reproduce (this is a W=1 build):
        # https://github.com/Freescale/linux-fslc/commit/ad2e04b9ae1c08fdba0019998693787013cd6c02
        git remote add freescale-fslc https://github.com/Freescale/linux-fslc
        git fetch --no-tags freescale-fslc 6.6-2.0.x-imx
        git checkout ad2e04b9ae1c08fdba0019998693787013cd6c02
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/ block/ drivers/