Pre-compiled modules ==================== Some modules are pre-compiled due to needing cross-compilers present on the build/dev machine which is inconvenient. Makefile is ready to compile them again in case they are missing: 1) Prepare the linux kernel trees to build external modules, i.e.: kernel $ make ARCH= CROSS_COMPILER= defconfig kernel $ make ARCH= CROSS_COMPILER= modules_prepare For each architecture. See the Makefile to check which are the supported architectures. 2) Export the variables below to point to the right place: KDIR_: for each architecture it needs to point to a kernel tree configured as in (1) CROSS_COMPILER_.ko. After this the build system will recreate them.