SSCOM_UBRDIV
bus_space_write_2(iot, ioh, SSCOM_UBRDIV, sc->sc_ubrdiv);
bus_space_write_2(iot, ioh, SSCOM_UBRDIV, rate);
WR4(sc, SSCOM_UBRDIV, ubrdiv);
OUTW(SSCOM_UBRDIV, rate);
*(volatile uint32_t*)(S3C2440_UART_BASE(0)+SSCOM_UBRDIV) =