If anyone doing EFI or OSX kext disassembly has seen code that is playing with the PCI root hub express control registers specifically with link control and NVidia chips set, a pastbin of the code would be nice. Or just point me to the kext in question.

Also any code/kext that might by playing with a clock generation chip that might control pci-e bus speed. The clockgen chip would be off an SPI bus.

This is to figure out why the AppleTV runs the pci-e bus at X16 to the Nvidia 7300 chipset under it's native OSX but only X2 under a Tiger/Linux install.