You could configure teh MTRR registers to make a region WB. But it will 
still be tricky to make sure no unexpected writes happen to an area
pointing at SDRAM, since that will foul up the SDRAM control hardware
and/or the SDRAM itself. We've also seen cases where unexpected writes to
memory will blow the hardware up and cause a trap (intel). 

But, what a GREAT hack this would be ...

ron

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