[LinuxPPS] ntp 'bugs'

[Udo van den Heuvel]

Udo van den Heuvel wrote:
> First we check for pps on the NMEA device which in our case will fail
> but set the right line discipline so that the PPS device is created.
> Then we check for the PPS device which will give us pps.
> When the PPS device is not existing or if there is no pps we try the
> NMEA device once more (yes, stuff might have changed due to the line
> discipline thing; it is a matter of principle) and exit.

Attached is a still untested but cleaned up patch.
With the patch the line discipline code in Linux should work with the
NMEA refclock.
Please review and comment on the list on anything that may be wrong,
strange or hard to follow.

Udo
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