RE: [PATCH 01/34] AMD IOMMU: add Kconfig entry

[Duran, Leo]

On Saturday, June 28, 2008 6:04 AM, Joerg Roedel wrote:

> Yes, there is only one exclusion range per IOMMU. The problem is that 
> an exclusion range from 64MB to the end may not be possible because 
> there is an exclusion range already configured in the ACPI table. On 
> my System for example the exclusion range is somewhere in the first 
> megabyte of RAM.
> In this case the direct mapping using page tables is needed. If there 
> is no exclusion range defined in ACPI this idea would work of course.
> 
> Joerg
> 

It would OK to have ONE all inclusive exclusion range (e.g., 64MB to
'end' if you want).
That is, any pre-defined areas would simply fall inside the larger
range.
And, if the ACPI table calls for exclusion of a range inside the
aperture (e.g., inside 64MB),
that range would have to be 'reserved', and set for 1:1 mapping.

Leo.

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