Re: IDE DMA and CD-ROM

Andre M. Hedrick (hedrick@astro.dyer.vanderbilt.edu)
Sun, 29 Nov 1998 18:14:29 -0600 (CST)


Yes..........and it is in the works...............since the inception of
the PDC20246 chipset code..............the dreaded UDMA cdrom has hung the
system.........

What is the chipset you are using?

On Sat, 28 Nov 1998, Antti Andreimann wrote:

> Hi!
>
> Im really sorry if this question has already been discussed somewhere.
> Im just new to this list and I couldn't dig myself through archives Yet.
> The problem is following:
> I have a Toshiba 32X CD-ROM Drive and Tomato Motherboard. The CD Does not
> like DMA transfers. But IDE controller seems to be convinced othervise.
> I can't just put hdparm -d0 /dev/cdrom to bootup scripts because when there's
> no CD in the drive hdparm is unable to open the device. I can disable the DMA
> in IDE driver but then it will disable DMA for all drives. Of course I can
> re-enable it with hdparm but it's annoying :-(
> The BIG question: Is there a way to tell ide driver that it should disable DMA
> for one drive only at bootup? I didn't find a clue about DMA related options
> in Documentation/ide.txt :-(
>
> --
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> \|||||||||||||||||\ anttix@cyberix.edu.ee
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Cheers,
Andre Hedrick
The IDE-FNG for Linux
The APC UPS Specialist for Linux

http://www.dyer.vanderbilt.edu/server/udma/
http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.5.0.bin.tar.gz

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