[vbox-dev] PDM virtual PCI device bar size

Nikolay Igotti igotti at gmail.com
Wed Apr 24 00:08:19 PDT 2013

  Which chipset you are using? ICH9 generally shall be better suited for 
your needs, due to recent
PCI features support.


23.04.2013 18:25, José Massada ?????:
> Hi all,
> I'm working on a PDM virtual PCI device module and I need to have a 
> bar size of 512MB.
> This particular PCI device uses bar 0 and 1 for register blocks (64KB 
> each) and bar 2 for memory (this one I need to be 512MB or even bigger).
> Registering the memory bar using the MMIO2 functions fails when the 
> size is bigger than 256MB (hard coded limit in the allocation 
> function) so I tried registering using MMIO. It seems to work but my 
> read and write callbacks never get called (bar 0 and 1 also use MMIO 
> and their callbacks always get called). I tried decreasing the bar 2 
> size and the callbacks got called.
> Is this even possible without modifying VBox source code? What am I 
> missing?
> Thanks,
> Jose
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