FWIW, problems involving DMA have been noticed on systems based on a
series of the VIA chipsets (I think the 64x series... I forget the exact
numbers).
These problems seem to be corrected in the later kernels, but I suspect
the version included in PCQ 7.1 might have the buggy IDE drivers.
There are known issues of file system corruption due to enabling DMA on
boards containing these chipsets.
You might want to upgrade to a later version of the kernel (2.4.10 being
the latest) if DMA is a requirement.
Disabling DMA generally means lower performance, and unless the task at
hand asks for the highest performance, disabling DMA is not going to hurt
that much at all, expecially considering the headaches that might result
from enabling DMA and causing the filesystem to get corrupted.
-Naren
On Fri, 5 Oct 2001, Vinu Moses wrote:
> On Thursday 04 October 2001 07:42 pm, Duvvuri Venu Gopal wrote:
> > Now I updated the kernel with the one supplied on August 2001 PCQuest as
> > instructed. While updating I got the following error messages (??) any
> > clues?
> >
> > Hdd:command error : error 0x54
> > End-request : I/O error, dev 16:40 (hdd), sector �..
> > Hdd: command error : status = 0x51 { Drive Ready SeekComplete Error }
>
> It seems that your hard disk has problems with DMA access. Check your
> /var/log/messages and see if you get this error frequently. If so, then
> disable DMA on your hard disk by adding the following line in /etc/rc.local
> hdparm -d0 /dev/hdd
> I'm assuming that hdd is your hard disk.
>
> Incidentally, what brand and model of hard disk are you using?
>
> Regards,
> Vinu.
>
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