Ok, so how do you fix the problem ? manually bring the CANBUS interface up ? If that is te case, then you need to start your script later in the boot process. Using rc.d may do the trick, but in case you're already using rc.d, then you may need to setup a cron job to 30 seconds after boot, or something. This would need trial and error. In other words this strongly sounds like some kind of "race condition".
With systemd there is a way to test for prerequisite services, but I do not know systemd well enough to advise you there. On Tue, May 3, 2016 at 11:00 AM, Akash Gajeshwar <[email protected]> wrote: > I have script that runs at startup which initializes the CAN communication > on my BBB. Whenever I restart my BBB this script does work most of the > times, I would say 7 out of 10. > Once the CAN is up successfully it never stops in middle of working. Then > I generally use Candump to fetch all the values from CAN bus. > The only issue is, sometimes on reboot I get the error message saying > "Read: Network is Down". So I am wondering what is the possible issue from > BBB side. > > > On Tuesday, May 3, 2016 at 1:20:01 PM UTC-4, William Hermans wrote: >> >> *Can you please tell me how does sometimes the CAN network goes down on >>> rebooting the BBB?* >>> >> >> No, I can only guess because you're not giving enough information. But if >> I had to guess right now I'd say you're having a script / driver module >> race condition. But even that does not sound 100% right. >> >> You need to apply some troubleshooting for situation . . . >> >> On Tue, May 3, 2016 at 10:14 AM, Akash Gajeshwar <[email protected]> >> wrote: >> >>> Yes. I do have a script that runs at startup. >>> >>> Even if I try to run that script manually it shows the same error. >>> >>> Can you please tell me how does sometimes the CAN network goes down on >>> rebooting the BBB? >>> >>> On Tuesday, May 3, 2016 at 12:58:11 PM UTC-4, William Hermans wrote: >>>> >>>> Of course the can network goes down when you reboot the system, but you >>>> need to be more clear as to what your problem is. Do you have a script that >>>> runs on startup that is failing, or what ? >>>> >>>> On Tue, May 3, 2016 at 9:48 AM, Akash Gajeshwar <[email protected] >>>> > wrote: >>>> >>>>> Hello, >>>>> >>>>> I am using "Waveshare CAN Cape" for sending CAN messages from >>>>> Beaglebone Black. I communicate with Beaglebone using ethernet by making >>>>> SSH connection and I have latest Debian OS on BBB. >>>>> >>>>> Sometimes when I restart the Beaglebone it shows an error message >>>>> saying "Network is down". Because of this my whole CAN communication stops >>>>> to work. >>>>> >>>>> I am not sure why there is this inconsistency with BBB. Please let me >>>>> know if there is any possible solution for this. >>>>> >>>>> Thank you, >>>>> Akash G. >>>>> >>>>> -- >>>>> 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]. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/beagleboard/c8d019d5-7ec7-4b5d-93a2-4bf56af84d98%40googlegroups.com >>>>> <https://groups.google.com/d/msgid/beagleboard/c8d019d5-7ec7-4b5d-93a2-4bf56af84d98%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>> 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]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/beagleboard/31638628-584e-4c16-8a6e-dc18c361723e%40googlegroups.com >>> <https://groups.google.com/d/msgid/beagleboard/31638628-584e-4c16-8a6e-dc18c361723e%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > 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]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/1c30c10f-9326-47bf-a9a3-2a8d5ea1a074%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/1c30c10f-9326-47bf-a9a3-2a8d5ea1a074%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORo9FnLt-%2B9rStxp5CnnFGR843YvyOQ2cPQfP8fKpV0Lxw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
