I have a GPS receiver with PPS connected to an embedded Linux system. GPSD feeds Chrony time updates from the GPS receiver over the Chrony socket.
The system clock is behind by a few months, and Chrony does not want to update the clock to the time reported by GPSD. I have read the FAQ and a few threads on the same topic but the solutions presented don’t work for me. I have tried setting maxdistance to an absurdly high number, and allowing makestep 1 -1. The “chronyc sources” command suggests that Chrony thinks that the GPS is in error. There is no console message that says that Chrony is attempting to adjust the clock. Can I force Chrony to accept the time from the GPS? Thanks, Ryan $ chronyc sources 210 Number of sources = 3 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== #x GPS 0 4 377 11 -2002h[ -2002h] +/- 100ms #x PPS 0 4 377 10 -2002h[ -2002h] +/- 2919ns ^? asdf.xyz 0 9 0 - +0ns[ +0ns] +/- 0ns $ chronyc tracking Reference ID : 00000000 () Stratum : 0 Ref time (UTC) : Thu Jan 01 00:00:00 1970 System time : 0.000000041 seconds fast of NTP time Last offset : +0.000000000 seconds RMS offset : 0.000000000 seconds Frequency : 404.716 ppm fast Residual freq : +0.000 ppm Skew : 0.000 ppm Root delay : 1.000000000 seconds Root dispersion : 1.000000000 seconds Update interval : 0.0 seconds Leap status : Not synchronised $ cat /etc/chrony/chrony.conf server asdf.xyz iburst prefer # This directive specify the file into which chronyd will store the rate # information driftfile /var/lib/chrony/chrony.drift # Log files location logdir /var/log/chrony # Stop bad estimates upsetting machine clock #maxupdateskew 100.0 # This directive enables kernel synchronisation (every 11 minutes) of the # real-time clock rtcsync # Step the system clock instead of slewing it if the adjustment is larger than # one second, but only in the first three clock updates makestep 1 -1 # maxdistance 100000000 refclock SOCK /run/chrony.ttyCOM2.sock refid GPS precision 1e-1 offset 0.9999 refclock SOCK /run/chrony.ppsCOM2.sock refid PPS precision 1e-7