> Which in turn enables the iommu_merge functionality in gart_map_sg().

>       for_each_sg(sg, s, nents, i) {

Hmm, another thought. Maybe this code just has trouble with the new 
linked SG lists and it's not really a SB600 problem?

I did a quick test on two ATI machines with older chipset and iommu=force,merge
and it didn't show a problem though.

-Andi
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