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Date: Sat, 25 Nov 2006 05:20:50 +0200
From: Bo Granlund <granbo@tonnikala.org>
To: freebsd-usb@freebsd.org
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Subject: USB GPS receiver as reference clock
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Hi,

I have in my posession a Globalsat BU-353 GPS receiver that I would like to
use as a NMEA time reference with Freebsd ntpd. The device identifies with
freebsd as:

ugen0: Prolific Technology Inc. USB-Serial Controller, rev 1.10/3.00, addr 2

I'm running 6.2-RC1. I have tried to search with google for hints howto
configure this device with ntpd. I have the following /etc/ntp.conf:

------8<--------8<--------8<--------8<
enable stats monitor pps
server 127.127.20.1
driftfile /etc/ntp/ntp.drift
logconfig +clockall
------8<--------8<--------8<--------8<

As far as I understand this 127.127.20.1 uses nmea and tries to open
/dev/gps1 device for NMEA output. What device file should I link /dev/gps1
to, and if it doesn't exist, how do I create it?

Any hints will be greatly appreciated. I hope this is not simply a matter of
RTFM since I have searched the net quite extensively for any hints. :)

kind regards,
Bo Granlund