Hi. I've been playing with a Gumstix SBC that I recently acquired
(http://gumstix.com/). It is a tiny computer that runs a stripped-down
version of Linux, based on an Xscale PXA255 CPU. It is possible to use
the Linux USB Gadget libraries to configure the device as a CDC
Ethernet device, but unfortunately the PXA255 does not support
alternate configurations, and so cannot support the full CDC Ethernet
spec.
Instead, it implements a subset of the spec. I've been modifying the
CDC Ethernet driver example code to see if I could get the thing
talking to the Mac (apparently it works when connected to a host
running Linux 2.6.10+ kernel, or a Windoze host). I've finally gotten
the driver matching the Gumstix, and I'm kernel panicking.
Before I spend too much more time on this, I was wondering if anyone
who had more knowledge about CDC Ethernet and the Apple example code
might want to chime in. Is there code somewhere that already works?
Would you be willing to help me by answering questions? Is there
something I should be ware of?
Any help would be greatly appreciated. Thanks!
BTW, this CDC Ethernet subset (you can find a *very* brief description
at http://linux-usb.org/gadget/) does not have assigned class/subclass
numbers, and relies solely on vendor/product IDs. Someone (Compaq?) has
donated a vendor/product ID for use in this situation, but this strikes
me as less than ideal. Just FYI...
TIA,
--
Rick
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