reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/f7f00444a9ad2284192bfa6aaef7ce9be2d43388
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 7.2/bbr3
        git checkout f7f00444a9ad2284192bfa6aaef7ce9be2d43388

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=microblaze olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=microblaze SHELL=/bin/bash