[LinuxPPS] refclock_nmea: cannot find PPS path "/dev/ttyS0" in the system

[Udo van den Heuvel]

Rodolfo Giometti wrote:
>> May  5 20:24:53 epia ntpd[4949]: refclock_nmea: cannot find PPS path
>> "/dev/ttyS0" in the system
>> May  5 20:24:53 epia ntpd[4949]: configuration of 127.127.20.0 failed
>>
>> (even after I try setserial hardpps or ppsctl enable)
>>
>> What now?
> 
> What about sysfs entries?

I did not see assert/clear occur.

> Can you please report the kernel messages?

I did not have debugging enabled. I will have to try with debugging.
What else could I prepare?