reproduce:
        # https://github.com/jcmvbkbc/linux-xtensa/commit/8ab3ed66b691770a8ae3c88ece2b28eed78aca7f
        git remote add jcmvbkbc-xtensa https://github.com/jcmvbkbc/linux-xtensa
        git fetch --no-tags jcmvbkbc-xtensa xtensa-6.8-rc2-esp32
        git checkout 8ab3ed66b691770a8ae3c88ece2b28eed78aca7f
        # 1. reproduce by kismet
           # install kmax per https://github.com/paulgazz/kmax/blob/master/README.md
           kismet --linux-ksrc=linux --selectees CONFIG_ESP32_IPC --selectors CONFIG_ESP32_WIFI_SHMEM -a=alpha
        # 2. reproduce by make
           # save the config file to linux source tree
           cd linux
           make ARCH=alpha olddefconfig