SR_OVR
sr &= SR_PE | SR_FE | SR_OVR | SR_BRK;
else if (sr & SR_OVR) {
else if (sr & SR_OVR)
uart_insert_char(port, sr, SR_OVR, ch, flag);
port->read_status_mask = SR_OVR;
port->ignore_status_mask |= SR_PE | SR_OVR | SR_FE | SR_BRK;