mbed-os/components/TARGET_PSA/TARGET_TFM/COMPONENT_SPE/mbed_lib.json

{
    "name": "tfm-s",
    "macros": ["MBED_FAULT_HANDLER_DISABLED", "BYPASS_NVSTORE_CHECK=1"],
    "config": {
        "max_ns_thread_count": {
            "help": "maximum allowed number of non-secure threads",
            "macro_name": "TFM_MAX_NS_THREAD_COUNT",
            "value": 10
        }
    }
}