Re: [libvirt] Constantly changing USB product ID
Hello Jaap,
On Thursday 29 March 2012 01:51:21 Jaap Winius wrote:
Okay, thanks; so now I know that it's not just badly designed
hardware
that may do this. My device, however, is not a smart-phone or some
other consumer device: it's a scanner with a rotating drum on which to
mount flexible, reusable photographic plates from an X-ray machine.
It's rather expensive too. Of course, it only works with a Windows
application. Can you imagine a legitimate reason why a machine like
this might keep flipping its product ID?
I know of some USB devices which use this trick to load there firmware:
Initially the start without a firmware (so the manufacurer doesn't need to
put a flash chip on the device) an USB-ID A. Windows detects the device using
the ID and uploads the firmware to the device, which then soft-resets itself
and re-appears with USB-ID B.
Sincerely
Philipp
--
Philipp Hahn Open Source Software Engineer hahn(a)univention.de
Univention GmbH be open. fon: +49 421 22 232- 0
Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99
http://www.univention.de/
Attachments:
- signature.asc (application/pgp-signature — 197 bytes)