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authorJohn Klug <john.klug@multitech.com>2017-01-13 19:24:21 -0600
committerJohn Klug <john.klug@multitech.com>2017-01-13 19:24:21 -0600
commita439b62e1e91fbb6822e0e4a5b3714bd2e28b969 (patch)
treeadf232b8ae0025476df6c34e7839fae528ebc04c /recipes-support/ntp
parent823edc2d6be48e9dc2dffda2f44c8dea5b7fc1e6 (diff)
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Enhance the documentation for /etc/default/ntpd
Diffstat (limited to 'recipes-support/ntp')
-rw-r--r--recipes-support/ntp/files/ntpd-default17
1 files changed, 11 insertions, 6 deletions
diff --git a/recipes-support/ntp/files/ntpd-default b/recipes-support/ntp/files/ntpd-default
index 85b8041..4811f46 100644
--- a/recipes-support/ntp/files/ntpd-default
+++ b/recipes-support/ntp/files/ntpd-default
@@ -5,22 +5,27 @@
# This is needed if we are not using NTP servers.
# NTP will not work with the GPS if the GPS is not
# locked before starting.
+# See /etc/default/gpsd for the states required.
GPSD_REQUIRED=1
-# Number of seconds to wait before checking if
-# the GPS has a lock.
+# Number of seconds between testing for a GPS
+# lock prior to calling ntpd.
GPSD_WAIT_TIME=120
# Since the HW Clock could be off by a second or
# so, our GPS might get marked as a false ticker
# if we do not set the system clock to the GPS
# first. The current correct way to do this
-# according to the GPS doc is ntpd -gq
+# according to the ntp doc is ntpd -gq -c conffile
# which must be done before ntpd is started.
+# conffile should exclude the local clock, so it is
+# ignored while doing the initial sync.
# ntpd -gq apparently does not work with the GPS
-# when tested with the clock one day off and no
-# ntpd.
+# when tested with the clock more than one day off
+# and no ntpd. The gps shared memory is never polled.
+#
# If there is a uBlox GPS present, the time is
-# read from the GPS to initialize the system time.
+# read from the GPS to initialize the system time
+# before NTP is started.
SET_SYSTEM_CLOCK=1