Hello,
I am trying to set up an NTP server using the Garmin GPS-18 as the reference
clock. I think I'm most of the way there, but I have a couple of questions.
Firstly, here is the output from ntpq:
remote refid st t when poll reach delay offset jitter
==============================================================================
LOCAL(0) .LOCL. 10 l 2028 64 0 0.000 0.000 0.000
*GPS_NMEA(0) .GPS. 0 l 43 64 377 0.000 -10.969 11.575
So, it looks like its synchronising to the NMEA data coming from the GPS
receiver without any problems, but is the PPS working?
I'm fairly sure PPS is working, because ppstest shows:
trying PPS source "/dev/gpspps0"
found PPS source "/dev/gpspps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1323090421.923486039, sequence: 8369 - clear
1323083494.562494878, sequence: 133
source 0 - assert 1323090422.923554857, sequence: 8370 - clear
1323083494.562494878, sequence: 133
source 0 - assert 1323090423.923625515, sequence: 8371 - clear
1323083494.562494878, sequence: 133
source 0 - assert 1323090424.923692379, sequence: 8372 - clear
1323083494.562494878, sequence: 133
source 0 - assert 1323090425.923762947, sequence: 8373 - clear
1323083494.562494878, sequence: 133
So, I'm guessing it must be a problem with my ntp.conf. The top part of this is
shown below:
server 127.127.1.0 # local clock
fudge 127.127.1.0 stratum 10
#
# NTP server (list one or more) to synchronize with:
#server pool.ntp.org iburst
# LinuxPPS: Garmin GPS-18
server 127.127.20.0 mode 0 prefer
fudge 127.127.20.0 stratum 0 flag1 1 flag2 0 time2 0.600
#
# Drift file. Put this in a directory which the daemon can write to.
# No symbolic links allowed, either, since the daemon updates the file
# by creating a temporary in the same directory and then rename()'ing
# it to the file.
#
driftfile /etc/ntp/drift
Just for info, the OS is Slackware 13.37, but I have removed the as-installed
NTP package, and downloaded and built NTP 4.2.6.
So, to summarise my questions:
1) Is ntpd getting the PPS information?
2) Should I put the "ldattach 18 /dev/ttyS0" command in rc.local - currently
I'm running it manually after each boot.
Thanks!
Paul.--
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