Hi,
While we developed a control IC for USB mass storage device (BULK only), we
found that Mac OS 10.1.3 behaves strangely when handling STALL condition.
In case our device returns STALL for a BULK pipe (at CSW stage), Mac OS tries
to clear it by a Clear_Feature command. However, Mac OS 10.1.3 issues this
command to control pipe (endpoint 0), not the BULK pipe which is really
stalled. Then Mac OS retrieves status of the BULK pipe by a Get_Status
command and finds the STALL condition is not cleared as expected. So Mac OS
tries Clear_Feature (to the wrong endpoint again) and Get_Status again and
again, and never escapes from this endless loop.
I have stored the phenomenon by Catalyst's USB protocol analyzer. I am afraid
to attach the file will violate rules of this group, so I did not attach it.
Hope somebody can help me.
Regards
Roger Lu
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