On Wed, 20 Mar 2013, victor yeo wrote:

> Thanks, i add processing the pending data from FIFO after queue was
> called. The UDC driver can process the SCSI INQUIRY command and SCSI
> READ FORMAT CAPACITIES command now.
> 
> In the processing of SCSI READ FORMAT CAPACITIES command, there is
> attention condition. Then the bulk transfer stops completely and
> control transfer is repeated.

What control transfer?

> How can i solve it?

First you have to figure out why it isn't working.  What does the 
debugging information show?

Alan Stern

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