Re: [Linuxptp-users] grandmaster with an H/P 3805A GPS disciplined osc

[Miroslav L. <mli...@re...>]

On Thu, Aug 22, 2013 at 12:48:51AM -0700, David Gravereaux wrote:
> So instead of phc2sys, I'm wanting a gps2phc+rtc ;)
> 
> If my head is screwed on right, this almost gets me there given system
> clock is the reference for start offset, but takes over from PPS, though
> not a physical signal to the NIC.
> 
>   phc2sys -wmql 7 -d /dev/pps0 -s CLOCK_REALTIME -c /dev/ptp0
> 
> If this is true, I'd be happy with this for the moment.

The PPS time stamps are always relative to the system clock, so it can
be used only with CLOCK_REALTIME as the slave clock. (phc2sys should
print an error message if not)

You can split it in to two phc2sys commands, one synchronizing the
system clock from the PPS (ntpd must be disabled or configured to not
touch the system clock) and the other synchronizing the PHC from the
system clock.

-- 
Miroslav Lichvar