It appears the drives do support dma - but maybe something else is going
on. Here's the output on each drive:
/dev/dvd:
Model=TSSTcorpDVD-ROM TS-H352A, FwRev=TS01, SerialNo=
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=0kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2
AdvancedPM=no
Drive conforms to: ATA-2 X3T10 948D revision 3:
* signifies the current active mode
linux:/home/dennis # hdparm -i /dev/dvdrecorder
/dev/dvdrecorder:
Model=SAMSUNG DVD R/RW SH-W08A, FwRev=1S30, SerialNo=74RB502107
Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
BuffType=unknown, BuffSize=2048kB, MaxMultSect=0
(maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 *udma2
AdvancedPM=no
Drive conforms to: Reserved:
* signifies the current active mode
Dennis
On Thu, 2005-02-03 at 16:32, Todd A. Jacobs wrote:
> On Thu, Feb 03, 2005 at 04:18:22PM -0800, Dennis Bagley wrote:
>
> > "setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not
> > permitted using_dma = 0 (off)"
>
> Are you *sure* the drive supports DMA? Check the output of "hdparm -i"
> or "hdparm -I" to find out of the drive's chipset even supports it. You
> can also try passing dma=on or ide1=dma to your kernel at boot, if it
> supports the flags.
>
> If none of these work, you need to consider the possibility that you
> have a weird chipset in either your drive or motherboard, and will need
> additional hardware to make further progress.
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