ATA/ATAPI using DMA: Difference between revisions

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ATA/ATAPI using DMA (view source)

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From the point of view of the OS, there is only a tiny difference between "regular" (Single/Multiword) DMA and any of the UDMA modes.
Most of the actual differences involve precislyprecisely how, and how fast, data is transferred between the disk drive and the disk controller. OS software has no direct control over that part of the process. The driver software issues exactly the same commands, in exactly the same way, for all the DMA methods (except ADMA).
 
The only control the rest of the system has, lies in the initialization of the disk drive and disk controller to mutually compatible DMA modes, during bootup. This will hopefully always be done correctly by the BIOS.
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