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