On Mon, Nov 9, 2015 at 3:24 PM, William Hermans <[email protected]> wrote: >> Powered by "usb" with a "usb" dongled plugged = no power left for the >> cpu... >> >> Regards, > > > I have found that you *can* power by USB and use ethernet, but that is it. > So when we tried powering by USB, and use ethernet + CAN . . . the board > sometimes works, the board sometimes does not work. The take away from this > is that if you power by USB, you can maybe power one peripheral / IO > interface, but when trying to power more than one peripheral / IO interface. > You should use the barrel jack, with a 1-2A *good* power supply.
It also depends on the usb host/hub, on power up we get 100mA, and in u-boot we request "1.3A" over usb... If we actually get that "1.3A" we can do a lot, but most often then not we only get 500mA's.. I don't have the exact numbers at my desk, but i thinking a booting v3.8.x needs a peak around 350mA's for the core & mmc.. Regards, -- Robert Nelson https://rcn-ee.com/ -- 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.
