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do support 64bit addresses, the current SCRIPTS code supports only 32bit addresses causing data corruption for buffer addresses >4GB. This problem affects 64bit machines with more than 4GB RAM or amd64 with 4GB and memory hole remapping. Work-around this problem with a bus_dma tag that requests bounce-buffers for addresses >4GB. This causes some overhead, but given the maximum SCSI bus speed of 160MB/s compared, the effect should hardly be noticeable. The problem was reported by Mike Watters (mike at mwatters net) who also verified that this fix cures the problem. Since this change is a NOOP on systems with less than 4GB RAM and fixes data corruption (in RAM and on disk) on systems with more than 4GB, I hope that this change is accepted for 8.0. MFC after: 3 days (pending approval)
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