mbed-os/features/storage/FEATURE_STORAGE/cfstore/mbed_lib.json

{
    "name": "configuration-store",
    "config": {
        "storage_disable": {
            "help": "Configuration parameter to disable flash storage if present. Default = 0, implying that by default flash storage is used if present.",
            "macro_name": "CFSTORE_STORAGE_DISABLE",
            "value": 0
        }
    }
}