example of how to detect emunand

emummc_detection.cpp

struct EmummcPaths {
    char unk[0x80];
    char nintendo[0x80];
};

void smcAmsGetEmunandConfig(EmummcPaths* out_paths) {
    SecmonArgs args{};
    args.X[0] = 0xF0000404; /* smcAmsGetEmunandConfig */
    args.X[1] = 0; /* EXO_EMUMMC_MMC_NAND*/
    args.X[2] = (u64)out_paths; /* out path */
    svcCallSecureMonitor(&args);
}

bool isEmunand() {
    EmummcPaths paths{};
    smcAmsGetEmunandConfig(&paths);
    return (paths.unk[0] != '\0') || (paths.nintendo[0] != '\0');
}