The 645 and 646 have fixed compression parameters. Off 16 0x10 Memory allocation of buffers, etc. The fbufs , mbufs and trace parameters are global and apply to all connected cameras. Each camera has its own set of buffers. The default of defaults is QCIF size at 10 fps, BGR order.
All parameters are optional.
Recompile and install your kernel without this. Second, I've received a number of error reports that unfortunately have nothing to do with my driver. But appearantly this fails, and the USB device does not accept the new address. Try to search the archives first. This isn't strictly related to the Philips Webcam modules, but it's useful information anyway.