reproduce (this is a W=1 build):
        # https://github.com/Freescale/linux-fslc/commit/e621849d1464f98a17ed9a39307cc14fc210e8d3
        git remote add freescale-fslc https://github.com/Freescale/linux-fslc
        git fetch --no-tags freescale-fslc 5.15-2.2.x-imx
        git checkout e621849d1464f98a17ed9a39307cc14fc210e8d3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/phy/ drivers/soc/fsl/dpio/