[gentoo-laptop] problems with dma

[gentoo-laptop] problems with dma

[edgar Sanchez]

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hi:
i have an acer 4152lmi laptop,& i cannot activate de dma

hdparm -d1 /dev/hdc

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
Can anybody help me?
thx

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Re: [gentoo-laptop] problems with dma

[Marco Müller]

On Thu, 01 Dec 2005 17:18:19 +0100, edgar Sanchez <edysanchez@gmail.com>  
wrote:

> hi:
> i have an acer 4152lmi laptop,& i cannot activate de dma
>
> hdparm -d1 /dev/hdc
>
> /dev/hdc:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> Can anybody help me?

I had a similar problem with a debian machine. I solved it by starting  
some ide driver modules in a different order.


c ya
thancxs macxs
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Re: [gentoo-laptop] problems with dma

[Luis Ortiz]

Edgar Sanchez wrote:
> hi:
> i have an acer 4152lmi laptop,& i cannot activate de dma
> 
> hdparm -d1 /dev/hdc
> 
> /dev/hdc:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> Can anybody help me?
> thx

Make sure you compiled your kernel with DMA Support
   Device Drivers --->
      <*> ATA/ATAPI/MFM/RLL support
      ...
      [*]    PCI IDE chipset support
      ...
      [*]        Generic PCI bus-master DMA support
      ...
      [*]	 Use PCI DMA by default when available
      ...
Also know your laptop. There are some other options under "ATA/ATAPI/MFM/RLL
support" specific to hardware. You may have to select the appropriate so you can
use DMA. For example my laptop is a Compaq Presario r3000 model and the
motherboard is a nVidia nForce3, so I selected in "AMD and nVidia IDE support".

I hope I'm not wrong, and I hope this helps.

--
Luis Ortiz
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