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...ixed several other issues including incorrect bus_dma support (it didn't handle deferred callbacks and EINPROGRESS at all). It also did not pre-allocate dma maps but attempted to create them on the fly (despite a comment claiming that it did pre-allocate them). It now probes disks using a configintrhook rather than using polled commands. The drive number for each logical disk is passed to the child disk device via ivars. I've added bus_dma sync ops for the hardware QCB accesses. I've also reworked it's queuing mechanism so that it should now queue multiple commands to the contro...