usb0_vbus on the processor is an analog input to a comparator. page 80 of the processor ref manual says - USB0_VBUS (7) Supply voltage for USB VBUS comparator input i do not see it saying supplies any voltage to the circuit anywhere in the PDF. I can see the software causing the issue if there is some kind of noise in the line. maybe instead of a hard ground which would cause headaches if one was to plug a usb power connector to the BBB a pulldown of 10k on the line to keep it low. One would need to test this idea out.
Gerald might have a comment ? On 7/20/2015 12:41 AM, Maxim Podbereznyy wrote: > As far as I remember how the Vbus issue was described in details, hope > I'm not mistaken: > Vbus connects to both CPU and PMIC. CPU has a charge-pump circuit to > detect OTG devices (inject some power and track USB signals for > incoming events) and it injects 5V periodically into Vbus line. > Sometimes PMIC detects this 5V on the Vbus input as a good voltage and > turns inner power switch to Vbus where in fact no 5V with sufficient > current. Next power failure and immediate reboot occur > > 2015-07-20 3:08 GMT+03:00 john dough <software...@live.com > <mailto:software...@live.com>>: > > > > Sent from my Windows Phone > ------------------------------------------------------------------------ > From: William Hermans <mailto:yyrk...@gmail.com> > Sent: 7/19/2015 11:11 AM > To: beagleboard@googlegroups.com <mailto:beagleboard@googlegroups.com> > Subject: Re: [beagleboard] BBB intermittently rebooting. > > Graham, thats where you're wrong. I've been using all those > testing kernels EXACT SAME KERNELS you've been having troubles > with. Except, I'm not having troubles with them. Why ? Becasue I'm > powering via USB. > > So if you REALLY want to prove the problem this won't work for > *you* try powering via USB . . . > > On Sun, Jul 19, 2015 at 7:55 AM, Graham <gra...@flex-radio.com > <mailto:gra...@flex-radio.com>> wrote: > > Eric: > You never said what you were trying to do with the BBB, and > why you need Debian 8.1/kernel 4.x.x. > As you have seen, it is temporarily broken, but is being > worked on. This is a "test" release, and not recommended for > active use, unless you like adventures, like you are having. > > If you need the capemanager, consider Debian 7.8/kernel 3.8 > > If you don't need the capemanager, but need some other benefit > of Debian 8, then use Debian 8.x and kernel 3.14. > > Both of these options are solid, do not reboot by themselves, > and don't care whether it is powered from the 5V barrel > connector or USB. > --- Graham > > == > -- > For more options, visit http://beagleboard.org/discuss > <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 beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout > <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 beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > 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 beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout. > > > > > -- > LinkedIn - http://www.linkedin.com/in/maximpodbereznyy > Company - http://www.linkedin.com/company/mentorel > Facebook - https://www.facebook.com/mentorel.company > -- > 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 beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
