[LinuxPPS] Problems with ppstest and NTP

[Heiko Gerstung]

Paul schrieb:
> I am using the Atom driver with a GPS receiver (there are issues with
> the time output on some GPS modules, but the PPS is rock solid). Are you
> compiling the ntp with the atom driver or have you patched in some way?
> When the 'new' kernel came out I tried the nmea patch out of curiosity,
> had problems, but the dropped it because it was of no interest to me.
>   

NTP (I use a vanilla 4.2.4p4)  has been definitely compiled with atom 
support, you can tell from the error message the atom refclock driver 
gives me:

Jan  9 10:46:07 xxx daemon.err ntpd[5675]: refclock_atom: 
time_pps_create failed: Invalid argument


If NTPD would not have been built with the atom driver, it says 
something like "unknown refclock 22". Additionally, the driver for our 
own GPS clocks (parse driver, #8) shows the same error message when 
trying to access the PPS and this driver works fine (without PPS support 
of course) ...

Best Regards,
 Heiko


>
> Paul
>
> On Wed, 2008-01-09 at 12:55 +0100, Heiko Gerstung wrote:
>   
>> Paul,
>>
>> thanks for your comments. The clear/assert events are working fine and I 
>> would have no problem letting ppstest go, but my problem is that NTP 
>> cannot use the pps source as well despite the fact that Rodolfo states 
>> that at least the Atom driver of NTP should work without any modification.
>>
>> Best Regards,
>> Heiko
>>
>>
>> Paul schrieb:
>>     
>>> If the clear/asserts change in /sys/class/pps/pps0/assert
>>> or /sys/class/pps/pps0/clear all is well. I think the debugging output
>>> is more a developer tool.
>>>
>>> Paul
>>>
>>> On Wed, 2008-01-09 at 12:08 +0100, Heiko Gerstung wrote:
>>>   
>>>       
>>>> Hi there!
>>>>
>>>> I just managed to get LinuxPPS (ntp-pps-2.6.23-quater.diff) to run on 
>>>> one of our embedded systems (kernel 2.6.23.12, i386 arch). I tried to 
>>>> follow the instructions on
>>>> http://wiki.enneenne.com/index.php/LinuxPPS_support
>>>>
>>>> but I have a few problems/comments:
>>>>
>>>> - when I try to fire up ppstest, I get:
>>>> /ppstest /dev/pps0
>>>> trying PPS source "/dev/pps0"
>>>> cannot create a PPS source from device "/dev/pps0" (Operation not supported)
>>>>
>>>> My pps0 device looks OK to me:
>>>>  ls -l /dev/pps0
>>>> crwxrwxrwx    1 root     root     253,   0 Jan  9 10:48 /dev/pps0
>>>>
>>>>
>>>> And the debugging output looks fine, too:
>>>> PPS event on source 0 at 1199876811.203122984
>>>> capture clear seq #1260 for source 0
>>>>
>>>> It seems that ntpd has the same problems here:
>>>> Jan  9 10:46:07 xxx daemon.err ntpd[5675]: refclock_atom: 
>>>> time_pps_create failed: Invalid argument
>>>> Jan  9 10:49:50 xxx daemon.notice ntpd[6239]: PARSE receiver #0: 
>>>> parse_start: could not set up PPS: Invalid argument
>>>>
>>>>
>>>> Any hint what I could check?
>>>>
>>>> Thanks in advance,
>>>>  Heiko
>>>>
>>>>
>>>> _______________________________________________
>>>> LinuxPPS mailing list
>>>> LinuxPPS at ml.enneenne.com
>>>> http://ml.enneenne.com/cgi-bin/mailman/listinfo/linuxpps
>>>> Wiki: http://wiki.enneenne.com/index.php/LinuxPPS_support
>>>>
>>>>     
>>>>         
>>> _______________________________________________
>>> LinuxPPS mailing list
>>> LinuxPPS at ml.enneenne.com
>>> http://ml.enneenne.com/cgi-bin/mailman/listinfo/linuxpps
>>> Wiki: http://wiki.enneenne.com/index.php/LinuxPPS_support
>>>   
>>>       
>>     
>
>