SSCOM_UTRSTAT
while (!ISSET(bus_space_read_1(sscomconstag, sscomconsioh, SSCOM_UTRSTAT),
SSCOM_UTRSTAT), UTRSTAT_TXEMPTY) && --timo)
stat = bus_space_read_1(iot, ioh, SSCOM_UTRSTAT);
(bus_space_read_1((iot), (ioh), SSCOM_UTRSTAT) & UTRSTAT_RXREADY)
ack = RD4(sc, SSCOM_UTRSTAT);
WR4(sc, SSCOM_UTRSTAT, ack);
#define sscom_rxrdy() (INB(SSCOM_UTRSTAT) & UTRSTAT_RXREADY)
stat = CSR_READ(S3C2440_UART_BASE(0) + SSCOM_UTRSTAT);