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PATA DMA is disabled



Hi,

2.6.18 (2647) did not fix the pata dma-problem:

[root helios ~]# hdparm -d /dev/hdc

/dev/hdc:
 using_dma    =  0 (off)
[root helios ~]# hdparm -d 1 /dev/hdc

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
[root helios ~]#

Or do I have to do some configuration change ?

cu romal



On Fri, Aug 25, 2006 at 04:39:28PM +0200, R.M.Albrecht wrote:
> But the canoncial solution would be to enable DMA ? Has anyone an idea
> where the problem lies ?

You need a new enough kernel to handle the ICH6M SATA and PATA together
nicely
and the devices not to be in compatibility mode.

Alternatively build 2.6.18-rc4-mm2 and select the Intel PIIX/ICH driver from
that without the "old IDE" PIIX driver and it should grab all the
devices and
put them under /dev/sda /dev/sr0 etc using libata.

Alan


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