> Apr 14 15:37:30 local ifcico.ttyS0[7913]: chat got "OK", continue
> Apr 14 15:38:40 local ifcico.ttyS0[7913]: chat got read return -1
> errno=4 : Interrupted system call
Odd that it returned "OK" when error 4 is supposed to indicate
"system locked". I don't know, but since you asked twice...
serial port settings via setserial? Something else is on the port?