Hi, I am using BBB with a GPS to get system time into NTP using the NMEA string. I've done this a few times before. I have no network connection for ntpd. (It works if I have a network connection but NOT with /dev/gps0 as the only time server)
The problem: I map /dev/ttyO1 to /dev/gps0 as a rule in /etc/udev/rules.d systemd boots as usual and when ntpdate.service executes /dev/gps0 still isn't ready so NTPd fails and hangs since it can't find a time server. I end up manually having to kill ntpd and restart the ntpdate service again I have managed to force it to work by disabling ntpdate.service and ntpd.service in systemd and instead use CRON to call ntpd 30 seconds after boot with a 'sleep 30'. A rubbish solution I know! But it does highlight the fact that NTPd should not run before /dev/gps0 exists if NTP is to work properly. My questions - 1. How do I get ntpdate.service to only run when /dev/gps0 already exists? i.e. wait until /dev/gps0 is streaming NMEA data. I have tried a number of 'Before' and 'After' commands in /lib/system/systemd/ntpdate.service with no apparent change. 2. Why is the creation of /dev/gps0 taking so long? udev seems to be configuring this rule very slowly. It's only a serial port mapping so why take 10's of seconds? Any help greatly appreciated! Neil -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
