On 28/10/2013, at 13:27, Bai Shi <baishi...@gmail.com> wrote:

> My usb device draws power from external power supply, only D+ and D- is 
> connected to BBB. It works 90% of time but when I mess around too much 
> (on/off too frequently maybe, not confirmed), it will reset the USB of BBB 
> and then it will behave very strangely. Every access to /sys/bus/usb take 
> more than 15 seconds and timeout eventually.
> 
> Hope my experience gives some hint...

Is the same external power supply connected to the Beagle Board?  

So, the ground shield of the USB cable is connect only on one side (the device) 
or is it completely  "floating"? 

Best regards 

Paulo Ferreira 

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