M_DUART_OVRUN_ERR
M_DUART_PARITY_ERR | M_DUART_OVRUN_ERR))) {
if (status & M_DUART_OVRUN_ERR)
uart_insert_char(uport, status, M_DUART_OVRUN_ERR, ch, flag);
uport->read_status_mask = M_DUART_OVRUN_ERR;
uport->ignore_status_mask |= M_DUART_OVRUN_ERR;