Re: How do I add a drive to the DMA blacklist?

[Valkai Elod]

On Mon, 26 Nov 2001, Mark Hymers wrote:

> On Sun, 25, Nov, 2001 at 06:17:08PM -0500, Jonathan Kamens spoke thus..
> > How do I get a drive added to the DMA blacklists in ide-dma.c?  I sent
> > E-mail to Andre Hedrick in August about a drive that claims to support
> > DMA but flakes out as soon as the kernel tries to use it -- the "WDC
> > AC31000H".  This is not surprising, since all the other WDC drives of
> > this vintage have the same problem.  I included a patch to add this
> > drive to the two blacklists in ide-dma.c.  Andre never responded to my
> > E-mail, and the drive still hasn't been added to the blacklists.
> >
> > Am I doing something wrong?  What do I need to do to get this drive
> > added to the blacklists?
> Actually, while this subject is being brought up, if I don't do:
> /sbin/hdparm -d0 /dev/hdc
> on bootup, my system locks up randomly.  Looks like a DMA issue with my
> hdc drive.. Details are:
>
> /proc/ide/hdc/model:
> QUANTUM FIREBALLlct08 26

This seems to confirm my doubts about Quantum lct drives' sanity. I'm
having two drives: a Quantum CX 13G, and a Maxtor 40G@5400. Both work with
UDMA33 (mb doesn't support more). When i put a QUANTUM FIREBALL lct20 20G
drive in my rack, random lockups occur. I'd put all Quantum LCT drives on
the blacklist!

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