The peculiar problem is, the kext works on one machine - a PowerBook
G4 running 10.3.6, but do not work on another identical PowerBook nor
on a Sawtooth G4 running 10.3.7.
My educated guess on why it works in some machines and not some others
is due to the fact that your "codeless" kext is looking for a CFBundle
of "edu.vanderbilt.fel.mendenhall.USB_Interface_Grabber" and that
module (wherever it comes from) is not present in one machine and not
the others.
The idea behind using a codeless kext in this case is to prevent the
IOUSBHIDDriver from matching to the interface. The HID driver is
"class" driver, so it matches at a relatively lower probe score (see
http://developer.apple.com/qa/qa2001/qa1076.html for matching details).
In order to prevent the HID driver from matching we need a kext that
will (1) match with a higher probe score, and (2) return true from the
start() method (so the kext is loaded).
The easiest way to achieve this is to have a personality that specifies
a vendor specific matching to your interface (or to your device if
you're writing a device driver) and have it use IOKit as the "driver"
for it. The way to do this is to specify:
I trust that implementing it with those changes will yield the desired
results.
HTH,
--
Fernando Urbina
USB Technology Team
Apple Computer, Inc.
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