On Mon, Apr 4, 2016 at 11:53 AM, Martin Wiingaard <[email protected]> wrote:
> Hey There, > > I'm running BeagleBone Black Rev C. > I have developed my own custom cape, it is using the following IO-pins: > > BBB-header no > > BBB GPIO no > > P9_42 > > 7 > > P9_18 > > 4 > > P9_17 > > 5 > > P9_15 > > 48 > > P9_28 > > 113 > > P9_23 > > 49 > > P9_31 > > 110 > > P9_12 > > 60 > > P9_29 > > 111 > > P9_27 > > 115 > > P9_25 > > 117 > > I have developed a device tree overlay, that's declaring all the pins as > GPIOs, and I have set all pins to output with value 0. Other than that am I > using the VDD_3V3 and VDD_5V. > > When I put the cape on, I get some error mesaages on dmesg: > > [ 159.482950] mmcblk0: error -110 sending status command, retrying > > [ 159.489379] mmcblk0: error -110 sending status command, aborting > > [ 159.495725] end_request: I/O error, dev mmcblk0, sector 497760 > > > At this point I can still type in some simple commands to the commandline > (such as ls and cd) but more demanding commands fails (such as top and > shutdown), it gives me an I/O error. > > > So it seems that the MMC-card for some reason is unreachable. The cape > doesn't seem to affect the supply voltage, is was measured on VDD_3V3 > (P9_3) to be 3,15V both before and after I put the cape on. > > > Does anybody have any clues, or any suggestions to how I could do further > debugging? > > > Thanks :) > > -- > 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. > Are you sure none of those pins are being used by the emmc? It sure sounds like they might be... Chris -- 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.
