You definitely need a supply that can generate enough current to have a decent ramp-up of 5V or the PMIC gets angry. But, there's also the issue of u-boot stopping if it sees a "phantom character" from the UART. So, if you need high reliability start-up you should rebuild u-boot for "keyed entry" as well.
-Ron On Tuesday, November 10, 2015 at 1:29:40 PM UTC-6, Fohnbit wrote: > > I forgot: > > I power up the power supply ... So not only connected the BBB on the > Running power supply. > > Trank you > > Am Dienstag, 10. November 2015 18:58:40 UTC+1 schrieb Wulf Man: > > rise time spec > > > > 1000ms setup 50ms rise time > > > > maybe gerald can give his thumbs up on that spec > > > > > > > > seems fast enough can you put a scope on it to be sure ? > > > > maybe the power supply is out of spec some of the time > > > > > > > > i have been using a cheap 5 dollar chinese supply for 2 years with > > no issues > > > > > > > > On 11/10/2015 10:30 AM, Fohnbit wrote: > > > > > > > > > > Hello, > > > > > > > > I use this: > > > > http://www.meanwell.com/webapp/product/search.aspx?prod=dr-15 > > > > > > > > DR-15-5 > > > > > > > > Am Montag, 9. November 2015 16:23:14 UTC+1 schrieb Wulf Man: > > > > > > > > > > As posted here a few times. > > > > If your power supply does not have a fast enough rise time > > getting up to voltage > > > > your BBB will not boot reliable. > > > > You have not said what specs your power supply is or where > > you got it from. > > > > > > > > > > > > > > > > On 11/9/2015 8:02 AM, Fohnbit wrote: > > > > > > > > > > Hello! > > > > > > > > Sometimes my BBB Rev C dont boot, when I connect the 5V. > > > > The Power LED is on but the 4 USR LED are off. > > > > > > > > This happen not really often ... So I have no debug > > information. > > > > > > > > But maybe someone has the same problem and know where > > the problem is? > > > > > > > > Thank you! > > > > > > -- > > > > 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/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]. > > > > 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]. For more options, visit https://groups.google.com/d/optout.
