Just a general note: the MMU slows down memory accesses a bit (depending on the MMU type, on how it's programmed and what it is asked to do); therefore, if not needed to get the hardware to work properly and/or for other functional requirements (e.g. detecting memory hits, remapping the Kickstart ROM to FAST RAM on boards which can't do that automatically, etc.), one should evaluate whether MMU usage is actually beneficial.
Personally, I wouldn't use it just to remap the vectors table in FAST RAM.
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