reproduce (this is a W=1 build):
        # https://github.com/l1k/linux/commit/cb3e63129bf354a30602aa836e07fd2dd591b4dd
        git remote add l1k https://github.com/l1k/linux
        git fetch --no-tags l1k spdm-future
        git checkout cb3e63129bf354a30602aa836e07fd2dd591b4dd
        # 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 prepare