ASC_RXBUF_DUMMY_OE
c |= ASC_RXBUF_DUMMY_OE;
uart_insert_char(port, c, ASC_RXBUF_DUMMY_OE, c & 0xff, flag);
ascport->port.read_status_mask = ASC_RXBUF_DUMMY_OE;
ascport->port.ignore_status_mask |= ASC_RXBUF_DUMMY_OE;