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Linux loadable kernel modules allow code to be added to a running Linux kernel.  Most device drivers in Linux can be built statically in the kernel image or as a Loadable Kernel Module(LKM).  Loadable kernel modules are installed into the kernel at run time from user space.  This page is not intended to be a complete tutorial for Linux loadable kernel modules as there is a lot of documentation for general build and use.  This page focuses on topics which are can be less obvious in the general documentation and are needed for a Xilinx specific solution using PetaLinux and/or Yocto generally.