usrdma - User-Level DMA engine support interface.
The special files associated with the user-level DMA engine support
interface provide access to DMA engines via the library udmalib(3X).
These files should not be accessed directly by a user. Currently, the
only DMA engine supported is under VME on the Challenge/Onyx series.
However, as more DMA engines become available for VME and other busses on
other platforms, access will be provided through this interface.
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