reproduce (this is a W=1 build):
        git checkout 0af2f6be1b4281385b618cb86ad946eded089ac8
        b4 shazam https://lore.kernel.org/r/20250501-20-k1-sdhci-v2-2-3e7005fae29b@gentoo.org
        # 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/mmc/host/