reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/d3ff7fd1228dd58c0c884c02708793e04dbe1629
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Siddaraju-DH/net-ethtool-add-BaseC2C-medium-AUI-C2C-link-modes/20260928-040656
        git checkout d3ff7fd1228dd58c0c884c02708793e04dbe1629

        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=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=nios2 SHELL=/bin/bash drivers/net/phy/