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материнка AsRock P4VM800 
chipsets:
north bridge: VIA P4M800 CE
south bridge: VIA VT8237R
дистрибутив sisyphus (текущий)
ядро kernel-image-std26-up-2.6.16-alt4

при попытке включить DMA на IDE винчестере WD800 (80Gb)

hdparm -d 1 /dev/hda

/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

под ядром 2.4 все ОК ( биосе DMA включено)