On Tue, 12 Jun 2007, Balan, Vineeth (IE10) wrote:
> Hi Alan
>
> We are not still able to get the device to respond .The command
> sequence that we are using:
>
> 1. Read 10 - response is STALL.
> We then clear feature command. And a Bulk in to retrieve the CSW of
> failed Read 10.
> 2. Request Sense: 18 bytes of sense data and CSW. Sense data shows 06 -
> UNIT Attention condition.
> 3. Read 10 Stall again.
>
> How do we resolve this issue? We are using an OHCI controller and the
> device is USB 2.0 compatible. Is this a factor?
No.
> Should we give a specific amount of time between a UNIT ATTENTION
> condition and next Read 10. We have also noted that all medium access
> commands fail but others like Read Capacity, TUR, is successful.
It's very frustrating trying to give you advice, because you rarely
follow it. So here are my suggestions:
1. Plug your device into a standard Linux system and use your
bus analyzer or usbmon to see what commands and data get
sent. Then see how it differs from your system and try
changing your system to match what Linux does.
2. Use a different test device. Some work better than others.
In fact, I don't remember if you have ever said what sort of
device you are using for your tests.
Alan Stern
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