Standard CDC-ECM can not work in Lion

I have built a standard CDC-ECM image(PID is 0x900D) for a device, it can work in Mac OS X 10.5/10.6; but failed in Lion.  It seems already find the driver but can not connect successfully in Lion.  What should I pay attention?   Besides, where can I find the default drivers of standard Mac CDC-ECM which is for USB Ethernet?  It should be in System/Library/Extensions, right?  
Thanks,
Jason

Drivers in OSX are in /System/Library/Extensions yes.
Unlike 10.5 and 10.6 Lion boots in 64bit mode and will not load 32bit kexts or kexts that contain powerpc code.
CDC devices ( and a  lot of modems / cellphone drivers ) failing in Lion is always the result of incompatible kexts. You can workaround this if you boot Lion into 32bit mode or  have a Snow-compatible ( Intel only, 32/64bit coded ) driver for the device.

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