yOn Fri, 30 Mar 2001, Michael R. Jinks wrote:
> Our file server has an IDE CD-RW. Recently I replaced the stock Red Hat
> 7 kernel, using 2.2.18 with SCSI emulation turned on, with hopes of
> being able to use the CD-RW under cdrecord.
>
> Well, the new kernel appears to have broken CD-ROM support altogether:
>
> [root@fs2 /root]# mount /mnt/cdrom
>
> mount: the kernel does not recognize /dev/cdrom as a block device
> (maybe `insmod driver'?)
>
> I _thought_ that I had turned on all the options that I need in order to
> enable the CD-ROM, I've done this a bunch of times before, looks to me
> like all the right modules are there. Pruned output of 'lsmod':
>
> ide-probe 6608 0 (autoclean)
> ide-cd 24192 0
> ide-disk 6224 0
> ide-scsi 7424 0
> sg 15648 0 (unused)
> cdrom 27168 0 [ide-cd]
> ide-mod 36160 0 (autoclean) [ide-probe ide-cd ide-disk
> ide-scsi]
> isofs 16864 0 (autoclean) (unused)
>
> So what might be missing from that list? The CD that's in it has not
> moved from the tray since the last runtime, during which it was mounted
> and accessible.
>
> Here's an excerpt from dmesg:
>
> PCI_IDE: unknown IDE controller on PCI bus 00 device 79, VID=1166,
> DID=0211
> PCI_IDE: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:pio
> ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:pio, hdd:pio
> hda: PLEXTOR CD-R PX-W1210A, ATAPI CDROM drive
> hdc: IRQ probe failed (0)
> hdc: IRQ probe failed (0)
> hdd: IRQ probe failed (0)
> hdd: IRQ probe failed (0)
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> hda: ATAPI 32X CD-ROM CD-R/RW drive, 2048kB Cache
> Uniform CD-ROM driver Revision: 3.11
>
> ...all looks good to me...
>
> I'm stumped.
>
> Might the device naming have changed when I enabled SCSI emulation?
>
> I do have this in lilo.conf:
>
> append="hda=ide-scsi"
>
> Anyhow. Thanks for any suggestions, knowing me I'll realize that I've
> done something dumb as soon as I send this. ;)
>
>
When you enabled ide-scsi emulation for hda, the device dor the CD-ROM
changed. It is no longer /dev/hda, it is now /dev/scd0. /dev/cdrom is
not a real device, but a symlink to the device. If you run
"ls -al /dev/cdrom", it will probably show you that is it still a
symlink to /dev/hda. What you need to do is change it so that it points
to /dev/scd0 when you use ide-scsi. Try running
"ln -sf /dev/scd0 /dev/cdrom" and see if that fixes you probem.
Mikkel
--
Do not meddle in the affairs of dragons,
for you are crunchy and taste good with ketchup.
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