ROM drives not working.

[rrfish72]

After doing a kernel upgrade to 2.6.10-4, my cdrom and dvd drive do not show up any more and I cannot use them. At least not in the info center or dmesg. They use to show up as scsi0-->cdrom and scsi1-->dvd, now my external zip drive shows up as scsi1. I tried to symlink them with ln -sf /dev/scd# /dev/my device, but that did not seem to work, and why would it if the computer does not see them. So how do I go about getting them recognized as scsi drives again? I edited menu.lst and added the hda=scsi....and that had no effect on it. This is the error I get when trying to mount either drive:

Could not mount device.
The reported error was:
mount: /dev/dvd is not a valid block device

During boot I see that the drives now show up as hdc and hdd. Should I change the fstab to reflect this? How do I change the entry if that is what I do? I didn't do anything else but upgrade the kernel. I would like to avoid doing a reinstall. Please help.

[Markus]

Find them in dmesg with:
markus@fujibox:~$ dmesg |grep CD
hdc: TDK CDRW241040B, ATAPI CD/DVD-ROM drive
hdd: LG DVD-ROM DRD-8160B, ATAPI CD/DVD-ROM drive
hdc: ATAPI 40X CD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20

And set up fstab correspondingly:
/dev/cdrom /cdrom iso9660 defaults,ro,users,noexec,noauto 0 0
/dev/dvd /dvd iso9660 defaults,ro,users,noexec,noauto 0 0

Correct symlinks with "ln -s /dev/cdrom /dev/hdc"
Set permissions: chgrp cdrom /dev/cdrom /dev/hdc
markus@fujibox:~$ ll /dev/cdrom /dev/dvd
lrwxrwxrwx 1 root cdrom 8 Sep 21 23:06 /dev/cdrom -> /dev/hdc
lrwxrwxrwx 1 root cdrom 8 Sep 21 23:07 /dev/dvd -> /dev/hdd

[rrfish72]

Looks like its not finding a driver:

root@rrfish72:~# dmesg |grep CD
hdc: Hewlett-Packard CD-Writer cd16f, ATAPI CD/DVD-ROM drive
hdd: HL-DT-STDVD-ROM GDR8160B, ATAPI CD/DVD-ROM drive
Sony CDU-535: probing base address 340
Did not find a Sony CDU-535 drive
Sony CDU-535: probing base address 340
Did not find a Sony CDU-535 drive
Sony CDU-535: probing base address 340
Did not find a Sony CDU-535 drive
Sony CDU-535: probing base address 340
Did not find a Sony CDU-535 drive
root@rrfish72:~#

Did all and still get:

root@rrfish72:~# ll /dev/cdrom /dev/dvd
lrwxrwxrwx 1 root cdrom 9 Jan 10 13:10 /dev/cdrom -> /dev/scd0
lrwxrwxrwx 1 root root 9 Jan 10 12:28 /dev/dvd -> /dev/scd1

Which is the same as before. I used root@rrfish72:~# ln -sf /dev/cdrom /dev/hdc. I never had to do anything but symlink the drives to get them work before. I found module with modconf and tried to install it but the installation failed. sonycd535 - Sony CDU535 CD-ROM support. The drive is not a sony and never showed up as a sony anything, what the hell happened? I am doing this as root.

[Markus]

Oops, got the symlink order mixed up.

su
rm /dev/cdrom
ln -s /dev/hdc /dev/cdrom
chgrp cdrom /dev/cdrom

As for the Sony driver, I would rather remove it with modconf than try to install it if you don't have the drive.

[rrfish72]

When I try the cdrom:

Could not mount device.
The reported error was:
mount: Too many levels of symbolic links

When I try the dvd:

Could not mount device.
The reported error was:
mount: /dev/dvd is not a valid block device

rfish72@rrfish72:~$ ll /dev/cdrom /dev/dvd
lrwxrwxrwx 1 root cdrom 8 Jan 10 15:06 /dev/cdrom -> /dev/hdc
lrwxrwxrwx 1 root root 8 Jan 10 15:08 /dev/dvd -> /dev/hdd
rrfish72@rrfish72:~$

Why did it change anyway?

[Markus]

Do you have /dev/hdc pointing somewhere or is it just:
markus@fujibox:~$ ll /dev/hdc
brw-rw---- 1 root cdrom 22, 0 Nov 14 2003 /dev/hdc

Something must have changed with your kernel or lilo.conf or menu.lst , that is, you used to have scsi emulation and now you don't.
If you're running kanotix kernel you might want to ask in #kanotix

[rrfish72]

Pointing here:

root@rrfish72:~# ll /dev/hd?
brw-rw---- 1 root disk 3, 0 Dec 10 17:13 /dev/hda
brw-rw---- 1 root cdrom 3, 64 Dec 10 17:13 /dev/hdb
lrwxrwxrwx 1 root cdrom 10 Jan 10 14:39 /dev/hdc -> /dev/cdrom
brw-rw---- 1 root cdrom 22, 64 Dec 10 17:13 /dev/hdd
brw-rw---- 1 root disk 33, 0 Dec 10 17:13 /dev/hde
brw-rw---- 1 root disk 33, 64 Dec 10 17:13 /dev/hdf
brw-rw---- 1 root disk 34, 0 Dec 10 17:13 /dev/hdg
brw-rw---- 1 root disk 34, 64 Dec 10 17:13 /dev/hdh
root@rrfish72:~#


So how is that fixed?

[Markus]

Umm, severin seems to have answered that in kanotix forum:

su
rm /dev/hdc
mknod /dev/hdc b 22 0
chmod +w /dev/hdc
chgrp cdrom /dev/hdc

[rrfish72]

I guess that was it. After updating to the even newest kernel 2.6.10-5 (2 new updates in the same day, 4 and 5) and logged in it then the dvd worked. I will try 4 now and see if it works too. The cdrom still seems to give this message:

Could not mount device.
The reported error was:
mount: Too many levels of symbolic links

[rrfish72]

Thanks for your help Markus. As you probably see from kanotix forum, Kano directed me to the end. Are you maku in kanotix forum?