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Buffer at fixed memory address ?

Hello All !
I have PCI board with PowerPC CPU and linux on it. All of it memory are 
visible over PCI. I want to create network connection between this board and 
a host computer.
I think the solution is to have a buffer on the board at fixed memory address 
and to access this buffer from host. Is this right solution ? If so, how to 
create buffer in memory at fixed address ? Is it possible ?

-- 
        Vladimir

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