[t13] What are the meaning of "set up the host DMA engine" and "initialize the DMA channel"?

[kepler]

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 On page 332 of ATA/ATAPI-6, it states that " The host shall have set up
the host DMA engine" prior to making the state transition HDMA0:HDMA1,
and "The host shall have initialized the DMA channel" prior to entering
the HDMA1 staet.
What are the meaning of "set up the host DMA engine" and "initialize the
DMA channel"?

Kepler