Sebastian Kuzminsky wrote:
Hi folks, hdparm's got me confused.
..
"hdparm /dev/hda" says:
.
DMA: mdma0 mdma1 *mdma2
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
..
The *mdma2 means, that if you were to issue a READ_DMA (or WRITE_DMA)
command to the drive, the drive is expecting the host to use
the multiword-dma-2 protocol and timings for it.
Meanwhile, the host may, at its option, simply use PIO commands (READ, WRITE)
instead of DMA, any time it chooses.
Drives have both a DMA mode, and a PIO mode, each of which is selected
and used independently of the other.
Cheers
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