sc_iot, pxa2x0_gpio_ioh, GPIO_GPDR3, sd.sd_gpdr3);
sd.sd_gpdr3 = bus_space_read_4(sc->sc_iot, pxa2x0_gpio_ioh, GPIO_GPDR3);