Oops, so much for my testing! Thank you @tyama501.

CONFIG_EXEC_MMODEL duplicate

I'm aware of this problem, but haven't figured a great way to fix it yet. It results from the forced definition in elks/fs/config.in:

    bool 'Support compressed executables'  CONFIG_EXEC_COMPRESS       y
    if [ "$CONFIG_EXEC_COMPRESS" == "y" ]; then
        define_bool CONFIG_EXEC_MMODEL y
    fi
    bool 'Support medium memory model'     CONFIG_EXEC_MMODEL         y

The define_bool is required to force CONFIG_EXEC_MMODEL when compressed executables are set, then apparently the bool in the next line sets it again.

I removed the second definition in the committed files because I was trying to keep the configuration files as simple as possible, rather than match make menuconfig output exactly. Perhaps that should change?