Mike: Thanks for the comments.
Were you using the USB0 connector on the board (which is hardwired to P1-pin7), or was it an independent off board connector? --- Graham On Tue, Dec 12, 2017 at 1:19 AM, <[email protected]> wrote: > Hello Graham, > > thanks for your feedback. > > I tried running PocketBeagle from Vin/pin1 and it worked smoothly here for > more than 13 hours. It was powered via 5V that came from a USB connector. > > But I was running a bare metal application with no Linux involved. So may > be there is a bug rather in the Linux system you are using than in the > hardware? > > I remember the PMIC of the BeagleBone could be accessed from software, > watchdog with some illegal parameters would be a candidate too (OK, > watchdog would not explain why the power pin has an influence...). > > With kind regards > > Mike > > > > On Saturday, December 9, 2017 at 6:11:39 AM UTC+1, Graham wrote: >> >> I have been unable to get a PocketBeagle to run for more than about 12 >> hours without rebooting when powered from Vin (P1-pin1), using a trusted >> power supply. >> It usually reboots itself successfully, so in order to see it, run some >> commands to turn off the blinking blue lights. If they come back on by >> themselves, it has rebooted. >> Or you can read the system logs. >> >> It works fine when powered from Vi (P1-pin7) which is the same as the >> Vusb +5 Volt input/output. >> It works fine when Vi and Vin are paralleled, but I am uncomfortable >> paralleling power supplies, unless someone who really understands them says >> it is OK. >> >> The docs indicate that Vin (P1-pin1) should be the primary power input >> for power inputs other than battery or USB, and this input should have the >> highest current handling capability of the three. >> >> So far, I find that Vin is approximately worthless. >> Your mileage may vary. >> So far, no reaction or comment from Jason or Robert. >> >> If you can, or can not, duplicate my observations, please comment. >> >> As far as a replacement for SYS_RESETn, I don't think that the external >> 3V3 power appears until the system has booted, so you could use this >> Voltage to gate things that might upset the boot process, or break things >> prior to the CPU booting. >> At least that is how it worked on the BBB, so I assume the same on the >> PocketBone. >> >> --- Graham >> >> == >> >> On Friday, December 8, 2017 at 3:16:45 AM UTC-6, [email protected] >> wrote: >>> >>> Nobody an idea? While searching through the board here I find two >>> different opinions about VDD/where to apply external power to, so some >>> clarification would be really nice... >>> >>> >>> >>> On Saturday, December 2, 2017 at 6:22:47 PM UTC+1, [email protected] >>> wrote: >>>> >>>> Can somebody verify where the following pins/signals can be found at >>>> the PocketBeagle (comparing to BeagleBone Black): >>>> >>>> - VDD (to supply externel power apart from USB) >>>> - SYS_RESETn (signalling SiP is in reset state and no inputs are >>>> allowed to be pulled to LOW or HIGH) >>>> >>>> ? >>>> >>>> Thanks! >>>> >>>> >>>> -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/beagleboard/4mHqSR0zOGU/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/e79f8f6c-d001-4662-9f45-d8291a55fac3%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/e79f8f6c-d001-4662-9f45-d8291a55fac3%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/CAC_N71qGtVx%3DLyiSBKd8Rvb-Osa_dC6umstLow0%2BvbardOqZbg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
