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Linux From Scratch This Forum is for the discussion of LFS.
LFS is a project that provides you with the steps necessary to build your own custom Linux system.

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Old 03-16-2006, 11:12 PM   #1
gbiyer
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Registered: Sep 2003
Location: Bangalore
Distribution: FEDORA CORE 4
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Angry Kernel Panic lfs LFS


I compiled and installed LFS in a seperate partition on my harddisk. I have fedora core & windows xp already installed.
When i chrooted into LFS and used grub to setup boot loader. I could not. it was recognising the partition (hd0,3). I had installed LFS on /dev/hda4.

So i logged out of LFS. Created a record in FEDORA's grub config.

I restared the laptop. It booted into LFS but gave the following error.

KERNEL PANIC - not syncing : VFS : unable to mount root FS on unknown block(3,4).

Please help me.
 
Old 03-17-2006, 12:19 AM   #2
baruah
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Registered: Feb 2006
Distribution: RH9.0, RHEL 4
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Can you post the entries in grub.conf ?

-baruah
 
Old 03-17-2006, 01:55 AM   #3
gbiyer
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Location: Bangalore
Distribution: FEDORA CORE 4
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Grub Configuration on Fedora Core 4

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,1)
# kernel /boot/vmlinuz-version ro root=/dev/hda2
# initrd /boot/initrd-version.img
#boot=/dev/hda
default=0
timeout=5
# Use prettier colors.
color green/black light-green/black
splashimage=(hd0,1)/boot/grub/splash.xpm.gz
hiddenmenu
title Fedora Core (2.6.11-1.1369_FC4)
root (hd0,1)
kernel /boot/vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/1 rhgb quiet
initrd /boot/initrd-2.6.11-1.1369_FC4.img

title LFS 6.1.1
root (hd0,3)
kernel /boot/lfskernel-2.6.11.12 root=/dev/hda4

title Windows XP
rootnoverify (hd0,0)
chainloader +1
 
Old 03-29-2006, 02:02 AM   #4
space203
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Registered: Feb 2006
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Did you compile ext2 support into the kernel?
 
Old 04-02-2006, 03:18 AM   #5
gbiyer
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Registered: Sep 2003
Location: Bangalore
Distribution: FEDORA CORE 4
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Yes, Infact i compiled support for all available types ... ext2,ext3 etc.
 
Old 04-24-2006, 11:08 PM   #6
thloh85
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Registered: Apr 2006
Location: Earth
Distribution: BLFS customized
Posts: 160

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I had the same problem as you do...
If i am not mistaken... You did not copy the System.map and the .config files to the /boot...
Try that...
Hope that helps...
 
Old 05-05-2006, 08:44 PM   #7
G3nN00b
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Registered: May 2006
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Question Unable to mount root fs on unknown block (3,4)

I am faced with a similar situation, dual booting a HP pavillion laptop and getting a kernel panic.

Unable to mount root fs on unknown block (3,4)

Not sure what I am missing in the kernal. Drive and files system that I'm using are compiled in the kernel. I believe this is typically what causes an error message like this. Correct me if I am wrong.

What info do you need to help?


/boot/grub/grub.conf

default 0
timeout 30

title=gentoo linux 2.6.16-r6
root (hd0,3)
kernel /boot/linux-2.6.16-r6 root=/dev/hda4

title=windows xp
rootnoverify (hd0,0)
makeactive
chainloader +1


partition layout

windows /dev/hda1
linux /boot /dev/hda2
linux swap /dev/hda3
linux / /dev/hda4
 
Old 05-05-2006, 08:45 PM   #8
G3nN00b
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Where and how would I copy the system.map .config files ?
 
Old 05-07-2006, 03:48 AM   #9
thloh85
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Registered: Apr 2006
Location: Earth
Distribution: BLFS customized
Posts: 160

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Quote:
Originally Posted by G3nN00b
Where and how would I copy the system.map .config files ?
after compiling the kernel (don't just compile bare kernel, use make all) it is at the dir where you build your kernel...
 
  


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