On Wednesday 27 May 2009, Aric D. Blumer wrote:
> I was finally able to take the time to try this out, and you are correct
> about the versioning. If I use 'USB_DEVICE(0x0525, 0xa4a2)' in
> cdc_subset.c, the proper driver is loaded, and it works.
Great, I'll send in the patch for this later tonight and give
you another Tested-by: credit. :)
> Below is the
> dmesg output. The fact that the zaurus driver is still being loaded is
> a bit strange to me, but perhaps that's expected.
Probably this bit in the ID table for it:
/* At least some of the newest PXA units have very different lies about
* their standards support: they claim to be cell phones offering
* direct access to their radios! (No, they don't conform to CDC MDLM.)
*/
{
USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MDLM,
USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &bogus_mdlm_info,
},
See the top of drivers/usb/gadget/f_subset.c where it explains that
it now sticks in some extra descriptors so that it can talk to a
commercial driver from MCCI ... Microsoft's RNDIS drivers are not
robust enough for many people, go figure!
So the remaining puzzle is: why was the "zaurus" driver rejecting
this? I'm guessing it's because the zaurus code is insisting on
CDC-conformant framing (append CRC to packet).
- Dave
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