What is a good practical and/or spec'd size of NV storage to best
support Secure Boot?

In OVMF, we recently added support for NV variables. I chose what I
thought was a generous size of 56KB.

With a 4KB 'event log' and 4KB NV Working Store, this makes the NV
storage 64KB. Of course, we needed to reserve yet another 64KB to
backup this storage if the block needs to be erased. So, all told
128KB of flash.

Is this (56KB) a good size to support Secure Boot?

-Jordan

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