walduino/Odroid C1 NTP Stratum 0 PPS GPS Clock

## etc-default-gpsd
# Default settings for the gpsd init script and the hotplug wrapper.

# Start the gpsd daemon automatically at boot time
START_DAEMON="true"

# Use USB hotplugging to add new USB devices automatically to the daemon
USBAUTO="true"

# Devices gpsd should collect to at boot time.
# They need to be read/writeable, either by user gpsd or the group dialout.
DEVICES="/dev/ttyS2"

# Other options you want to pass to gpsd
GPSD_OPTIONS="-n"

## etc-ntp.conf

# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable

# Specify one or more NTP servers.

# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
# more information.
server ntp.scarlet.be
server ptbtime1.ptb.de
ntp1.teambelgium.net
server 3.be.pool.ntp.org
server 3.europe.pool.ntp.org
server 2.europe.pool.ntp.org
pool 0.ubuntu.pool.ntp.org iburst
pool 1.ubuntu.pool.ntp.org iburst
pool 2.ubuntu.pool.ntp.org iburst
pool 3.ubuntu.pool.ntp.org iburst


# Use Ubuntu's ntp server as a fallback.
pool ntp.ubuntu.com

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Needed for adding pool entries
restrict source notrap nomodify noquery

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust


# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient

#Changes recquired to use pps synchonisation as explained in documentation:
#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918

# GPS Serial data reference (NTP0)
#server 127.127.28.0
#fudge 127.127.28.0  refid GPS

# Kernel-mode PPS ref-clock for the precise seconds
#server 127.127.22.0 minpoll 1 maxpoll 4 prefer
#fudge 127.127.22.0  flag1 1  flag3 1 refid PPS

# coarse time ref-clock
server 127.127.28.0 minpoll 4 maxpoll 4  prefer
fudge 127.127.28.0 time1 +0.435 flag1 1 refid GPSD stratum 5

# PPS fine time ref
server 127.127.22.0 minpoll 1  maxpoll 4 prefer
fudge 127.127.22.0 refid PPS


## Odroid C1 NTP Stratum 0 PPS GPS Clock
sudo -s
apt-get install device-tree-compiler pps-tools gpsd ntp
fdtput -c /media/boot/meson8b_odroidc.dtb /pps
fdtput -t s /media/boot/meson8b_odroidc.dtb /pps compatible "pps-gpio"
fdtput -t s /media/boot/meson8b_odroidc.dtb /pps gpios "GPIOY_3"

GPS PPS pin attached to GPIOY_3
http://odroid.com/dokuwiki/doku.php?id=en:c1_gpio_pps

test commands
ppstest /dev/pps0
apt-get install gpsd-clients ==> cgps
	# Default settings for the gpsd init script and the hotplug wrapper.

	# Start the gpsd daemon automatically at boot time
	START_DAEMON="true"

	# Use USB hotplugging to add new USB devices automatically to the daemon
	USBAUTO="true"

	# Devices gpsd should collect to at boot time.
	# They need to be read/writeable, either by user gpsd or the group dialout.
	DEVICES="/dev/ttyS2"

	# Other options you want to pass to gpsd
	GPSD_OPTIONS="-n"

	# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help

	driftfile /var/lib/ntp/ntp.drift

	# Enable this if you want statistics to be logged.
	#statsdir /var/log/ntpstats/

	statistics loopstats peerstats clockstats
	filegen loopstats file loopstats type day enable
	filegen peerstats file peerstats type day enable
	filegen clockstats file clockstats type day enable

	# Specify one or more NTP servers.

	# Use servers from the NTP Pool Project. Approved by Ubuntu Technical Board
	# on 2011-02-08 (LP: #104525). See http://www.pool.ntp.org/join.html for
	# more information.
	server ntp.scarlet.be
	server ptbtime1.ptb.de
	ntp1.teambelgium.net
	server 3.be.pool.ntp.org
	server 3.europe.pool.ntp.org
	server 2.europe.pool.ntp.org
	pool 0.ubuntu.pool.ntp.org iburst
	pool 1.ubuntu.pool.ntp.org iburst
	pool 2.ubuntu.pool.ntp.org iburst
	pool 3.ubuntu.pool.ntp.org iburst


	# Use Ubuntu's ntp server as a fallback.
	pool ntp.ubuntu.com

	# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
	# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
	# might also be helpful.
	#
	# Note that "restrict" applies to both servers and clients, so a configuration
	# that might be intended to block requests from certain clients could also end
	# up blocking replies from your own upstream servers.

	# By default, exchange time with everybody, but don't allow configuration.
	restrict -4 default kod notrap nomodify nopeer noquery limited
	restrict -6 default kod notrap nomodify nopeer noquery limited

	# Local users may interrogate the ntp server more closely.
	restrict 127.0.0.1
	restrict ::1

	# Needed for adding pool entries
	restrict source notrap nomodify noquery

	# Clients from this (example!) subnet have unlimited access, but only if
	# cryptographically authenticated.
	#restrict 192.168.123.0 mask 255.255.255.0 notrust


	# If you want to provide time to your local subnet, change the next line.
	# (Again, the address is an example only.)
	#broadcast 192.168.123.255

	# If you want to listen to time broadcasts on your local subnet, de-comment the
	# next lines. Please do this only if you trust everybody on the network!
	#disable auth
	#broadcastclient

	#Changes recquired to use pps synchonisation as explained in documentation:
	#http://www.ntp.org/ntpfaq/NTP-s-config-adv.htm#AEN3918

	# GPS Serial data reference (NTP0)
	#server 127.127.28.0
	#fudge 127.127.28.0 refid GPS

	# Kernel-mode PPS ref-clock for the precise seconds
	#server 127.127.22.0 minpoll 1 maxpoll 4 prefer
	#fudge 127.127.22.0 flag1 1 flag3 1 refid PPS

	# coarse time ref-clock
	server 127.127.28.0 minpoll 4 maxpoll 4 prefer
	fudge 127.127.28.0 time1 +0.435 flag1 1 refid GPSD stratum 5

	# PPS fine time ref
	server 127.127.22.0 minpoll 1 maxpoll 4 prefer
	fudge 127.127.22.0 refid PPS
	sudo -s
	apt-get install device-tree-compiler pps-tools gpsd ntp
	fdtput -c /media/boot/meson8b_odroidc.dtb /pps
	fdtput -t s /media/boot/meson8b_odroidc.dtb /pps compatible "pps-gpio"
	fdtput -t s /media/boot/meson8b_odroidc.dtb /pps gpios "GPIOY_3"

	GPS PPS pin attached to GPIOY_3
	http://odroid.com/dokuwiki/doku.php?id=en:c1_gpio_pps

	test commands
	ppstest /dev/pps0
	apt-get install gpsd-clients ==> cgps