MPC860 tlb exception handling

[Eric Valette]

Joel Sherrill wrote:
> 
> This code was probably derived from the original PPC403 Papyrus BSP
> where there should not have been any TLB faults.
> 
> What does a newer BSP like the mcp750/mvme2307/motorola_shared do?

There are no such fault that may occur on 604/750 because we use BAT
that cover all the memory range. So nothing special is done. I would
highly recommend to look at linux code. But be warned that it is fairly
complicated...

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