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A mmiotrace (Memory-Mapped Input/Output trace) allows to trace what the proprietary driver sends and reads to/from the card.
Mmiotraces (which are usually several millions-lines long) allow the pscnv/nouveau devs to get a working way to set-up the hw. This is just a starting point. When you've managed to get one feature to work, you usually try to understand what each register does.
Without the starting point, we can't do anything. So, when asked for a mmiotrace or if you want to provide developers with a trace for a just released hardware (like the Fermi ones), please follow the steps described under ;)
How to make a mmiotrace for power management?
Please follow this README