[LinuxPPS] Linuxpps on 2.6.28 vs. ntpd 4.2.4p6

[Thorsten Mühlfelder]

On Thu, 15 Jan 2009 14:48:16 +0100
Heiko Gerstung <heiko.gerstung at meinberg.de> wrote:

> I got this to work fine by using Folkert's ppsldisc patch, great stuff!

Where can I get this patch?

> It turned out that I always have to start ppsldisc right before ntpd and 
> it seems that I have to kill and restart ppsldisc every time I connect 
> to the serial port again.

So ppldisc has to be restarted when ntpd is restarted?


> So, at least it works for now, but I have a new problem :-) More on that 
> in a separate mail ...
> 
> Regards,
> Heiko
> 
> 
> Heiko Gerstung schrieb:
> > Hi everybody!
> >
> > I am trying to prepare a new kernel for our series of NTP time server 
> > appliances called LANTIME (see our website if you are interested) but I 
> > have problems getting ntp-4.2.4p6 to work with my 2.6.28 kernel and the 
> > rc6 linuxpps patch.
> >
> > What already works is that if I start ppsldisc /dev/ttyS0 on a console, 
> > I can see that assert and clear events are correctly recognized in 
> > /sys/class/pps/pps/assert and clear and they represent the 200ms pulse 
> > width we are using on our GPS receivers.
> >
> > But for some it does not work when I start ppsldisc as a background 
> > process during startup. I can see that there are a number of events 
> > recorded because the assert file for example shows a timestamp and the 
> > event count, which can be #32 for example or #43 but does not recognize 
> > any further events until I "killall ppsldisc" and run ppsldisc on my 
> > console (in the foreground).
> >
> > Additionally, when I start ntpd, it cannot initialize the Atom driver 
> > and the parse driver also cannot setup PPS usage:
> >   
> >> Jan 14 09:17:19 LantimeV5 ntpd[13940]: PARSE receiver #0: parse_start: 
> >> could not set up PPS: Invalid argument
> >> Jan 14 09:17:19 LantimeV5 ntpd[13940]: PARSE receiver #0: 
> >> parse_ppsapi: time_pps_getcap failed: Bad file descriptor
> >> Jan 14 09:17:19 LantimeV5 ntpd[13940]: refclock_atom: time_pps_create 
> >> failed: Inappropriate ioctl for device 
> >>     
> > I am not running udev on my machine and therefore have to create the 
> > /dev/pps0 device node manually. I can see from /sys/class/pps/pps0/dev 
> > that this should be c254:0 and therefore run "mknod /dev/pps0 c 254 0" 
> > before doing anything else at startup.
> >
> > What am I missing? First and foremost I would like to get ntpd to use 
> > the PPS stuff, but if someone has any hints on why ppsldisc does not 
> > work when it is sent into the background, I would be grateful for any 
> > hints.
> >
> > Best Regards,
> >   Heiko
> >
> >
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> >   
> 
> 
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