vfs unable to mount root fs on unknown--block(0,0).

Dear all,

I have rebuild my kernel 2.6.10 inserting some debug messages in the FS
sub-system.
Later when I tried to boot the new kernel image I am failing with
following message.

Kernel panic: VFS: Unable to mount root fs on
unknown--block(0,0)

My kernel build process reported NO error messages.

I have searched the groups for this problem but I did not find any
solution mentioned.

Regards,
Mu7kund Jampala

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Re: vfs unable to mount root fs on unknown--block(0,0).

On Tuesday 09 August 2005 13:59, Mukund JB. wrote:
> Dear all,
>
> I have rebuild my kernel 2.6.10 inserting some debug messages in the FS
> sub-system.
> Later when I tried to boot the new kernel image I am failing with
> following message.
>
> Kernel panic: VFS: Unable to mount root fs on
> unknown--block(0,0)

A quite well known pithole really.

> My kernel build process reported NO error messages.
>
> I have searched the groups for this problem but I did not find any
> solution mentioned.

You seem to have forgotten http://google.com/linux
which give hundreds of hits, i think you should read this one for your answer.

http://www.linuxforums.org/forum/post-256381.html

On another note i typed "fat12" into google as well, there are plenty of
answers there about you digital camera problem as well.


--
Regards Richard.
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RE: vfs unable to mount root fs on unknown--block(0,0).

Dear Robert,

Yes, I think I have seen this and many other mails speaking about this
issue but I am unable to find the solution.
How did they fix it is written or replied no where?

I have tried their suggestion like making EXT, IDE and FAT support
inbuilt to the kernel rather than modules.
Even then the problem persists.

Did you find any one mentioning the solution for this issue?

Also, the group discussion you find when you type "FAT12" in Google is
me myself.

Thanks & regards,
Mukund Jampala

>-----Original Message-----
>From: Richard Adams [mailto:pa3gcu@zeelandnet.nl]
>Sent: Tuesday, August 09, 2005 9:03 PM
>To: Mukund JB.
>Cc: linux-newbie@vger.kernel.org
>Subject: Re: vfs unable to mount root fs on unknown--block(0,0).
>
>On Tuesday 09 August 2005 13:59, Mukund JB. wrote:
>> Dear all,
>>
>> I have rebuild my kernel 2.6.10 inserting some debug messages in the
FS
>> sub-system.
>> Later when I tried to boot the new kernel image I am failing with
>> following message.
>>
>> Kernel panic: VFS: Unable to mount root fs on
>> unknown--block(0,0)
>
>A quite well known pithole really.
>
>> My kernel build process reported NO error messages.
>>
>> I have searched the groups for this problem but I did not find any
>> solution mentioned.
>
>You seem to have forgotten http://google.com/linux
>which give hundreds of hits, i think you should read this one for your
>answer.
>
>http://www.linuxforums.org/forum/post-256381.html
>
>On another note i typed "fat12" into google as well, there are plenty
of
>answers there about you digital camera problem as well.
>
>
>--
>Regards Richard.
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Re: vfs unable to mount root fs on unknown--block(0,0).

On Wednesday 10 August 2005 08:10, Mukund JB. wrote:
> Dear Robert,
>
> Yes, I think I have seen this and many other mails speaking about this
> issue but I am unable to find the solution.
> How did they fix it is written or replied no where?

Most of the mails i have seen simply say what i told you in another mail.

mount -t auto /dev/xxx /mnt/xxx

> I have tried their suggestion like making EXT, IDE and FAT support
> inbuilt to the kernel rather than modules.
> Even then the problem persists.

Modules are fine, most all distribution installed kernels have fat support.

> Did you find any one mentioning the solution for this issue?

Well yes there are plenty of mails explaining the problem and mentioning
different ways of solving it. You may however need to read between the lines.

>
> Also, the group discussion you find when you type "FAT12" in Google is
> me myself.

Not at all, your mails are there but there are hundreds more explaining what
to do.

>
> Thanks & regards,
> Mukund Jampala
>

BTW please read my sig.

--
Regards "RICHARD"

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RE: vfs unable to mount root fs on unknown--block(0,0).

Dear Robert,

>> Yes, I think I have seen this and many other mails speaking about
this
>> issue but I am unable to find the solution.
>> How did they fix it is written or replied no where?
>
>Most of the mails i have seen simply say what i told you in another
mail.
>
>mount -t auto /dev/xxx /mnt/xxx

I have tried it. It fails even then.

I have even tired earlier
#mount -t vfat /dev/xxx /mnt/xxx
FAT: bogus number of reserved sectors
mount: you must specify the filesystem

Please try to see on the FAT sub-system message.
It is here where the problem is really starting.

>> I have tried their suggestion like making EXT, IDE and FAT support
>> inbuilt to the kernel rather than modules.
>> Even then the problem persists.
>
>Modules are fine, most all distribution installed kernels have fat
support.

However, I figured out a rough shout route.
When I made some modifications to the inode.c file in fat sub-system I
found that the .config file generated after make menuconfig has changed.


So, I simply replaced the Original .config file & tried to build. it
worked.
I did NOT understand how it is related? Can you comment on this please?

However, the fat is a module rather than inbuilt & gets loaded
dynamically by registering to the fs layer when such a filesystem is
tired to mount.

>> Did you find any one mentioning the solution for this issue?
>
>Well yes there are plenty of mails explaining the problem and
mentioning
>different ways of solving it. You may however need to read between the
>lines.

I have tried all the ways on mounting it. Added it to fstab
& many more? Then I realized the problem is NOT in mount rather it is
some where else either in FAT, driver?

>> Also, the group discussion you find when you type "FAT12" in Google
is
>> me myself.
>
>Not at all, your mails are there but there are hundreds more explaining
>what
>to do.

OK, let me recheck it today.

Thanks & regards,
Mukund Jampala

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