AUART_STAT_OERR
if (stat & AUART_STAT_OERR)
uart_insert_char(&s->port, stat, AUART_STAT_OERR, c, flag);
stat &= ~(AUART_STAT_OERR | AUART_STAT_BERR |
u->read_status_mask = AUART_STAT_OERR;
u->ignore_status_mask |= AUART_STAT_OERR;