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For example, ARM_SMCCC_TRNG_VERSION does not use x1, > > while SMC_RSI_ABI_VERSION does. Another VERSION call could use both x1 > > and x2. The only consistent behavior is to return > > SMCCC_RET_NOT_SUPPORTED when the SMCCC function ID is not supported. > > True, relying on "SMCCC_RET_NOT_SUPPORTED" => Function ID is not > supported is the safe way. If one of the parameters are not supported, > then the call should return INVALID_PARAMETER. If the FW is perfect :) Jason