reproduce (this is a W=1 build):
        # https://github.com/frank-w/BPI-R2-4.14/commit/657b088cd0f209f0e854466b0beb68911b6ed836
        git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14
        git fetch --no-tags frank-w-bpi-r2-4.14 7.1-rc
        git checkout 657b088cd0f209f0e854466b0beb68911b6ed836

        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=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash drivers/net/ethernet/mediatek/ drivers/net/phy/as21xx_1.9.2/