[PATCH v22 02/10] firmware: arm_rmm: Check for RMI support at init

[Sudeep Holla]

On Wed, Oct 14, 2026 at 12:06:54PM +0100, Suzuki K Poulose wrote:

[...]

> 
> Then it is RMM's problem if it doesn't check that the right level of
> SMCCC version is not implemented by the EL3. Also, where do we stop
> the checks ? e.g., We need SMCCC >= v1.3, when SVE is supported.
> And >= v1.4 if SME is supported. Shouldn't we leave this to the RMM
> to verify on init and fail the init ? I can raise this with the
> tf-RMM team.

Fair enough for v1.3+/SME/SVE checks, but RMI interface relying on more
that 8 input registers for one or more of it's interfaces (e.g.
RSI_ATTESTATION_TOKEN_INIT, RSI_MEASUREMENT_EXTEND, ...etc) indicate
it can't work with SMCCC v1.1 or below
.
So IMO check for v1.2+ is completely justified here.

-- 
Regards,
Sudeep