[ILUG] IDE DMA problem

[Petko Alov]

On 27 Jun 2000, at 14:36, Niall  O Broin wrote:

> I've been trying to tune my IDE performance using 
hdparm but it refuses to
> turn on DMA with the following error
> 
> bagend:~ # hdparm -d 1 /dev/hdd
>  
> /dev/hdd:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
>  
>  
> and I have the following in my dmesg output 
> 
> Uniform Multi-Platform E-IDE driver Revision: 6.20
> ALI15X3: IDE controller on PCI bus 00 dev 78
> ALI15X3: not 100% native mode: will probe irqs later
> ALI15X3: simplex device:  DMA disabled
> ide0: ALI15X3 Bus-Master DMA disabled (BIOS)
> ALI15X3: simplex device:  DMA disabled
> ide1: ALI15X3 Bus-Master DMA disabled (BIOS)

This is a problem with ALI 15xx series of IDE controlers 
(look at kernel config - you can choose  experimental 
support for ALI 14xx, not for 15xx). There is driver (beta) 
on ALI site:

ftp://www.ali.com.tw/driver/linux-ide-10b3.tgz

(for alternative sites look at 
http://www.ali.com.tw/eng/support/driver.shtml )

Though personally didn't try it...

 


Regards,

Petko

============================
Petko S. Alov

System Administrator,
BIO.BAS.BG

palov at bio.bas.bg
(+359-2) 979-2175
============================