[Thumbgps-devel] Navisys GR-601W

[Jim Thompson]

ntpd won't enable the PPS stuff, because the ioctl to 'discover' same fails.

covered on-list back in June/July


On Sep 24, 2012, at 8:58 PM, "Gary E. Miller" <gem at rellim.com> wrote:

> Yo Jim!
> 
> On Mon, 24 Sep 2012 20:49:42 -0500
> Jim Thompson <jim at netgate.com> wrote:
> 
>> 
>> On Sep 24, 2012, at 5:32 PM, Gary E. Miller <gem at rellim.com> wrote:
>> 
>>> Yo Jim!
>>> 
>>> On Sun, 23 Sep 2012 00:07:43 -0500
>>> Jim Thompson <jim at netgate.com> wrote:
>>> 
>>>> They don't work that we'll on FreeBSD. 
>>> 
>>> Really?  First I've heard of it.  What's the issue?
>> 
>> In a word: jitter
> 
> And how much jitter?  The lack of RFC2783 should not be noticeable since
> the jitter on the USB serial is so large.  RFC2783 helps in the
> micro Second range and the USB serial is in the milli Second range.
> 
> So with, and without you are going to get about 1 milli Second jitter.
> 
> So, what problem are you pointing up with *BSD?
> 
>> Compare:
>> http://fxr.watson.org/fxr/source/dev/uart/uart_core.c?v=FREEBSD9
>> and
>> http://fxr.watson.org/fxr/source/dev/sio/sio.c?v=FREEBSD9
>> and
>> http://fxr.watson.org/fxr/source/pc98/cbus/sio.c?v=FREEBSD9
>> 
>> to anything found in
>> 
>> http://fxr.watson.org/fxr/source/dev/usb/serial/?v=FREEBSD9
> 
> Not sure what you are trying to show me.
> 
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
> 	gem at rellim.com  Tel:+1(541)382-8588