hdparm.conf

[Wenzhuo Zhang]

On Thu, Jul 28, 2005 at 07:43:29PM +0200, John Nilsson wrote:
> > CONFIG_IDEDMA_ONLYDISK checked. So, DMA is not enabled for IDE CDROMs.
> 
> I didn't get DMA for the disk either. This is what I had to ebable:
> 
> 
> /dev/hda {
>         mult_sect_io = 16
>         interrupt_unmask = on
>         dma = on
> }
> 
> /dev/hdc {
>         dma = on
> }

Two possible reasons:

1. The kernel does not support your chipset well.

2. The hdparm init script gets run very early in the sysinit stage, and the ide
drivers haven't been loaded yet; i.e. "Setting disc parameters..." occurs
before "Loading modules...". This problem can be easily resolved by updating
the initrd image to load the required ide drivers first.

$ sudo su -
# cp -p /etc/mkinitrd/modules /etc/mkinitrd/modules.orig
# vi /etc/mkinitrd/modules

and add the following lines to /etc/mkinitrd/modules:

piix
ide-core
ide-cd
ide-disk
ide-generic

Depending on your motherboard chipset, you may have to replace piix with
something relevant.

Then, regenerate the initrd image:

  # cp -p /boot/initrd.img-2.6.10-5-686 /boot/initrd.img-2.6.10-5-686.orig
  # mkinitrd -o /boot/initrd.img-2.6.10-5-686 2.6.10-5-686

Hope it helps,

Wenzhuo