reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/mediatek/linux.git/commit/?id=b0a4ce81f327eae06c1088f1a437edc48a94a3e8
        git remote add mediatek https://git.kernel.org/pub/scm/linux/kernel/git/mediatek/linux.git
        git fetch --no-tags mediatek v6.11-next/dts64
        git checkout b0a4ce81f327eae06c1088f1a437edc48a94a3e8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash dtbs_check