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From: Burkard Meyendriesch <bm@malepartus.de>
To: Peter Jeremy <peter.jeremy@auss2.alcatel.com.au>
cc: freebsd-stable@FreeBSD.ORG, bm@malepartus.de
Subject: Re: kernel PPS line discipline for NTP 
In-reply-to: Your Message from Mon, 07 Sep 1998 08:37:52 +1000.
             <98Sep7.083737est.40333@border.alcanet.com.au> 
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1998-09-07 08:37:52 +1000
Peter Jeremy <peter.jeremy@auss2.alcatel.com.au> wrote:
>
> Burkard Meyendriesch <bm@malepartus.de> writes:
> >I'm trying to install a NTP pulse per second suport on my FreeBSD-2.2.7
> 
> >Can anybody of you give me a hint for installing a timestamp line
> >discipline on FreeBSD?
>
> [...]
> I have patched sio.c on 2.2.6 to support a PPS signal,whilst
> minimising the jitter within the sio interrupt handler and including a
> call to hardpps().  The changed in 2.2.7 are fairly minor, so the
> patch should apply fairly cleanly.  Let me know if you're interested.
> 
> I'm also looking at a solution to compensate for interrupt latencies,
> but that will require additional hardware and a bi-directional
> parallel port.
> 
> Peter
> --
Hello Peter,

thanks a lot for your description of the FreeBSD interrupt behavior and
the already installed code for TIOCTIMESTAMP.

Yes, I'm very interested in your sio.c patch for PPS support. Maybe
it might be of interest for the rest of the group too.

Burkard

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