I have a Dell Inspiron 2650 drive with a Toshiba DVD-ROM / CDRW combo drive onboard. It's attached to IDE as hdc. I am running Debian 3.0 Woody and had no problems getting the drive working when using /dev/hdc.

Now, I've installed ide-scsi as a module and removed ide-cd from the kernel by modularising "Include IDE/ATAPI CDROM Support" from ATA/IDE/MFM/RLL support. I am using Kernel 2.4.22 with supermount-ng patch and latest ACPI patch from sourceforge.

I cant get anything to mount on the drive using scsi emulation, but I can with IDE. Everything else seems to be fine, I'm not auto-loading either ide-cd.o or ide-scsi.o

Here's what I'm doing:

Situation 1: This works (will mount cd's but wont work as a writer)

modprobe ide-cd
mount -t iso9660 /dev/hdc /mnt/cdrom
mounts the cd OK and I can read it.

Situation 2: Does not mount CDs but xcdroast WILL READ + WRITE discs!

modprobe ide-scsi

mount -t iso9660 /dev/hdc /mnt/cdrom
complains that I am using the IDE device when using ide-scsi.

mount -t iso9660 /dev/scd0 /mnt/cdrom

(sorry ... windows box started acting up ... so this is a continuation of last post)

mount -t iso9660 /dev/scd0 /mnt/cdrom
Complains that "/dev/scd0 is not a valid block device"

The same happens if I use /dev/sr0, /dev/sg0 /dev/scd0,1,2,3,4,5 etc

Here's a dump of lsmod when I'm having the problem:

Moresse:~# lsmod
Module Size Used by Not tainted
ide-scsi 10800 0
pcmf502r3 64992 1
nls_iso8859-1 2812 2 (autoclean)
nls_cp437 4316 2 (autoclean)
i810_audio 22940 0 (unused)
ac97_codec 13076 0 [i810_audio]

I've modularised both ide-cd and ide-scsi. Meaning, that ide-cd is not loaded when scsi emulation is working. Before I modularised both ide-cd and ide-scsi, I had ide-scsi built in and NO IDE-CD. Same fault exactly.

dmesg looks like this:
(or at least I'm sure this is the bit you're interested in)

hdc: attached ide-scsi driver.
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: TOSHIBA Model: DVD-ROM SD-R2412 Rev: X015
Type: CD-ROM ANSI SCSI revision: 02
scsi : 0 hosts left.
hdc: attached ide-cdrom driver.
hdc: ATAPI 24X DVD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.12
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: changing to secondary root
hdc: attached ide-cdrom driver.
hdc: ATAPI 24X DVD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: changing to secondary root
Uniform CD-ROM driver unloaded
hdc: attached ide-scsi driver.
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
Vendor: TOSHIBA Model: DVD-ROM SD-R2412 Rev: X015
Type: CD-ROM ANSI SCSI revision: 02
ide-scsi: hdc: unsupported command in request queue (0)
end_request: I/O error, dev 16:00 (hdc), sector 64
isofs_read_super: bread failed, dev=16:00, iso_blknum=16, block=32
Uniform CD-ROM driver unloaded
Moresse:~#


Please note: I've no idea what the end_request: I/O error means. This gets added to DMESG after I try to mount a disc, but is not there before.

Can anyone shed some light on this? Thanks.

I have set "hdc=scsi" in the append line of lilo and re-installed lilo to activate the changes. This breaks the /dev/hdc capabilities, but doesn't fix the /dev/scd0 issue.

I've also tried hdc=ide-scsi and this also doesn't fix anything.

However,

Leaving hdc=ide-scsi off the append line, modprobing ide-cd, and mounting /dev/hdc does work fine. I have no problems with the drive under Windows, (curse it) so I'm sure the drive itself is OK.

On the posts, the hdc=scsi line is not included. So I guess that may account for some of the error messages. The question is guess is - what does /dev/scd0 is not a block device mean, considering ide-cd.o is not loaded and ide-scsi is loaded. Xcdroast has no problems using the drive at all, I just cant mount for some reason. Help!

Did you include scsi cdrom support?

no I didn't add scsi CD-ROM support. I will give that a try. Thanks for your reply, aaa.

That appears to have fixed it. Thanks.