PL01XCOM_DR
uartaddr[PL01XCOM_DR / 4] = htole32(c);
uartaddr[PL01XCOM_DR / 4] = htole32(c);
uartaddr[PL01XCOM_DR / 4] = htole32(c);
uartaddr[PL01XCOM_DR / 4] = htole32(c);
PREAD1(pi, PL01XCOM_DR);
PWRITEM1(pi, PL01XCOM_DR, sc->sc_tba, n);
put[0] = PREAD1(pi, PL01XCOM_DR);
PWRITEM1(pi, PL01XCOM_DR, sc->sc_tba, n);
c = PREAD1(pi, PL01XCOM_DR);
cin = PREAD1(pi, PL01XCOM_DR);
PWRITE1(pi, PL01XCOM_DR, c);