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

Hello Marcelo,


On Wed, 31 May 2006 13:06:54 -0300 "Marcelo Magno T. Sales" <marcelo.sales@xxxxxxxxxxxxxxx> 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@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@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@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@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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