Re: gadgetfs: host side enumeration issues

[David Brownell <david-b@xxxxxxxxxxx>]

On Saturday 19 January 2008, Anshuman Saxena wrote:
> As you can see, it does bind to the at91_udc but there seems to be
> some problem with the user space program usb.c. Wondering if anyone
> came across this issue?  

I finally made time to investigate it, and saw this too.

The problem seems to be that userspace didn't understand the
data it was getting.  On slightly closer examination, the
cause became apparent:  I was using an old binary.

The struct passed into the kernel had two fields swapped in
order to provide the same ABI on 32-bit and 64-bit kernels.
(This is OK for such "EXPERIMENTAL" features, for which a
stable API isn't yet provided.)

The fix was to recompile, using the updated interface to
gadgetfs.  Then it worked fine.

- Dave

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