AUART_STAT_BERR
if (stat & AUART_STAT_BERR) {
if (stat & AUART_STAT_BERR) {
stat &= ~(AUART_STAT_OERR | AUART_STAT_BERR |
u->read_status_mask |= AUART_STAT_BERR;
u->ignore_status_mask |= AUART_STAT_BERR;