FCR_RCV_RST
#define FIFO_RCV_RST FCR_RCV_RST
fcr |= FCR_RCV_RST;
uart_setreg(bas, REG_FCR, FCR_ENABLE | FCR_XMT_RST | FCR_RCV_RST);
if ((value & FCR_RCV_RST) != 0)