[ntp:questions] Timing issue with Linux and kernel PPS?

David Taylor david-taylor at blueyonder.co.uk.invalid
Wed Nov 21 17:55:14 UTC 2012

On 20/11/2012 01:55, james machado wrote:
> David,
> running RPi with GPS+PPS here.
> I compiled my own kernel and the one major gotcha I had was an RTFM
> issue.  The kernel used on the RPi is not the compressed vmlinuz
> kernel used on PC's.  I recompiled my kernel 10 times or more before I
> went back scouring the 'net to find out the kernel in use was the
> kernel.img file.  Reason I say this is the first time I thought I had
> this working I was seeing kernel generated PPS signals and not GPS
> generated PPS signals.  Life got much easier when I figured that out
> :)
> I did contribute to the thread listed at the RPi forums but need to go
> back and add what got it working for me.  I also moved to a more
> current kernel.  I compiled a bunch of extra stuff in there as I want
> to play with the networking stuff too so my kernel is not a small one.
> uname -a
> Linux pisces 3.6.1+ #1 Fri Nov 2 02:10:35 PDT 2012 armv6l GNU/Linux
> James


Many thanks for that information.  Lots of good stuff!  Perhaps some day 
in the future I'll be recompiling the kernel (I recall that as being 
long process), but for now I'll just try to remember to reboot after 
Web: http://www.satsignal.eu

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