[CentOS] New CD-ROM drive causes kernel panic

[Rodrigo Barbosa]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Wed, Dec 28, 2005 at 08:24:08AM -0500, Alfred von Campe wrote:
> >You might want to first check your BIOS settings for the CDROM drive,
> >and then the data cable. I really don't think there is such a thing
> >as an incompatible CDROM, but I have seen some BIOS settings making
> >CDROM drives behave weirdly.
> 
> What type of BIOS settings are you talking about?  The system is  
> currently up and running, so I can't easily check it (but I'll  
> probably reboot it later today).

DMA, Access mode, IRQs, IDE controle related settings. It will
depend on your exact BIOS version and brand.

> >I would recommend checking the master/slave jumper settings. Is the
> >cdrom drive the only drive on the cable? On what positions does the  
> >bios
> >report the drive (primary/secondary channel, master/slave?). changing
> >DMA settings for the drive may help too. How does Linux recognize the
> >drive (dmesg + /proc on which, as which drive hda, hdb, hdc, hdd?)
> 
> The master/slave setting is set to exactly the same setting (slave)  
> as the CD-ROM drive it replaced (there is another drive on that same  
> cable).  And how do I change the DMA settings?  I think this is what  
> may be causing the problem.  Linux currently doesn't recognize the  
> drive, as it is disconnected.  But I believe it's /dev/hdb (although  
> it might be /dev/hdd).  There are two hard disks at /dev/hda and /dev/ 
> hdc that are mirrored together and mounted as /home.

Having a Slave drive in a interface where a Master drive is nor
present violates the ATA standard, and can cause problems with
some chipsets. Unfortunately, that is a very common practice.

[]s

- -- 
Rodrigo Barbosa <rodrigob at suespammers.org>
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (GNU/Linux)

iD8DBQFDspSepdyWzQ5b5ckRAtS5AJ9KKPlD9+rgb4ZasYq2euliIWx1jACgtrpG
rTYZylKN4Bg6IlIFvGPGCq8=
=pInx
-----END PGP SIGNATURE-----