NanoPi Neo running armbian debian with ntp serial uart GPS gpio PPS from u-blox NEO-6M (GY-NEO6MV2)

gistfile1.txt

Linux nanopineo 4.14.15-sunxi #28 SMP Mon Jan 29 07:24:48 CET 2018 armv7l GNU/Linux

Order "GY-NEO6MV2" GPS module from Aliexpress for $4

Add uart1 and pps-gpio fdt overlays, assign PPS pin
per https://docs.armbian.com/User-Guide_Allwinner_overlays/
Using a GPIO pin instead of a uart control pin because this
armbian kernel already has CONFIG_PPS_CLIENT_GPIO=m instead
of LDISC and not even sure it would work on a CTS pin anyway.

/boot/armbianEnv.txt
	overlays=usbhost1 usbhost2 uart1 pps-gpio
	param_pps_pin=PA6

Install gpsd (can be built as "timeservice" per "Building gpsd"
in howto, or just installed as package with defaults is fine too),
gpsd-clients, pps-tools

Read, understand and follow:
	http://catb.org/gpsd/gpsd-time-service-howto.html
	http://catb.org/gpsd/troubleshooting.html
(hints: delete /run/gpsd.sock between all runs/tests,
follow startup troubleshooting for systemd)

Set proper flags in /etc/default/gpsd
	START_DAEMON="true"
	USBAUTO="false"
	DEVICES="/dev/ttyS1 /dev/pps0"
	GPSD_OPTIONS="-n -F /run/gpsd.sock"

Beat systemd into actually starting it on boot
logs: journalctl -u <service-name> -b

Checking with gpsmon/cgps every step of the way....

Configure ntpd.conf

ntpq -p