[ntp:questions] linux PPS reference clocks

tom kayser forensic at milwpc.com
Thu Nov 2 08:11:32 UTC 2006

On Tuesday 31 October 2006 11:56, Wolfgang S. Rupprecht wrote:
> Can someone give me the back story of reference clocks on linux?  I
> notice that there are a set of patches to add PPS support to the
> kernel, but there apparently is no support in the stock kernel.  The
> PPS patches seem to have been around for quite a while, yet they still
> aren't included in the stock kernel.  Anyone know what gives?

The LinuxPPS patches are pretty good.  I haven't used the git repositories 
yet, so I'm still using the 2.6.17 patch.  I compiled a pristine kernel in 
FC5 after I patched it with the PPS patch.  I did the same thing with Debian 
Etch.  I used the official ntp sources, not the distro packages, as the 
prepacked ntp doesn't yet support NMEA.  But, with a Motorola Oncore you 
would probably alright.
> Now that my machines have all been "unified" and run fc6 from a
> hodgepodge of different BSD's, I'd like to see if I can start using my
> Moto Oncore again.  I'm a bit reluctant to muck up the automatic
> update machinery by installing a homegrown (home-patched ???) kernel.
> -wolfgang

I don't think FC will update the kernel if you aren't running a stock FC 
kernel.  So, everything else will update, but not the kernel if you compile 
from pristine sources


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