Re: DMA problem

[Uwe <k8user@web.de>]

On Tuesday 05 April 2005 21:19, Bhushan Kulkarni wrote:
> Hello List ,
>        i have sis5513 ide controller , when i try to enable DMA for my
> Harddisk , cdrom,
> i get following message -->
>
> # hdparm -d1 /dev/hda
> /dev/hda:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
>
> I am running  "2.6.11-9-amd64-k8" kernel ..  I have added sis5513
> module to /etc/modules at the top. Still facing same  problem.
>
> How can i enable this DMA ??

this is exactly the same problem i still have.
i think the problem is related to the many many ide-modules that are loaded. 
they may interfer with each other preventing the sis5513 module to work 
properly. unfortunately i don't know how to prevent them from being loaded. 
it seems, that the initrd might contain the code that loads them. since now i 
didn't find a way to disable the unneeded modules. my last message adressing 
this is without any reply.

a little workaround wich is in fact absolutely unsatisfying is installing an 
additional pci-controller card. i added a promise-type that is tremendously 
faster and cpu-conserving because it works in dma mode. since this brings up 
some device hassle my system disk is still without dma.

the left question is how to prevent the unneeded ide-modules from being 
loaded. somebody an idea???

greetings
uwe

-- 
-------------------------------
ASUS K8S-MX, 2800+ (754), 512MB, gnuLinux v2.6.x