Shadow RAM control

Hi!

I have an AMD Athlon XP, an Northbridge VIA KT266A.
I want to write into the segment C000h, D000h, E000h in real mode.
But this is only possible be changing the Shadow RAM control.
I tried to change the PCI configuration address space of the Northbridge,
register 61h, 62h, 63h, but this doesn't work.

Do I have to change some else?
MTRR?
Other registers in the PCI configuration address space?
Has anyone of you done this before?

I can't find the data*** for the Northbridge VIA KT266A.
Where can I get/buy it?
If someone has please send it to me.

Thank you very much.

Guenther


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