On 2012.05.26 11:05, Xiaofan Chen wrote:
> I am not so sure why there is the last warning about pipe stall.
>
> Claiming interface 0...
>
> Reading string descriptors:
>     String (0x01): "SEGGER"
>     String (0x02): "J-Link"
>     String (0x03): "xxxxxxxx"
> libusbx: warning [darwin_transfer_status] transfer error: pipe is stalled

I've seen that one too, and it occurs when trying to read a string 
descriptor that doesn't exist.

Basically, xusb will try to access string descriptor 0xEE to find out if 
the device is WCID and display the WCID data if that is the case (which 
can be done on any platform, not just Windows). It looks like trying to 
access 0xEE on Mac produces a pipe stall.

Regards,

/Pete

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