USB echi and Intel ICH
This updates the Philips tweak so that it also applies to late-model ICH chips from Intel. (Or so I'm told ... :) That's at least three EHCI implementations known to behave on Linux. (And one hopes VIA soon too...) It also cleans up a few comments relating to 64bit DMA; recent API spec updates make it look like no games are needed with the PCI DMA mask -- it doesn't change the segment used by pci_pool allocations, so it just needs to get turned on if the overall system does 64bit DMA. I've a query in to see if those Philips/Intel tweaks are chip quirks, or just something the EHCI 1.0 spec isn't at all clear about.
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