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/mmind/linux-rockchip.git/commit/?id=3df28b6fda8f245dc725af78780f75d5f1bc079c
        git remote add rockchip https://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip.git
        git fetch --no-tags rockchip v6.15-armsoc/dts64
        git checkout 3df28b6fda8f245dc725af78780f75d5f1bc079c
        # 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