[LinuxPPS] LinuxPPS + kernel 2.6.34 = ok

[Udo van den Heuvel]

On 2010-05-23 15:36, Remco dB wrote:
> Today I upgraded to kernel 2.6.34 and encountered no problems activating PPS.
> 
> I still use 'ttyctrl -X -s 18 /dev/ttyS0 &' to 'activate' PPS and had to 
> recompile my ntpd.

I just booted into 2.6.34 w/ ntpd 4.2.6p1 built against 2.6.34 sources.

I noticed this:
# cat /sys/devices/virtual/pps/pps0/{assert,clear}
1274686950.992846869#955
1274686008.261192728#12

I.e.: clear edge get stuck when ntpd is started.

So it doesn't work too well:

# ntpq -pn
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 127.127.1.0     .LOCL.          15 l 1055   64    0    0.000    0.000
 0.000
x127.127.20.0    .GPS.           14 l   14   16  377    0.000  -154.28
 4.069
x127.127.22.0    .PPS.            0 l   13   16  377    0.000   31.871
 3.523
 194.109.22.18   193.67.79.202    2 u   63   64  377   21.705   -2.669
12.313
 194.109.20.18   193.67.79.202    2 u    9   64  377   21.703    6.220
24.021
*193.67.79.202   .PPS.            1 u    4   64  377   21.738   -5.941
12.304
+193.79.237.14   .PPS.            1 u    9   64  377   21.743  -13.625
31.604
-83.163.219.98   .DCFa.           1 u   61   64  377   41.707  -22.226
19.735
+134.221.205.12  .PPS.            1 u   55   64  377   21.707   -8.760
25.043

How to fix this?


Udo