Can't enable dma on /dev/hda

Can't enable dma on /dev/hda

[maxxle]

Hi!

I'm running a debian 3.0 System using kernel 2.4.19 (also tried 2.4.20).
On this system it's not possible to enable dma on /dev/hda (HDD IDE)

The MoBo is a VIA Board called VIA-C3M266 (CLE266 chipset)
Northbridge: VT8623
Southbridge: VT8235

My kernel is compiled with this features:
ATAPI/IDE/MFM/RLL support --> IDE, ATA and ATAPI Block devices --> 
[*] generic PCI bus-master DMA support
[*] Use PCI DMA by default when available  
[*] VIA82CXXX chipset support

And this is what hdparm tels me:
hdparm -d 1 /dev/hda:

/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)


What can I do to force my system to run using dma on /dev/hda.
Or is my CLE266 chipset a bit too new for being supported by 2.4.19/20?


Hope somebody is able to help me


maxxle

Re: Can't enable dma on /dev/hda

[agri]

I suppose that your chip is not supported by kernel. :-(

Kernel support only 82C*** chips... as you see, it's not your chip.
i have VT82C598 bridge, and dma is available on my system.

Agri

---------- Original Message -----------
From: maxxle@t-online.de (maxxle)
To: linux-kernel@vger.kernel.org
Sent: 11 Feb 2003 19:31:16 +0000
Subject: Can't enable dma on /dev/hda

> Hi!
> 
> I'm running a debian 3.0 System using kernel 2.4.19 (also tried 
> 2.4.20). On this system it's not possible to enable dma on /dev/hda 
> (HDD IDE)
> 
> The MoBo is a VIA Board called VIA-C3M266 (CLE266 chipset)
> Northbridge: VT8623
> Southbridge: VT8235
> 
> My kernel is compiled with this features:
> ATAPI/IDE/MFM/RLL support --> IDE, ATA and ATAPI Block devices --> 
> [*] generic PCI bus-master DMA support
> [*] Use PCI DMA by default when available  
> [*] VIA82CXXX chipset support
> 
> And this is what hdparm tels me:
> hdparm -d 1 /dev/hda:
> 
> /dev/hda:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> 
> What can I do to force my system to run using dma on /dev/hda.
> Or is my CLE266 chipset a bit too new for being supported by 2.4.19/20?
> 
> Hope somebody is able to help me
> 
> maxxle
> 
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------- End of Original Message -------

Re: Can't enable dma on /dev/hda

[Alan Cox]

On Tue, 2003-02-11 at 19:31, maxxle wrote:
> Hi!
> 
> I'm running a debian 3.0 System using kernel 2.4.19 (also tried 2.4.20).
> On this system it's not possible to enable dma on /dev/hda (HDD IDE)
> 
> The MoBo is a VIA Board called VIA-C3M266 (CLE266 chipset)
> Northbridge: VT8623
> Southbridge: VT8235

You need 2.4.21pre for the 8235