[LinuxPPS] PPS/ntpd fails on fresh startup

[Cirilo Bernardo]

On Wed, Oct 15, 2008 at 8:57 PM, Luca Bertagnolio <time at berta.com> wrote:
> If I may... in the refclock_nmea.c source, I find only one single reference to
> LDISC, here is the relevant part of the code:
>
>        /*
>         * Open serial port. Use CLK line discipline, if available.
>         */
>        (void)sprintf(device, DEVICE, unit);
>
>        /*
>         * Opening the serial port with appropriate baudrate
>         * based on the value of bit 4.
>         */
>        if ( peer->ttl & 0x10 ) {
>                fd = refclock_open(device, 2*SPEED232, LDISC_CLK);
>                msyslog(LOG_NOTICE,
>                                "refclock_nmea : serial port baudrate
> set to 9600");
>        } else {
>                fd = refclock_open(device, SPEED232, LDISC_CLK);
>                msyslog(LOG_NOTICE,
>                                "refclock_nmea : serial port baudrate
> set to 4800");
>        }
>
> Are you trying to tell me that the issues we are facing might be related to that
> *one* single refclock_open call with the LDISC_CLK parameter set?
>
> Forgive me for the dumb question...  --Luca
>

You need to look at the logic to see what conditions would cause that
line to be executed; if it is executed then yes, linuxpps will lose
control.

- Cirilo