lost cdrom access in new kernel
 

Hello everyone, I've just purchased a IBM T41. I've been using debian for about 8 months now , so i've try to upgrade to the new 2.6.4 kernel. Everything went well except for the cdrom. I know in the new kernel you don't need to do scsi emulation to use it. So i compiled it as a module. I can do a hdparm -i /dev/hdc and get my cdrom info. But when i mount it i get this:

"mount: block device /dev/hdc is write protected, mounting read-only"
"mount: no medium found"

So here some stats:
cdrom model: TOSHIBA DVD-ROM SD-R9012

i'm running grub and not lilo so i'm not sure if there's a spot where i need to remove the scsi emulation line.

can someone help?

I can post my .config file if needed.

this might help my /etc/modules
lsmod give me this
i dont see ide-cd in there, could that be a problem???

what command are you using to mount the drive?

this may be a dumb question, but is there a disc in the drive?

if there is a line along the lines of
in your lilo.conf, then remove it becuase that is the line that specifies the scsi emulation.
However, i suspect it will not be there becuase the ide_scsi module is not loaded (from your lsmod)


if you will not be burning cd's then you probably don't need the ide-cd module either (but i could be mistaken)

i'm using "mount -t iso9660 /dev/hdc /cdrom" to mount my crdom.


I'm not using lilo, i'm using grub so i'm not sure if that will affect me. I would like to eventually burn cd but getting it to read is good too.

well i went to /etc/modutils/ and remove the following line from "idecd_opts"
"options ide-cd ignore=hdc"

then rebooted, mount the cdrom and it work.

Although i'm still getting the "/dev/hdc is write-protected, mounting read-only". It's recognizing that it's an iso cdrom and i cant burn ? I wonder if i insert a blank cdr will it give me the same message?

I should rephraze this: the drive is not a burner, so you probably don't need the ide-cd module :)

ok, with grub i think you just have to remove the 'hdc=ide-scsi' if it exists

look at this:
http://www.pcf.sinica.edu.tw/123/ide-scsi.html

it shows a grub.conf both with and without scsi emulation

Well from what i heard you're suppose to be able to burn without using scsi emulation in new kernel 2.6.


Plus that page info says to append this "options ide-cd ignore=hdd" to the grub menu. I just took that line out.

I guess my cdrom access problem is solved. Next try to burn. I'm sure i'll have more newbies question soon too come.

Thanx for all the help SKEL

no problem.

yup, with the new 2.6 kernels ide-scsi is no longer needed. I think you need to use the ide-cd module though.

i'm a lilo user, but i think all you have to do is add 'hdc=ide-cd' to the line with 'kernel' in your grub.conf file and it will load the ide-cd module.

then if you want to use cdrecord do this:
cdrecord -dev=ATAPI -scanbus and it will give you the info for your drive.

then when you want to burn use:
cdrecord -dev=ATAPI:x,x,x ....

i don't know if you will be using cdrecord or not.

sweet deal, went to my /boot/grub/ folder and edited the menu.lst file.

and added the "hcd=ide-cd" to my kernel line. Now i do a mount /cdrom, it give me no complaint. When i get some times i'll have to try out cd burning. I'll let you know how it goes.