reproduce (this is a W=1 build):
        # https://github.com/rclaveau-tech/linux-khadas/commit/8fd3b956c364f13fc30b90a616b533dcb410a101
        git remote add rclaveau https://github.com/rclaveau-tech/linux-khadas.git
        git fetch --no-tags rclaveau b4/add-adla_npu-t7-vim4
        git checkout 8fd3b956c364f13fc30b90a616b533dcb410a101

        # install sparc64 cross compiling tool for clang build
        # apt-get install binutils-sparc64-linux-gnu
        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=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/accel/adla/