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SubjectRe: Alot of DMA errors in 2.4.18, 2.4.20 and 2.5.52
> On Wed, Dec 25, 2002 at 12:58:20PM +0100, Tomas Szepe wrote:
> > > For some funny reason, a 2.4.20 kernel refuses to set the DMA-level on
> > > the new disks (all connected to a UDMA5-capable Ultra100 TX2 controller)
> > > to UDMA5,4,3 and settles it for UDMA2, which is the highest possibility
> > > for the OLD onboard-controller (but NOT for the promise card).
> >
> > You need to boot 2.4.19 and 2.4.20 with 'ideX=ata66' where X is the
> > number of the channel where you wish to use transfer modes above UDMA2.
> > For instance, "ide0=ata66 ide1=ata66" will do the trick for the first two
> hdparm -X69 /dev/hda will put it into UDMA5/ata100 mode as well
> (69 == 64 + UDMA mode). No need to specify it at boot time.

Not true. You definitely need to use the ideX boot param AND
run hdparm -X?? /dev/hd? to make use of UDMA3+ on newer PDC
controllers (unless you apply the patch posted on Dec 24 by
Nikolai Zhubr).

Tomas Szepe <>
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