Can't enable DMA when using IDE devices on SATA controllers
Marcelo Magno T. Sales
marcelo.sales at sefaz.pe.gov.br
Wed May 31 16:06:54 UTC 2006
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.
Thanks,
Marcelo
More information about the users
mailing list