It depends on how you publish your com_matrox_EffectDriver (Note the prefix, this is really important quite a few drivers are going to have effects right?) How does the 'Effect Driver' get created? How does your FrameBuffer get created? can we see the IOKitPersonalties? Godfrey At 13:24 -0400 02-5-30, Francis bouchard wrote: Sorry for cross posting but I am really desperate. For the one who followed this thread, here is the status. I would like my driver model to look like the drawing. My IOFrameBuffer declares an IOProvicerClass of EffectDriver (which its provider is an IOPCIDevice). This way My effectDriver which is a service provider for my FrameBuffer gets loaded before the IOFrameBuffer and the FrameBuffer gets the pointer to the EffectDriver (its provider through the parameter in the start routine. But it doesn't work! HELP!!!! How do I make a driver a provider for another class ??? If I put the IOProviderClass in the bundle settings, my driver won load (kmod but no init called). A hint is that ioreg or IORegistry crashes! for some reason, as soos as I try to connect my IOFrameBuffer ot the effect dirver I seem to break everything up. If I put IOPCIDevice in the IOProviderClass and "slmost stub my frame buffer" everything is OK. Francis On 28/05/02 12:52, "Francis bouchard" <francis.bouchard@matrox.com> wrote: I agree that I'm more fighting with IOKit than using it. Let's see how my drivers works. Let's try ou my _talent_ for drawing. ------ ------------------ | OS | | our effects | User Land ------ ------------------ ________________|____________________________|_________ KernelLand | | ------------------- ------------------ | IOFBUserClient | | EffectDriver | | IOFrameBuffer | | UserClient | ------------------- ------------------ | | | ------------------ |_______________________| EffectDriver | | (IOService) | ------------------ _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored. _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.