memory protection is not strictly part of the MMU. some processors
implement
MPU's (like the Blackfin processor) and the kernel supports it just fine.
that gets you standard data/instruction rwx control.
OK, I had never heard of it done that way before. That's neat.
Certainly not typical of a nommu system though.
Blackfin is is weird in that way. It essentially offers a limited MMU by
giving you protection without the ability to remap addresses. In fact, the
Blackfin documentation calls it an MMU. So, it really isn't a nommu
processor with protection. It is an MMU processor with no virtual
addressing.
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