pci express bar over 4gb

[protagora27 protagora27]

Hello Folks,

I have intel desktop board dx48bt2. I'm developing sw under linux
2.6.24  x86_64  for a pci express card ( pci express 2.0 compliant).
I have to setup pci bar over 4 gb but bios uses value e0000000 as base
address for pcie boards.
I have seen that pciexbar is a register ( x48 chipset)  that decides
where pcie boards are mapped inside memory map.
My goal is rewriting pcibar 0 e pcibar 1 with a value above 4gb. Maybe
 I have  to rewrite pciexbar and then rewrite pci bar in my board.
Questions:
1) can I rewrite  pciexbar  and where ?
2) can i rewrite pcibar 0 and 1 with a value over 4 gb
3) If i change bar 0 and bar 1 after linux startup have i to use hotplugging ?

Thanks

Luca
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