Large mmio resources and 4G+ of RAM...

Stefan Reinauer stepan at
Tue Jun 1 02:05:00 CEST 2004

* Eric W. Biederman <ebiederman at> [040601 08:05]:
> Looking the large memory mapped I/O resources all have 64bit BARs.  So
> I am just going to modify the LinuxBIOS resource allocator to put
> 64bit BARs on x86-64 boxes at least above the top of memory.
> There are a couple of short term hacks that I can do with relocating
> memory but on the Opteron the more memory I add the more problems
> I run into.  And moving BARS above 4G looks like the right term
> fix.

When running a 32bit operating system (like linux/x86) does this mean
that I am able to see more of my memory, but my pci devices will vanish?


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