Here it is.

On Sun, Apr 13, 2008 at 3:53 PM, erik quanstrom <quanstro@quanstro.net> wrote:
> that error occurs when you try to do dma on a controller that says it
>  doesn't do dma.  this bit is found in pci space & loaded into
>  pcidev->ccrp — pci programming interface class code.  for ide-styled
>  devices, this register is defined as
>         busmaster | 1<<channel*2
>  or
>         0x80 | 4 | 1 == 0x85
>
>  the most likely cause of the problem is that this register is
>  misprogrammed, but the dma area is actually there.  so as always, the
>  output of pci would be very helpful.
>
>  the linux "ide" code that linux ignores this bit for intel
>  controllers.  i think the linux "ata" code ignores it too, but i could
>  have missed something in 60k lines.
>
>  - erik
>
>
>
>  > Ok, I've just pulled (I now have a /bin/cdfs from 26th of March) however
>  > I still get the same errors.
>  >
>  > I have tried with a CD-RW and a DVD+RW.
>  >
>  > cat /dev/sdC0/ctl gives me this:
>  > inquiry HL-DT-STDVDRAM GSA-U10N 1.05
>  > config 85C0 capabilities 0F00 dma 00550004 dmactl 00000000
>  > part data 0 2141
>  >
>  > ah and 'dmaon' had this displayed:
>  > "disabling dma: not on a busmastering controller"
>  > (I guess dmactl at 00000000 is in accordance with that?)
>  >
>  > Thanks,
>  > Mathieu.
>
>
>



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