Re: Buffer at fixed memory address ?

[Om <omanakuttan@xxxxxxx>]

Vova wote:
> But what will happen if memory which I try to remap are already in use ? Will 
> kernel automatically free that memory ?
Kernel will not free it because it is not allocated. Actually kernel 
will not even see it as normal memory. If the PCI device is programmed 
to exhibit the internal memory to the outside (i.e, In the BAR registers 
and prefetchable/non-prefetchable registers), then only this memory 
becomes visible to the kernel as PCI accessible memory. You will have to 
map this memory to some address space and have your own routines to 
allocate and deallocate memory from this pool.

I hope things are more clear.
I wouls strongly suggest reading the "pci system architecture" by 
shanley and anderson.

HTH,
Om.

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