Re: [gentoo-user] Re: DMA for /dev/cdrom ?

[Andreas Burghardt]

On Mon, Jul 10, 2006 at 12:38:47PM +0200, Anno v. Heimburg wrote:
> Hi Andreas!
>
> > I really like to use DMA for my cdrom/burner but I cant figure out how to
> > make it working!
>
> > tapa ~ # hdparm -d1 /dev/cdrom
> > /dev/cdrom:
> > setting using_dma to 1 (on)
> > HDIO_SET_DMA failed: Operation not permitted
> > using_dma    =  0 (off)
>
> Two hints, perhaps they help
> - "hdparm -i $DEVICE" will display what the device can support
> - I would run hdparm on the physical device file, that is /dev/hdc, not on
> the cdrom-link.

tapa ~ # hdparm -i /dev/hdc   

/dev/hdc:

 Model=HL-DT-ST DVD-RW GWA-4082N, FwRev=CB03, SerialNo=4CA07617AFA8
  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:  mdma0 mdma1 mdma2 
  UDMA modes: udma0 udma1 *udma2 
  AdvancedPM=no
  Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3:  ATA/ATAPI-2
  ATA/ATAPI-3 ATA/ATAPI-4 ATA/ATAPI-5

 * signifies the current active mode

Hmm, I see AdvancedPM=no ...? Before I changed to Gentoo-Linux I was using
Ubuntu. If I copied files from the cdrom it was _very_ FAASST ... but now ... 

Thx for your help!

>
> > Does anyone of you know if there is DMA support for this cdrom-drive
>
> It sounds like a plain old ATAPI drive, so should work with the generic
> stuff. No specific knowledge about your drive, though.
>
> Anno
>
> --
> gentoo-user@g.o mailing list
>

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