[LinuxPPS] Problems with ppstest and NTP

[Heiko Gerstung]

Found it. The documentation wiki says that the pps device nodes should 
have major 253 but it needs to be 254 ...

It works now (both ntp and ppstest), I will try to run some accuracy 
tests now with our GPS clocks...

Thanks a lot for your help,

 Best Regards,
   Heiko

Heiko Gerstung schrieb:
> Paul schrieb:
>   
>> I compiled with p3 so it just possble that something has changed. When
>> you look in config.h which options are defined? Is the HAVE_PPSAPI
>> there?
>>   
>>     
> Yes, it is. I do not think that something has changed with the PPS API 
> stuff from p3 to p4.
>
> Best Regards,
> Heiko
>
>   
>> Paul
>>
>> On Wed, 2008-01-09 at 13:54 +0100, Heiko Gerstung wrote:
>>   
>>     
>>> 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
>>>>>>>
>>>>>>>
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>>>>>>> Wiki: http://wiki.enneenne.com/index.php/LinuxPPS_support
>>>>>>>
>>>>>>>     
>>>>>>>         
>>>>>>>             
>>>>>>>               
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>>>>>> Wiki: http://wiki.enneenne.com/index.php/LinuxPPS_support
>>>>>>   
>>>>>>       
>>>>>>           
>>>>>>             
>>>>>     
>>>>>         
>>>>>           
>>>>   
>>>>       
>>>>         
>>>     
>>>       
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>>   
>>     
>
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