64MB MMIO Hole ?

Li-Ta Lo ollie at lanl.gov
Wed Feb 11 16:30:01 CET 2004


On Tue, 2004-02-10 at 20:27, Eric W. Biederman wrote:
> ebiederman at lnxi.com (Eric W. Biederman) writes:
> 
> > Li-Ta Lo <ollie at lanl.gov> writes:
> > 
> > > Eric,
> > > 
> > > You put a preprocessor warnning for 64MB MMIO Hole in
> > > the amdk8/northbridge.c.
> > >  
> > > #warning "FIXME improve mtrr.c so we don't use up all of the mtrrs with
> > > a 64M MMIO hole"
> > > 
> > > What exactly is it ? Is that for the AGP aperture (you call it 
> > > IOMMU_APERTURE) ?
> > 
> > No, although the IOMMU_APERATURE plays a role there.  But this
> > was implemented before I implemented the IOMMU_APERATURE code
> > in misc_control.c
> 
> The IOMMU_APERATURE is just another large I/O region as far
> as that code is concerned.
>  

But you also used it for AGP aperture in misc_control.c. Is there
any reason to do this ? Or the AGP aperture can actually be anything
else.

Ollie





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