[LinuxPPS] gps_nmea error

[Ritter, Nicholas]

I have patched ntpd, and built it. I have confirmed that I am getting
PPS signals via the kernel, and I started the newly patched ntpd with
the -g option for testing purposes. I noticed the following error in my
log:
 
Aug  5 09:33:05 RMSQSN1001 ntpd[29716]: refclock_nmea: found GPS source
"/dev/gps0"
Aug  5 09:33:05 RMSQSN1001 ntpd[29716]: refclock_nmea: try
"/dev/gpspps0" for PPS
Aug  5 09:33:05 RMSQSN1001 ntpd[29716]: refclock_nmea: found PPS source
"/dev/gpspps0"
Aug  5 09:33:05 RMSQSN1001 ntpd[29716]: refclock_nmea: time_pps_kcbind
failed: Operation not supported
Aug  5 09:33:05 RMSQSN1001 ntpd[29716]: frequency initialized -6.935 PPM
from /var/lib/ntp/drift
Aug  5 09:33:05 RMSQSN1001 kernel: PPS event at 4355090298
Aug  5 09:33:06 RMSQSN1001 kernel: PPS event at 4355091298
 
By error, I am referring to the  following line from above:
 
Aug  5 09:33:05 RMSQSN1001 ntpd[29716]: refclock_nmea: time_pps_kcbind
failed: Operation not supported
 
what does this error mean?
 
When I do an "ntpq -p" on the PPS/GPS ntp server I see the following:
 
[root at RMSQSN1001 ntpd]# ntpq -p
     remote           refid      st t when poll reach   delay   offset
jitter
========================================================================
======
*GPS_NMEA(0)     .GPS.            0 l    6   16  377    0.000    0.010
0.001
 time.nist.gov   .ACTS.           1 u   10   64   13   48.111  -310.07
0.246
+truechimer.cso. .PPS.            1 u   13   64   17   10.262  -303.05
0.148
 bonehed.lcs.mit .CDMA.           1 u   58   64    7   29.816  -304.25
0.570
+nist.netservice .ACTS.           1 u   32   64   17   14.068  -297.84
1.199
 
 
Am I understanding correctly that the GPS source is working, but
something about the PPS source is not? Am I also correct in assuming
that it could be a config problem in ntp.conf, or is it somewhere else?
I suspect I have my server sources setup wrong in ntp.conf, but not
sure. BTW - this is a 2.6.26 kernel with the 2.6.26 linuxpps patch, and
the nmea clock ref patch for ntp-4.2.4p4
 
 
 
Here is my ntp.conf file:
 
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
 
# Permit all access over the loopback interface.  This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1 
restrict -6 ::1
 
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
 
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.rhel.pool.ntp.org
#server 1.rhel.pool.ntp.org
#server 2.rhel.pool.ntp.org
 
#broadcast 192.168.1.255 key 42         # broadcast server
#broadcastclient                        # broadcast client
#broadcast 224.0.1.1 key 42             # multicast server
#multicastclient 224.0.1.1              # multicast client
#manycastserver 239.255.254.254         # manycast server
#manycastclient 239.255.254.254 key 42  # manycast client
 
# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available. 
#server 127.127.1.0     # local clock
#fudge  127.127.1.0 stratum 10  
 
#server 127.127.28.0 mode 2 minpoll 4 maxpoll 4
#fudge 127.127.28.0 time1 0.000 refid GPS
 
#server 127.127.28.1 minpoll 4 maxpoll 4 prefer
#fudge 127.127.28.1 refid GPS1
 
enable stats monitor PPS
 
#server 127.127.28.0 minpoll 4 version 4
#fudge 127.127.28.0 time1 0.000 refid GPS
 
#server 127.127.28.1 minpoll 4 version 4 prefer
#fudge 127.127.28.1 refid PPS


#server 127.127.28.0 minpoll 4 version 4
#fudge 127.127.28.0 time1 0.000 refid GPS flag3 1 flag2 0
 
#server 127.127.28.1 minpoll 4 version 4 prefer
#fudge 127.127.28.1 refid PPS flag3 1
 
server 127.127.20.0 prefer minpoll 4
fudge 127.127.20.0 flag3 1 flag2 0 time1 0.0
 
#server 0.pool.ntp.org version 4
#server 1.pool.ntp.org version 4
#server 2.pool.ntp.org version 4
#server 3.pool.ntp.org version 4
server time.nist.gov
server truechimer.cso.uiuc.edu
server bonehed.lcs.mit.edu
server nist.netservicesgroup.com
 

# 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 /var/lib/ntp/drift
 
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography. 
keys /etc/ntp/keys
 
# Specify the key identifiers which are trusted.
#trustedkey 4 8 42
 
# Specify the key identifier to use with the ntpdc utility.
#requestkey 8
 
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
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