[LinuxPPS] Fwd: Attaching PPS to kernel

[Dave Hart]

On Fri, Apr 1, 2011 at 19:13 PM, Alvarez, Ralph
<ralph.alvarez at windriver.com> wrote:
> Hey Guys,
>
> Thanks for the assistance. I think I have my setup working now. Here's a summary of what I did:
>
> I probably should of mentioned that I'm using an older kernel (2.6.27) with the PPS patch applied. I tried NTP DEV version ntp-4.2.7p7xx but quickly reverted back to the most stable version (ntp-4.2.6p3) after Igor's comments that ntp-4.2.7p7xx wasn't stable with PPS.
>
> My NTP GPS/PPS setup is for an embedded system that has 8 networked hosts. One of the hosts acts as the NTP server while the others act as clients. Here's what I did to get things going:
>
> 1. Applied PPS patch (ntp-pps-2.6.27-rc3-bis-diff) to 2.6.27 kernel.
> 2. Built latest stable NTP (ntp-4.2.6p3) as follows:
>     a. ./configure --without-ntpsnmpd --disable-all-clocks --disable-parse-clocks --enable-ATOM --enable-NMEA --enable-LOCAL-CLOCK
>     b. Modified config.h.in to include these macros: HAVE_PPSAPI, HAVE_TIMEPPS_Hand CLOCK_ATOM.
>     c. Copied over timepps.h file to ntp/include folder (from pps-tools tarball).

Please re-read this excerpt of Igor's email:

On Fri, Apr 1, 2011 at 08:27 UTC, Igor Plyatov <plyatov at gmail.com> wrote:
> Hello!
>
> For the NMEA reference clock driver with PPS support, you need:
>
> 0) Linux kernel with PPS support enabled. I use Linux-2.6.36.
>
> 1) timepps.h file from pps-tools installed into /usr/include/
>
> 2) right NTP version compiled AFTER timepps.h installation. I use
> ntp-4.2.6p3, because ntp-4.2.4p7 does not work correctly with PPS.

Note he reports 4.2._4_p7 does not work correctly with PPS.  Not 4.2._7_.

Further note he empasizes rebuilding NTP after installing timepps.h.
This is so configure can detect it and you will not need to hack on
config.h.in afterward.

Good luck,
Dave Hart