[ntp:questions] PPS signal from Garmin GPS 18x LVC

Greg Troxel gdt at ir.bbn.com
Mon Dec 30 14:56:18 UTC 2013

David Lord <snews at lordynet.org> writes:

> Hal Murray wrote:
>> In article <4fh6pa-869.ln1 at ns2.lordynet.org.uk>,
>>  David Lord <snews at lordynet.org> writes:
>>> I'm using NetBSD with ntpd 4.2.7p401 and type 22 driver for
>>> PPS but I found I needed
>>> On my setup, if pps isn't picked up within some short period
>>> it's likely not synced at all. I usually reboot which seems to
>>> always lock to pps within a few minutes, rather than  try
>>> restarting ntpd which sometimes never syncs to pps.
>> There is a bug in the NetBSD kernel.  Once ntpd uses PPS,
>> it's all used up.  Restarting ntpd won't be able to use it again.
>> Rebooting fixes it.
> Ouch
> I'll investigate

I have a pending patch to add PPS to ucom(4), for the GR601-W.   Please
let me know if you find any bugs, and I can review the patch and commit
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