OWL_UART_STAT_RXER
if (stat & OWL_UART_STAT_RXER)
| OWL_UART_STAT_RXER | OWL_UART_STAT_TFER | OWL_UART_STAT_RXST;
port->read_status_mask |= OWL_UART_STAT_RXER;