It turned out that ntpd is depreciated in ubuntu 18.04;
the default tool that needs to be disabled is timesyncd
sudo timedatectl set-ntp no
enabling ntp autostart
systemctl enable ntp
enabling ptp autostart [server side] where pps gps &ntp server are presented
sudo su
cat <<EOT >> /lib/systemd/system/ptp4l.service
[Unit]
Description=linuxptp server side autostart
[Service]
ExecStart=/usr/sbin/ptp4l -i eth0 -m -H
[Install]
WantedBy=multi-user.target
EOT
systemctl ptp4l enable
adding phc2sys autostart
cat <<EOT >> /lib/systemd/system/phc2sys.service
[Unit]
Description= phc2sys synchronization autostart
[Service]
ExecStart=/usr/local/sbin/phc2sys -m -s CLOCK_REALTIME -c eth0 -w
[Install]
WantedBy=multi-user.target
EOT
systemctl enable phc2sys
for auto-boot baudrate set
/etc/udev/rules.d/99-gps…
KERNEL=="ttyTHS0", SYMLINK+="gps0" , RUN+="/bin/stty -F /dev/ttyTHS0 38400"
KERNEL=="pps0", MODE="0660", SYMLINK+="gpspps0",TAG="systemd"
sudo su
echo "stty -F /dev/ttyTHS0 38400" >> /etc/rc.local
sudo su
cat <<EOT >> /lib/systemd/system/stty.service
[Unit]
Description=stty baudrate autostart
[Service]
ExecStart=/bin/stty -F -f /dev/ttyTHS0 38400
[Install]
WantedBy=multi-user.target
EOT
systemctl enable stty
by some reason the method above also fails autostaring; it works with manually startig the service
systemctl start stty
cat /etc/rc.local
( /bin/stty -F /dev/ttyTHS0 38400 )&
exit 0
the above neither seem to work also; therefore I had to install
sudo apt install setserial
sudo setserial /dev/ttyTHS0 baud_base 38400
^^this baudrate also doesn't seem to work
which of the services above do the routine of synchronizing system_clocks to /dev/rtc? is it something done by ntp? by linuxptp? both? neither of the two? does it require a separate process ?
is the default stock kernel compilled " compiled with the ‘11 minute mode’ option ? Ubuntu Manpage: hwclock - read or set the hardware clock (RTC)