[LinuxPPS] no pps?

Udo van den Heuvel udovdh at xs4all.nl
Thu Mar 26 16:33:26 CET 2009


Hello,

Something strange occurred:

# ntpq -pn
      remote           refid      st t when poll reach   delay   offset 
  jitter
==============================================================================
  127.127.1.0     .LOCL.          15 l   38   64  377    0.000    0.000 
   0.002
  127.127.20.0    .GPS.           14 l    -   16    0    0.000    0.000 
   0.002
  127.127.22.0    .PPS.            0 l    -   16    0    0.000    0.000 
   0.002
+194.109.22.18   193.67.79.202    2 u   19   64  377    8.155  -85.073 
  4.854
  194.109.20.18   193.79.237.14    2 u   50   64  377    8.260  -84.352 
   3.458
+193.67.79.202   .PPS.            1 u   26   64  377   11.151  -84.027 
  7.609
*193.79.237.14   .PPS.            1 u   43   64  377    9.203  -84.055 
  4.289
+80.126.110.251  .DCFa.           1 u   56   64  377   25.081  -82.351 
  7.702
+134.221.205.12  .PPS.            1 u   37   64  377   11.331  -84.440 
  3.881
[root at epia]# cat /sys/devices/virtual/pps/pps0/{assert,clear}
1238081469.149995461#11832
1238081468.349993811#11832
[root at epia]# cat /sys/devices/virtual/pps/pps0/{assert,clear}
1238081469.149995461#11832
1238081469.349995738#11833
[root at epia]# cat /sys/devices/virtual/pps/pps0/{assert,clear}
1238081470.149998987#11833
1238081470.350000044#11834
[root at epia]# ls -l /dev/*ps*
lrwxrwxrwx 1 root root      5 2009-02-06 17:25 /dev/gps0 -> ttyS0
lrwxrwxrwx 1 root root      4 2009-03-26 13:13 /dev/gpspps0 -> pps0
crw-rw---- 1 root tty  254, 0 2009-03-26 13:13 /dev/pps0
[root at epia]#


So yes, we have pps on the serial port.
Yes we have the pps device.
And I did restart ntpd.
So...?



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