Re: [PATCH] x86/PCI: never allocate PCI MMIO resources below BIOS_END

[Jesse Barnes]

On Mon, 26 Apr 2010 14:44:50 -0700
"H. Peter Anvin" <hpa@xxxxxxxxx> wrote:

> >
> > Agreed.  The trickier part is handling any platform devices that
> > request_resource against that space.  But maybe we don't need to do
> > anything special; just making sure we avoid it in the PCI "BIOS" code
> > as Bjorn did may be sufficient.
> >
> 
> Why is that hard?  If a platform device does a request_resource against
> that space, it's a request for specific address space and it should be
> granted.

I was thinking if we made it a special resource type we'd have to
change any platform drivers to use it; i.e. it wouldn't be
IORESOURCE_MEM or IORESOURCE_IO but IORESOURCE_DRAGONS.  That way it
wouldn't be part of the normal resource space.

But that's definitely overkill.  I think Bjorn's fix is sufficient.

-- 
Jesse Barnes, Intel Open Source Technology Center
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