Hello,You probably didn't compile in the pci bus master dma support for the chipset your motherboard has into the kernel. If you just use generic pci bus-master dma support you usually get this problem.
In a computer with a disk capable of DMA.
hdparm -i /dev/hda returns: /dev/hda:
Model=Maxtor 6E040L0, FwRev=NAR61590, SerialNo=E13CFB3E Config={ Fixed } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=off CurCHS=17475/15/63, CurSects=16513875, LBA=yes, LBAsects=80293248 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5 udma6 AdvancedPM=yes: disabled (255) WriteCache=enabled Drive conforms to: (null):
* signifies the current active mode
but hdparm /dev/hda returns:
/dev/hda: multcount = 0 (off) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 65535/16/63, sectors = 80293248, start = 0
When I try turning the DMA on using hdparm -d1 /dev/hda I get:
/dev/hda: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)
I'm using Linux 2.6 and as much as I can see all the DMA options in the kernel are turned on. Can someone tell me what is the problem?
Thanks, Yuval Scharf
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For example, I have an nforce2 chipset, so I compile in "AMD and NVIDIA IDE Support". Check for you chipset under the generic DMA bus-master support tree.
Cheers, Kevin
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