[ntp:questions] ntpd connect gpsd shared memory driver

Richard Cagley rcagley at gmail.com
Tue Jun 18 15:50:44 UTC 2013

On Tue, Jun 18, 2013 at 12:22 AM, A C <agcarver+ntp at acarver.net> wrote:

> You need -n (lower case N) to force gpsd to start collecting data
> automatically.  It normally waits for something to connect to its TCP port
> and enable data collection (the WATCH command as you discovered). If you
> start with just:
> gpsd -bn /dev/ttyO0
> You'll find the SHMs are populated after a few seconds (once gpsd syncs
> with the data stream from the receiver).

Hmmm, i had tried the -n before. It doesn't seem to help. After several
minutes there is no change to  ntpq -p. Any other ideas for something
stupid I'm doing? Do you think it's a ntpd or gpsd issue...or something

After several minutes, no change to ntqp -p
/ # ntpq -p
     remote           refid      st t when poll reach   delay   offset
 SHM(0)          .SHM.            0 l    -   16    0    0.000    0.000
but gpsd seems to be active...

/ # gpsd -bn -N -D5 /dev/ttyO0
gpsd:INFO: launching (Version 3.9)
gpsd:IO: opening IPv4 socket
gpsd:INFO: listening on port 2947
gpsd:PROG: NTPDnew PPS source OMAP-SERIAL0 at ID 0
 shmat(0,0,0) suPPS source #0 "/dev/ttyO0" added
cceeded, segment 0
gpsd:PROG: NTPD shmat(32769,0,0) succeeded, segment 1
gpsd:PROG: NTPD shmat(65538,0,0) succeeded, segment 2
gpsd:PROG: NTPD shmat(98307,0,0) succeeded, segment 3
gpsd:PROG: PPS thread launched
gpsd:INFO: NTPD ntpd_link_activate: 1
gpsd:INFO: stashing device /dev/ttyO0 at slot 0
gpsd:PROG: no /etc/gpsd/device-hook present, skipped running ACTIVATE hook
gpsd:INFO: opening read-only GPS data source type 2 and at '/dev/ttyO0'
gpsd:PROG: PPS Create Thread gpsd_ppsmonitor
gpsd:PROG: PPS chrony socket /var/run/chrony.ttyO0.sock doesn't exist
gpsd:INFO: KPPS checking /sys/devices/virtual/pps/pps0/path, /dev/ttyO0
gpsd:INFO: KPPS caps 1133
gpsd:WARN: KPPS kernel PPS will be used
gpsd:PROG: KPPS assert 0.000000000, sequence: 0 - clear
 946685867.302809818, s1
gpsd:PROG: KPPS data: using clear
gpsd:INFO: KPPS cycle: 2060820377, duration:       0 @ 946685867.302809818
gpsd:INFO: PPS cycle: 2060820434, duration: 2060820434 @ 946685867.302866
gpsd:PROG: KPPS assert 946685867.402807225, sequence: 1 - clear
gpsd:PROG: KPPS data: using assert
gpsd:INFO: KPPS cycle: 2060920375, duration:   99997 @ 946685867.402807225
gpsd:INFO: speed 4800, 8N1
gpsd:PROG: no probe matched...
gpsd:INFO: gpsd_activate(): activated GPS (fd 4)
gpsd:INFO: device /dev/ttyO0 activated
gpsd:PROG: KPPS assert 946685867.402807225, sequence: 1 - clear
gpsd:PROG: KPPS data: using clear

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