problems with kernel 2.6.12

**lin_world** · 08-05-2005

I'd installed and compiled the Kernel 2.6.12... but when i boot it, i got this error message:

Code:

VFS&#58; Cannot open root device "hda6" or unknown-block&#40;0,0&#41;
Please append a correct "root=" boot option
Kernel panic - not syncing&#58; VFS&#58; Unable to mount root fs on unknown-block&#40;0,0&#41;

what should i do??? what is this error for??

oz · 08-05-2005

Looks like a possible problem with the bootloader. If you can post the contents of your /grub/menu.lst file, maybe someone can help you.

**valan** · 08-05-2005

Originally Posted by Ozar

/grub/menu.lst file

/boot/grub/menu.lst

**St. Joe** · 08-06-2005

If you're sure you compiled support for the root file-system then as mentioned post your menu.lst and it would also be helpful to provide your partition scheme.

Code:

$ su
# fdisk -l

**lin_world** · 08-06-2005

this is my menu.lst:

Code:

title           Debian GNU/Linux, kernel 2.6.12
root            &#40;hd0,4&#41;
kernel          /vmlinuz-2.6.12 root=/dev/hda6 ro
savedefault
boot

title           Debian GNU/Linux, kernel 2.6.12 &#40;recovery mode&#41;
root            &#40;hd0,4&#41;
kernel          /vmlinuz-2.6.12 root=/dev/hda6 ro single
savedefault
boot

title           Debian GNU/Linux, kernel 2.4.27-2-386
root            &#40;hd0,4&#41;
kernel          /vmlinuz-2.4.27-2-386 root=/dev/hda6 ro
initrd          /initrd.img-2.4.27-2-386
savedefault
boot

title           Debian GNU/Linux, kernel 2.4.27-2-386 &#40;recovery mode&#41;
root            &#40;hd0,4&#41;
kernel          /vmlinuz-2.4.27-2-386 root=/dev/hda6 ro single
initrd          /initrd.img-2.4.27-2-386
savedefault
boot

and this is my partition table scheme:

Code:

Disk /dev/hda&#58; 81.9 GB, 81961123328 bytes
255 heads, 63 sectors/track, 9964 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1               1        9964    80035798+   5  Extended
/dev/hda5   *           1         486     3903732   83  Linux
/dev/hda6             487        1702     9767488+  83  Linux
/dev/hda7            1703        2918     9767488+  83  Linux
/dev/hda8            2919        3647     5855661   83  Linux
/dev/hda9            3648        4620     7815591   83  Linux
/dev/hda10           4621        5593     7815591   83  Linux
/dev/hda11           5594        6566     7815591   83  Linux
/dev/hda12           6567        7539     7815591   83  Linux
/dev/hda13           7540        7685     1172713+  82  Linux swap / Solaris
/dev/hda14           7686        9964    18306036   83  Linux

how i can compile the support for root file-system ??? and also what is root file system??

**lin_world** · 08-06-2005

HEY... WHAT SHOULD I DO???

**St. Joe** · 08-06-2005

Originally Posted by lin_world

HEY... WHAT SHOULD I DO???

Please be a little discrete. I just woke up.

The problem would appear to be that you don't have the correct kernel and initrd.img file names listed in your menu.lst. I could make a guess at what they should be, but instead please just post the contents of the following directoy: /boot.

To do this open a terminal and issue the command below.
Then copy/paste the output.

$ ls /boot

Also, where is your Debian installation?
Is the root directory on hda5?

Do you have a separate partition for your /boot path?

At present you have it setup in the menu.lst that:
root is on hda5 and /boot is on hda6

Is this correct?

**lin_world** · 08-07-2005

this is my /boot directory:

Code:

config-2.4.27-2-386      initrd.img-2.4.27-2-386.orig  vmlinuz-2.4.27-2-386
config-2.6.12            lost+found                    vmlinuz-2.6.12
grub                     System.map-2.4.27-2-386
initrd.img-2.4.27-2-386  System.map-2.6.12

and you r right : hda5 is my root directory and hda6 is my boot directory...

**St. Joe** · 08-07-2005

Originally Posted by lin_world

this is my /boot directory:

Code:

config-2.4.27-2-386      initrd.img-2.4.27-2-386.orig  vmlinuz-2.4.27-2-386
config-2.6.12            lost+found                    vmlinuz-2.6.12
grub                     System.map-2.4.27-2-386
initrd.img-2.4.27-2-386  System.map-2.6.12

and you r right : hda5 is my root directory and hda6 is my boot directory...

If hda5 is root and hda6 is /boot then you need the setup below.

The line 'root (hd0,x)' refers to the /boot partition
The portion 'root=/dev/hdax' refers to the root partition.

(hd0,1) = hda2; (hd0,2) = hda3; (hd0,3) = hda4; and so forth.

You also didn't create a initrd.img for the 2.6 kernel.
This may or may not be necessary depending on you methods.

Code:

title           Debian GNU/Linux, kernel 2.6.12 
root            &#40;hd0,5&#41; 
kernel          /vmlinuz-2.6.12 root=/dev/hda5 ro 
savedefault 
boot 

title           Debian GNU/Linux, kernel 2.6.12 &#40;recovery mode&#41; 
root            &#40;hd0,5&#41; 
kernel          /vmlinuz-2.6.12 root=/dev/hda5 ro single 
savedefault 
boot 

title           Debian GNU/Linux, kernel 2.4.27-2-386 
root            &#40;hd0,5&#41; 
kernel          /vmlinuz-2.4.27-2-386 root=/dev/hda5 ro 
initrd          /initrd.img-2.4.27-2-386 
savedefault 
boot 

title           Debian GNU/Linux, kernel 2.4.27-2-386 &#40;recovery mode&#41; 
root            &#40;hd0,5&#41; 
kernel          /vmlinuz-2.4.27-2-386 root=/dev/hda5 ro single 
initrd          /initrd.img-2.4.27-2-386 
savedefault 
boot

**lin_world** · 08-08-2005

thanks St. Joe,
but i got a mistake here: hda6 is root and hda5 is /boot ...
another question, how i can make initrd.img and is it really necessary, and alsoo what does this initrd.img do????
thanks again

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