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As a newbie in Linux driver development, I’ve successfully recompiled a new kernel(2.6.39.4) upon my previous Ubuntu 11.04 (2.6.38-8-generic), and am going well so far. But I am wondering why do I need to recompile the kernel? Is it really necessary? I played with some simple driver samples on my previous kernel and they compiled and ran well.
It depends on the driver you are working on.
If the driver does not rely on any difference features between the two kernel versions, you don’t need to recompile the kernel, just compile the driver with the corresponding kernel headers. Otherwise, you must recompile the right kernel so that the driver could work properly.