[coreboot] EHCI Debug Gadget

[Kyösti Mälkki]

On 17.10.2013 17:45, John Lewis wrote:
> Hey Guys,
>
> I'm trying to setup a Beaglebone Black as the subject. I've followed the
> instructions and I get lots of this when I try to make it do it's thang:
>
> [ 3142.831914] CAUTION: musb: Babble Interrupt Occurred
> [ 3143.107609]  gadget: setup: failure req 9 v 1
> [ 3143.289034] CAUTION: musb: Babble Interrupt Occurred
> [ 3143.289088]  gadget: disconnected
> [ 3143.564615]  gadget: setup: failure req 9 v 1
> [ 3143.746013] CAUTION: musb: Babble Interrupt Occurred
> [ 3143.746058]  gadget: disconnected
> [ 3144.021599]  gadget: setup: failure req 9 v 1
> [ 3144.264994] CAUTION: musb: Babble Interrupt Occurred
> [ 3144.265038]  gadget: disconnected
> [ 3144.540802]  gadget: setup: failure req 9 v 1
> [ 3144.722247] CAUTION: musb: Babble Interrupt Occurred
> [ 3144.722304]  gadget: disconnected
> [ 3144.997944]  gadget: setup: failure req 9 v 1
> [ 3145.179357] CAUTION: musb: Babble Interrupt Occurred
> [ 3145.179415]  gadget: disconnected
>
> Any pointers? Web search comes up fruitless except for references to the
> kernel source code which I don't understand. ;)
>
> Thanks,
>
> John.
>

Hi John

Apply the patches and follow the instructions here for BeagleBone Black 
kernel:
    http://www.coreboot.org/EHCI_Gadget_Debug

In coreboot menuconfig, the selection of usbdebug dongle 'BeagleBone' is 
only for 'BeagleBone', not 'BeagleBone Black'. I better add option
for 'BeagleBone Black' to avoid the confusion. Select 'Net20DC 
compatible' for now.

Also in coreboot menuconfig, under 'Debugging', enable verbose usbdebug 
messaging. Of course you will need another working console to receive 
those messages, CBMEM console will do if your target system is able to 
reach OS.


Regards,
  Kyösti