TF-A TBB CoT verification and information.

My TF-A on the stm32mp157f-dk2 is built with all the proper parameters.

The FSBL is verified on a fused public key hash, but the device is not closed.

I can see that the FSBL has a successful authentication.

So I decided to check on the TBB CoT over the fip.

I've put TF-A on stm32mp157f-dk2 into LOG_LEVEL=50 (verbose).

But I still can't really tell any positive or negative flow from the CoT verification.

As far as I can tell, there is negative printouts in the code.

So it will probably complain if I get stuff wrong.

But right now I can't easily see any positive feedback (like the FSBL one).

I think it would be nice, for this high log level, to include some user digestible feedback regarding the TBB CoT process.

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