Problem with MMU with a custom board

Ok, I managed to solve the problem I put it here only for completeness.

The problem in fact was produced by my memory, the clock that I were using to fed it was produced by an PLL and was in phase with the clock of the system (100MHz), and that worked fine for the NO-MMU version.

But in the MMU version I had to put an delay in the SDRAM clock, which i set to -45 degrees, so the signals to the memory now have time to be set before the clock signal arrived, and then the system started to work OK.

I still don't get how the MMU forced the problem, but with the delay both system work without any problem that I can see (yet).

Thank for the help.