diff options
| author | Eric S. Raymond <esr@thyrsus.com> | 2016-05-07 08:14:08 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2016-05-07 08:33:49 -0400 |
| commit | 731438035a1a7c64820857f44a00807df3e9e437 (patch) | |
| tree | b8294fa778ba517ed713c785daff037c4cc805cc /www | |
| parent | 774f18e9e27a5934fd0e3e514ea47de88ca9b5ba (diff) | |
| download | gpsd-731438035a1a7c64820857f44a00807df3e9e437.tar.gz | |
Implement 'timeservice' build option. Document it in the Time Sevice HOWTO.
Diffstat (limited to 'www')
| -rw-r--r-- | www/gpsd-time-service-howto.txt | 28 |
1 files changed, 22 insertions, 6 deletions
diff --git a/www/gpsd-time-service-howto.txt b/www/gpsd-time-service-howto.txt index ad4e4518..54fbe5ff 100644 --- a/www/gpsd-time-service-howto.txt +++ b/www/gpsd-time-service-howto.txt @@ -281,18 +281,32 @@ have serious problems. == Software Prerequisites == -gpsd includes support for interpreting 1PPS pulses that is mostly -autoconfiguring and requires no special setup. If you built GPSD from -sources, make sure the build is with pps=yes and ntpshm=yes (the -default). The command "gpsd -L" should indicate that -time-service features and PPS are enabled. - If your kernel provides the RFC 2783 KPPS (kernel PPS) API, gpsd will use that for extra accuracy. Many Linux distributions have a package called "pps-tools" that will install KPPS support and the timepps.h header file. We recommend you do that. If your kernel is built in the normal modular way, this package installation will suffice. +=== Building gpsd == + +A full gpsd build includes support for interpreting 1PPS pulses that is mostly +autoconfiguring and requires no special setup. + +You can build a version stripped to the mimimum configuration required +for time service like this: + +----------------------------------------------------------------------------- +scons timeservice=yes nmea0183=yes +----------------------------------------------------------------------------- + +You may substitute a different GPS (e.g. "ublox" or "sirf") + +Otherwise, make sure the build is with pps=yes and ntpshm=yes (the +default). The command "gpsd -L" should indicate that time-service +features and PPS are enabled. + +=== Kernel support === + If you are scratch-building a Linux kernel, the configuration must include either these two lines, or the same with "y" replaced by "m" to enable the drivers as modules: @@ -329,6 +343,8 @@ Other OSes have different ways to enable KPPS in their kernels. When we learn what those are, we'll document them or point at references. +=== Time service daemon === + You will need to have either ntpd or chrony installed. If you are running a Unix variant with a package system, the packages will probably be named 'ntpd' and either 'chrony' or 'chronyd'. |