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From: Jim Thompson <jim@netgate.com>
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Subject: Re: [Thumbgps-devel] Navisys GR-601W
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On Sep 24, 2012, at 5:32 PM, Gary E. Miller <gem@rellim.com> wrote:

> Yo Jim!
>=20
> On Sun, 23 Sep 2012 00:07:43 -0500
> Jim Thompson <jim@netgate.com> wrote:
>=20
>> They don't work that we'll on FreeBSD.=20
>=20
> Really?  First I've heard of it.  What's the issue?

In a word: jitter

The PPS API described in RFC2783 isn't supported on USB serial ports on =
FreeBSD 8.3 or 9.0

Note that the PPS API  *is* supported:
http://fxr.watson.org/fxr/source/sys/timepps.h?v=3DFREEBSD9
http://fxr.watson.org/fxr/source/kern/kern_ntptime.c?v=3DFREEBSD9

But that timepps.h is only included via uart/uart_bus
http://fxr.watson.org/fxr/source/dev/uart/uart_bus.h?v=3DFREEBSD9

Compare:
http://fxr.watson.org/fxr/source/dev/uart/uart_core.c?v=3DFREEBSD9
and
http://fxr.watson.org/fxr/source/dev/sio/sio.c?v=3DFREEBSD9
and
http://fxr.watson.org/fxr/source/pc98/cbus/sio.c?v=3DFREEBSD9

to anything found in

http://fxr.watson.org/fxr/source/dev/usb/serial/?v=3DFREEBSD9