reproduce (this is a W=1 build):
        # https://github.com/Freescale/linux-fslc/commit/9c44551f16501cd6708b9bba2aed2afbbfb59049
        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 9c44551f16501cd6708b9bba2aed2afbbfb59049
        # 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/