Installing Stratum II NTP server on RaspberryPi using SiRF STAR III gps

Links

• http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
• https://www.raspberrypi.org/forums/viewtopic.php?t=191050

Raspbian installation

root@ntpi:/home/pi# systemctl start ssh

root@ntpi:/home/pi# systemctl enable ssh

pi@ntpi:~ $ grep pps /boot/config.txt 
dtoverlay=pps-gpio,gpiopin=18

pi@ntpi:~ $ sudo apt-get install pps-tools

# reboot, after it:

pi@ntpi:~ $ dmesg | grep pps
[   30.331047] pps_core: LinuxPPS API ver. 1 registered
[   30.331066] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[   30.352868] pps pps0: new PPS source pps.-1
[   30.352966] pps pps0: Registered IRQ 178 as PPS source