SER_INT_SIGCHG
ipend |= SER_INT_SIGCHG;
ch[0]->ch_ipend |= SER_INT_SIGCHG;
ch[1]->ch_ipend |= SER_INT_SIGCHG;
uart_sched_softih(sc, SER_INT_SIGCHG);
if (ipend & SER_INT_SIGCHG)
case SER_INT_SIGCHG:
ipend |= SER_INT_SIGCHG;
ipend |= SER_INT_SIGCHG;
if (pend & SER_INT_SIGCHG) {