Re: USBSER.SYS: where to get a bug-free version?
From: Holi (holi_at_nospam.com)
Date: 08/30/04
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Date: Mon, 30 Aug 2004 09:40:06 +0200
First of all I'm not so sure if Windows supports composite devices at all - not
to support is one thing, but producing BSOD's because of not supporting is another.
DFU specs (chapt. 4.1.) say:
"During normal run-time operation, the device exposes its normal set of
descriptors. However, the
following additional descriptors are inserted within each run-time
configuration that supports DFU:
- A single DFU class interface descriptor
- A single functional descriptor
4.1.1 Run-Time Device and Configuration Descriptors
The run-time descriptor set exposes the device’s normal run-time device and
configuration descriptors.
The bNumInterfaces field of configuration descriptor of each configuration that
supports DFU is incremented by one to accommodate the addition of the run-time
DFU interface."
Our device was checked by a validator program on MAC OS and looks fine. Windows
ends up with a BSOD with this implementation of DFU specs. I think for DFU
support this IS a requirement.
What do you think?
Holi
Marc Reinig wrote:
> The USB spec has many features. Some are required and are labeled as such.
> Some are optional and are not labeled as required. Which of the required
> features do you feel have been either omitted or incorrectly implemented.
>
> Marc Reinig
> System Solutions
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