30 bits DMA and ppc

Benjamin Herrenschmidt benh at kernel.crashing.org
Mon Oct 31 08:41:54 EST 2005

> The non-iommu case might want to do that for other devices as well,
> i.e. 32-bit limited ones on 64-bit machines.

Yup, that would be useful with some 3rd party bridges that don't have an
iommu ... :)

> Yep, the table is already split once, and I'm not sure in retrospect how
> useful that split was anyway, it can maybe go away. Switching it around
> shouldn't be a big issue.

No real need to split permanently... the search could be restricted to a
given range easily.


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