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monotonic counter in the iMX6Q

Question asked by Pablo Socolovsky on Jul 28, 2016
Latest reply on Aug 1, 2016 by Yuri Muhin

Hello everybody!

 

I am trying to build a system that uses a monotonic counter in the iMX6Q, but I struggle to find a complete information for the ERA.

The manual says it is typically connected to fuses, but no reference on the fuse map.

If era is not in the fuse map, is the whole 64 bit counter retained using the battery?

Looking at the SNVS_HPLR soft locks I guess it is possible to initialize the monotonic counter from a trusted source.

What happens when an overflow occurs? does the MC_ERA increments or a security violation is asserted?

In case the whole 64 bit counter overflows is eventually signalling a violation?

I think I can guess the answers, but I hate guessing...

 

I haven't found any reference to this topic elsewhere. Thank you guys!!!

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