GPIO_GAFR1_L
bus_space_write_4(sc->sc_iot, pxa2x0_gpio_ioh, GPIO_GAFR1_L, sd.sd_gafr1_l);
sd.sd_gafr1_l = bus_space_read_4(sc->sc_iot, pxa2x0_gpio_ioh, GPIO_GAFR1_L);