Can't enable DMA when using IDE devices on SATA controllers

[wwp]

Hello Marcelo,


On Wed, 31 May 2006 13:06:54 -0300 "Marcelo Magno T. Sales" <marcelo.sales at sefaz.pe.gov.br> wrote:

> Hi,
> 
> I have several IBM desktops and some notebooks in which the IDE interface
> is a SATA controller, most of them Intel. Here's lspci output:
> -------------
> [marcelo.sales at sf002698 ~]$ /sbin/lspci | grep IDE
> 00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA 
> Controller (rev 03)
> -------------
> On these machines, I can't enable DMA on IDE devices. hdparm shows:
> -------------
> [marcelo.sales at sf002698 ~]$ /sbin/hdparm /dev/hdc
> /dev/hdc:
>  IO_support   =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  0 (off)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  HDIO_GETGEO failed: Inappropriate ioctl for device
> -------------
> When I try to enable DMA, I get:
> -------------
> [marcelo.sales at sf002698 ~]$ su -c '/sbin/hdparm -d1 /dev/hdc'
> /dev/hdc:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> -------------
> I thought this was caused by lack of kernel support for the SATA
> controller, but I've compiled the FC kernel and the vanilla kernel several
> times, with different settings, and have got no luck on this. libata is
> built and loaded, as shown by lsmod:
> [marcelo.sales at sf002698 ~]$ /sbin/lsmod | grep libata
> libata                 58065  1 ata_piix
> scsi_mod              129001  3 sg,libata,sd_mod
> 
> What needs to be done to enable DMA support? I'm using kernel 
> 2.6.16-1.2122_FC5smp.

Does this mean that none of the replies you got to your previous email
provided a solution?


Regards,

-- 
wwp
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