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Re: [gpsd-dev] GPSd on FreeBSD

From: Dustin Marquess
Subject: Re: [gpsd-dev] GPSd on FreeBSD
Date: Wed, 11 Sep 2019 00:12:04 -0500

I think he means "options PPS_SYNC", which is required in order to use
the in-kernel PPS disciplining.  Eg, it's like the "flag3" flag in
ntpd.  It's not required for PPS itself, only if you want the kernel
to discipline it itself.  I'm not sure why FreeBSD doesn't ship with
it enabled by default.


On Tue, Sep 10, 2019 at 10:31 PM O'Connor, Daniel <address@hidden> wrote:
> > On 11 Sep 2019, at 12:36, Hal Murray <address@hidden> wrote:
> > I haven't been carefully following this discussion.
> >
> > The stock FreeBSD kernel doesn't include PPS support.
> Why do you say that?
> > It's in the header files, but the option isn't enabled in the GENERIC kernel
> > that they ship for amd64 (aka x86_64) or the BEAGLEBONE or GENERIC for arm.
> Which option do you mean?
> My BBB is running the GENERIC kernel configuration, I have a device tree 
> overlay to get the dtmpps driver to attach and a patch to fix a problem with 
> the PPS timehands capture (which is now committed).
> I checked the source and the header plus parallel port implementation was 
> committed over 20 years ago, the serial capture was over 15 years ago and the 
> dmtpps AM335x timer capture code was added over 4 years ago.
> So far as I can see none of them required anything but a normal GENERIC 
> kernel.
> --
> Daniel O'Connor
> "The nice thing about standards is that there
> are so many of them to choose from."
>  -- Andrew Tanenbaum

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