BTW: [root at epia ppsctl]# /bin/setserial /dev/ttyS0 hardpps [root at epia ppsctl]# /bin/setserial /dev/ttyS0 /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4, Flags: low_latency Why don't I see a hardpps flag?