Re: GPS time sync with chrony and ESE serial device

[Greg Troxel]

Devren Yener <address@hidden> writes:

> Greg, to respond to your suggestion about using PPS without gpsd — my
> challenge is figuring out how to get Linux to know that there is a PPS
> signal on my serial port. When I boot up my system, I have a /dev/ttyS0 but
> not a /dev/pps0. I have found three tools that can create a /dev/pps0,
> namely, (1) gpsd, (2) ldattach (pre-installed in my Ubuntu), and (3)
> ppsldisc (from the pps-tools package). I actually made the most progress
> with the last of these three; I am able to sync time gloriously with chrony
> for about five minutes, before the PPS device mysteriously stops working.
> Also, out of all these programs, only gpsd installs itself as a systemd
> service, which is what I really want, so that it starts consistently on
> boot.

I have only done this on NetBSD, which doesn't really have the concept
of /dev/ppsN, pps being associated with a line discipline that can be
invoked on a esrial port.   So I don't have any great wisdom for you.