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ATA/ATAPI using DMA: Difference between revisions
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For ATA, for each PRD entry in the PRDT, the driver must issue a Read/Write DMA command to the disk; specifying a StartLBA and a sector count.
When the drive completes each command it sends an IRQ (possibly also when transfer in progress), to let the driver know that it is ready to transfer the next batch of data to/from the disk controller. The driver should then read the Bus Master Register Status byte.
The formats of the commands are precisely the same as for the 28 and 48 bit PIO mode Read and Write commands, except for the value sent to the "Command" IO Port.
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