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FeaturesMain »» OS4 Zone - FAQ
How do I enable DMA? 
(Read 3178 times) | Question - How do I enable DMA?
With OS 4.0 prerelease 2 you can enable DMA only on HD and only on a SIL CARD.
Source (Ikir)
From OS4:
idetool -x si680ide.device 0 70 -> Set device 0 to ATA133
idetool -x si680ide.device 1 69 -> Set device 1 to ATA100
idetool -u si680ide.device 0 -> See best pio mode, dma mode and current settings for device 0.
With prerelease update3 you can turn on DMA on optical devices, on all Sil (ATA133 and SATA) and on via (fixed XE and micro).
PIO 0 ( 3 MB/s, modeid 8)
PIO 1 ( 5 MB/s, modeid 9)
PIO 2 ( 8 MB/s, modeid 10)
PIO 3 ( 11 MB/s, modeid 11)
PIO 4 ( 16 MB/s, modeid 12)
UDMA 0 ( 16 MB/s, modeid 64)
UDMA 1 ( 25 MB/s, modeid 65)
UDMA 2 ( 33 MB/s, modeid 66)
UDMA 3 ( 44 MB/s, modeid 67)
UDMA 4 ( 66 MB/s, modeid 68)
UDMA 5 (100 MB/s, modeid 69)
UDMA 6 (133 MB/s, modeid 70) -
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