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Hardware has lots and lots of pieces of memory, not only block-ram, but also many registers. The needs to be initialized after power-off.

As for the software: Hibernate is storing that initialized state.

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So would it be impossible/expensive to provide storage for those registers/memory etc. that can survive power-off, and then copy the state from there upon power-on?

How much time would something like that take compared to initialization?

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