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-EOVERFLOW (*)          The amount of data returned by the endpoint was
                        greater than either the max packet size of the
                        endpoint or the remaining buffer size.
                        "Babble".

Maybe you can have a look at the request you're allocating and sending
to the udc driver and check their size (should be <= at the endpoint
maxpacket size). You can also look at the usb endpoint descriptor you're
sending to the host and check that the value is fine. [ fwiw, ep[1-4]
hardware maxpacket size is 64 or 128 and the udc is configured to use
it but one can configure it through the ops->ep_enable stuff ]


Regards,
Arnaud