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Re: Problem with compiled kernel 2.6.26fc+ unable to identify cdrom format



It's happenings with all cd, apparently , that same cd  get mounted successfully on other linux machines.

What to do next ..?
--Alok


On 4/13/09, Rick Stevens <ricks nerd com> wrote:
alok pandey wrote:
HI,
Still waiting for response, putting some more information for your better
understanding.

Exact error: in dmesg
scsi 4:0:0:0: Direct-Access Dell Virtual Floppy 123 PQ: 0 ANSI: 0 CCS
scsi 3:0:0:0: CD-ROM Dell Virtual CDROM 123 PQ: 0 ANSI: 0 CCS

If you see this, then the kernel knows about your CD-ROM device.  This
is not a kernel issue.

sd 4:0:0:0: [sdc] Attached SCSI removable disk
 "ISOFS: Unable to identify CD-ROM format"

That's pretty obvious.  The CD isn't burned correctly.

Btw, I can mount ISO image successfully (i.e mount -t iso9660 -o lo
/path/to/image /mount/point), So i am sure FS is well supported.

It is.  This is not a kernel or FS issue, it's a media problem.  The CD you're feeding your machine is NOT an ISO9660 CD.  The ISO image is
fine since you can mount it via loopback, but the CD itself is burned
incorrectly.


Attaching my config files as.
LSPCI.txt :-> output of LSPCI command
image-kernel-smpx86.conf:-> Kernel config paramater
Bootfloppy-kernelXX.conf:->Boot image kernel config

I have compiled the kernel to support cd-rom with my best linux knowledge,
but unfortunately it's not working for me. I am quit sure that my kernel
have all the required option enabled , it seems to me as kernel bug.

You comment/suggestion is needed. Plz help.

Thanks
Alok Pandey

On 4/10/09, alok pandey <alok rhct gmail com> wrote:
HI All,
Recently  I compiled a linux fedora kernel (2.6.27fc_x86_64bit) for stata
support. After successful compilation and installation with new kernel, :-
 --System is not able to mount cdrom.
 --Always generate error, "medium not found"
--dmesg have an  entry some thing like " unable to understand cdrom format"

I don't know what went wrong, but i cross checked my new kernel config and
my new kernel have following support:- (in respect of cdrom)
 --SCSI device drive support [*]
--iso9660 file system support [*]
--ata-ide device support [*]

I am attaching my kernel.conf file as attachment for better understanding.
let me know if some other information is need in order to understand my
issue.

Also,
I am highly confused in selection of modules as static or dynamic. It will
be great help if any one can suggest me the rule/law behind dynamic[M] and
static[*] selection of kernel modules.

*I just need to ask , what if i select all kernel modules as lodable
modules [M] instead of static modules [*] or vice versa !!

Thanks
-A





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Thanks
ALOK PANDEY
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