[LinuxPPS] Linuxpps on 2.6.28 vs. ntpd 4.2.4p6

[Thorsten Mühlfelder]

Of course this should be 4.2.4p6. Just a typo.

4.2.4p6 was built with the same build script like 4.2.4p5:

	cd $startdir/src/${pkgname}-${pkgver}
        ./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc --bindir=/usr/sbin \
                --enable-all-clocks \
                --enable-parse-clocks || return 1

        make -j3 || return 1
        make DESTDIR=$startdir/pkg/ install

        # move all the usr/bin files to usr/sbin
        mv $startdir/pkg/usr/bin/* $startdir/pkg/usr/sbin
        rm -rfd $startdir/pkg/usr/bin



On Wed, 14 Jan 2009 16:19:28 -0800
"Hal V. Engel" <hvengel at astound.net> wrote:

> On Wednesday 14 January 2009 13:24:21 Thorsten Mühlfelder wrote:
> > Hi Heiko
> >
> > I've used kernel 2.6.28rc6 with ntp 4.2.4p5 for about 3 weeks without
> > problems on my test machines. Today I've done an upgrade to kernel
> > 2.6.28 and ntp 4.2.4p6. With this combination the ntpd doesn't use the
> > PPS signal. I've checked ntpd syslog entries but there was nothing
> > special. So I've decided to play with the different versions and these
> > are my results:
> >
> > 2.6.28rc6 + 4.2.4p5 = working
> > 2.6.28rc6 + 4.2.5p6 = not working
> > 2.6.28 + 4.2.4p5 = working
> > 2.6.28 + 4.2.5p6 = not working
> >
> > ppstest works in every case and restarting ppsldisc and ntp doesn't
> > change anything.
> > So the problem must be the ntpd 4.2.5p6.
> >
> > Greetings
> > Thorsten
> >
> > PS: I'm usin Meinberg DCF and GPS cards as time and PPS source in
> > different servers, too. But as PPS just uses the atom driver I don't
> > think it's a Meinberg related problem.
> 
> Above you wrote ntp 4.2.5p6 but I think you intended to write 4.2.4p6.  I am 
> using kernel 2.6.26 with ntp 4.2.4p6 and everything is working OK.  I am using 
> the Oncore driver.  Maybe there is a problem with the way 4.2.4p6 is built?
> 
> Hal
> 
> >
> > On Wed, 14 Jan 2009 12:42:54 +0100
> >
> > Heiko Gerstung <heiko.gerstung at meinberg.de> wrote:
> > > 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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> 
> 
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