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Currently the block UIO driver depends on the sDDF block virtualiser passing offsets instead of raw physical addresses. This was changed this au-ts/sddf@2d8dbee commit of sDDF and so we need to update the UIO driver accordingly.
Raw physical addresses suit native drivers better and having the same virtualiser code regardless of whether it's talking to a native driver or driver VM is important and so we should fix the UIO driver to accept/deal with physical addresses.
Originally the UIO block driver used offsets since it was easier and we had no native drivers.
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