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e3ace39
(Get the code!)
Martin, yes it is possible to switch between XAA and EXA on a per-model basis. The trade-off is that Intel will *only* support EXA, so we would not be able to upstream bugs for any chips that use XAA. They asked us last year to stop using XAA and move to EXA for all chips, in order to make it easier for them to provide support.
We've actually had a series of problems with 8xx chips ever since moving from -i810 to -intel in the Hardy timeframe. There have been a series of performance and stabilization regressions on these old chips as upstream has moved forward, that seem to not be getting attention. Indeed, they have completely dropped support on i815 and some of the other very early 8xx chips.
So, if XAA makes things better on i845, we can consider moving to it, but understand that once we do so we probably won't be able to get any other bugs fixed on this chipset.