| Re: [chrony-users] using chronyd with gpsd, without PPS support |
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On Sun, Jan 16, 2011 at 11:58:23AM +1100, Michael Ashley wrote:
> Hi folks,
>
> Sorry if I'm missing something obvious, but is it possible for chronyd
> to synchronize with gpsd without LinuxPPS support?
Yes, it should work.
> My kernel (Debian squeeze 2.6.32-5-686) doesn't appear to have
> PPS. I'm using a version of gpsd pulled with git just now, and gpsd
> 2.95.
>
> I naively tried adding
>
> refclock SHM 1 poll 3 refid GPS1
>
> to my /etc/chrony.conf file, but it doesn't pick up anything from
> the GPS (which is working, confirmed by listening in to the gpsd
> socket).
>
> GPS1 appears in "sources" as:
>
> MS Name/IP address Stratum Poll LastRx Last sample
> ============================================================================
> #+ GPS1 0 3 10y +0ns[ +0ns] +/- 0ns
Do you get anything when the segment 0 (message decoded
timestamps) is used instead?
That would mean the communication between gpsd and chrony is working,
but gpsd doesn't provide the PPS timestamps.
What is the output from gpsd -n -N -D 6 /dev/ttyS0 | grep -i 'pps\|ntp' ?
--
Miroslav Lichvar
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