> Also there is the problem that some drivers use ZONE_DMA allocations > because their device can only generate addresses below some limit, but > on a platform with an IOMMU there is in fact no restriction on what > memory the device can access.
Bzzzzzt - have to call your bluff on that one The IOMMU mapping window itself may be out of range of some devices. This is a big problem on AMD64 where the GART window is above the 2GB boundary - you can do 64->32 nicely but 32->31/30/28/24, all of which turn up on PC hardware, are no solved by the IOMMU only by GFP_DMA Alan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/