compat-wireless as a whole aims to always be compiled and used with the oldest stable kernel supported by kernel.org. This will be the oldest stable kernel on the 2.6. series listed on the kernel.org front page. Sometimes we'll go even beyond that. Backporting compat-wireless involves backporting some subsystems but at times we may want to support compiling only certain drivers on older kernels since its easier to backport some subsystems. Such is the case with PCI drivers. This directly exists to allow developers enable compilation of compat-wireless on older drivers using ./scripts/driver-select Upon selection of a driver a patch from this directly will be applied to allow further compilation of one driver onto even older kernels.