
- the `alignment' and `boundary' arguments in bus_dmamem_alloc() only serve as hints on how to break up a DMA transaction into chunks when necessary; it is not necessary on sparc DVMA hardware. - exclusively use the VM page size (i.e. PAGE_SIZE et.al.) when computing resource allocations. - remember the size of DVMA resource allocations in the private `_ds_sgsize' field in a dma segment descriptor.
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