reproduce (this is a W=1 build):
        # https://github.com/AsahiLinux/linux/commit/3ba9173a776695e19481d515c3c1135ca6d718d5
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux bits/170-atcphy
        git checkout 3ba9173a776695e19481d515c3c1135ca6d718d5
        # 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/apple/