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blakdeath
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PostPosted: Tue Mar 12, 2013 5:53 am    Post subject: VFS: Cannot open root device "(null)" or unknown-b Reply with quote

When I try to boot, I get a kernel panic and the error:
VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
when I try to boot into my newly installed gentoo linux

this is my grub.conf:
# This is a sample grub.conf for use with Genkernel, per the Gentoo handbook
# http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=1&chap=10#doc_chap2
# If you are not using Genkernel and you need help creating this file, you
# should consult the handbook. Alternatively, consult the grub.conf.sample that
# is included with the Grub documentation.

default 0
timeout 30
#splashimage=(hd0,0)/boot/grub/splash.xpm.gz

title Gentoo Linux 2.6.24-r5
root (hd0,1)
kernel /boot/kernel1 root=/dev/ram0 real_root=/dev/sda3

title gentoo without params
root (hd0,1)
kernel /boot/kernel1

title windows 7
rootnoverify (hd0,0)
makeactive
chainloader +1

# vim:ft=conf:
______________________________________________________________________________________________________

here's my kernel config file:
http://www.4shared.com/file/ZWNGbJd9/conf.html

I am using /dev/sda2 (ext2) as a boot partition, /dev/sda3 (ext2) as my / partition

my sata controller is:
SATA controller: intel corporation 82001IBM/IEM (ICH9M/ICH9M-E) 4 port Sata controller (AHCI)

I'm not using a ramdisk and I plan not too unless it's really required(which never happens), I'd rather not use genkernel either

any help is appreciated

thanks in advance
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DONAHUE
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Joined: 09 Dec 2006
Posts: 6650
Location: Goose Creek SC

PostPosted: Tue Mar 12, 2013 6:07 am    Post subject: Reply with quote

try
Quote:
default 0
timeout 30
#splashimage=(hd0,0)/boot/grub/splash.xpm.gz

title Gentoo
root (hd0,1)
kernel /boot/kernel1 root=/dev/sda3

title windows 7
rootnoverify (hd0,0)
makeactive
chainloader +1


ls /boot to verify kernel name is kernel1

your config is at a spam site, suggest you use wgetpaste
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s_bernstein
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Joined: 11 Mar 2006
Posts: 172
Location: Bremen, Germany

PostPosted: Tue Mar 12, 2013 6:13 am    Post subject: Re: VFS: Cannot open root device "(null)" or unkno Reply with quote

blakdeath wrote:

title Gentoo Linux 2.6.24-r5
root (hd0,1)
kernel /boot/kernel1 root=/dev/ram0 real_root=/dev/sda3


Your kernel is either missing a initram or you should change the root parameter to you real root device.
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blakdeath
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PostPosted: Tue Mar 12, 2013 12:01 pm    Post subject: Reply with quote

Donahue, that worked like acharm
and thanks alot for the uick reply
bernstiend thanks for ur help but I do not use an initramfs

thanks, problem solved[/bug]
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Newbee 12
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Joined: 31 Oct 2012
Posts: 38
Location: Northwest, USA

PostPosted: Wed Mar 13, 2013 6:01 pm    Post subject: VFS: Cannot open root dev"sda3" or unkown-block(0, Reply with quote

I followed the install manual to the letter: upon reboot i received splash screen selected 1st choice Gentoo Linux 3.7.10

This is my Grub.conf

Quote:
default 0
timeout 30
splashimage=(hd0,0) /boot/grub/splash.xpm.gz
title Gentoo Linux 3.7.10
root (hd0,0)
kernel /boot/kernel-3.7.10-gentoo root=/dev/sda3 video=uvesafb:mtrr:3,ywrap,1024x768-32@60

title Gentoo Linux 3.7.10 (rescue)
root (hd0,0)
kernel /boot/kernel-3.7.10-gentoo root=/dev/sda3 init=/bin/bb

title Gentoo Linux 3.7.10
root (hd0,0)
kernel /boot/3.7.10 real_root=/dev/sda3
initrd /boot/initramfs-genkernal-x86_64-3.7.10-gentoo


I used Genkernel to create kernel and initramfs
checking the kernel and initramfs shows:
Kernel is named /boot/kernel-genkernal-x86_64-3.7.10-gentoo
initramfs is named /boot/initramfs-genkernel-x86_64-3.7.10-gentoo

partitons and fstab are:
/dev/sda1 /boot ext2
/dev/sda2 swap
/dev/sda3 / ext3
/dev/cdrom /mnt/cdrom auto
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DONAHUE
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Joined: 09 Dec 2006
Posts: 6650
Location: Goose Creek SC

PostPosted: Wed Mar 13, 2013 7:47 pm    Post subject: Reply with quote

grub.conf,
Quote:
default 0
timeout 30
#splashimage=(hd0,0) /boot/grub/splash.xpm.gz

title Gentoo Linux 3.7.10
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-3.7.10-gentoo root=/dev/ram0 real_root=/dev/sda3
initrd /boot/initramfs-genkernel-x86_64-3.7.10-gentoo


/etc/fstab:
Quote:
/dev/sda1 /boot ext2 defaults 0 0
/dev/sda2 none swap sw 0 0
/dev/sda3 / ext3 defaults,noatime 0 1

corrects typos
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Newbee 12
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Joined: 31 Oct 2012
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Location: Northwest, USA

PostPosted: Wed Mar 13, 2013 11:11 pm    Post subject: Reply with quote

I will make chages and see if it works will post back with results. Thank you
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Newbee 12
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PostPosted: Wed Mar 13, 2013 11:23 pm    Post subject: Now error 15 File not found Reply with quote

I made recommended changes, re did the grub and added to mbr exited and rebooted and it now gives me an Error 15 .

I will boot to the live cd again and look but i cannot find anything out of the ordinary. going home now!!!
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DONAHUE
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Location: Goose Creek SC

PostPosted: Wed Mar 13, 2013 11:45 pm    Post subject: Reply with quote

For reference, editing grub.conf does not require reinstalling the bootloader in the MBR. This is the major reason for using grub instead of lilo. If you emerge a new version of grub reinstalling to the MBR is recommended.
Boot the cd, mount the gentoo partitions, enter the chroot, nominally:
Code:
mount /dev/sda3 /mnt/gentoo
mount /dev/sda1 /mnt/gentoo/boot
mount -t proc none /mnt/gentoo/proc
mount --rbind /sys /mnt/gentoo/sys
mount --rbind /dev /mnt/gentoo/dev
chroot /mnt/gentoo /bin/bash
source /etc/profile
export PS1="(chroot) $PS1"
Then:
Code:
grub
find /boot/grub/stage1
this will return in the format (hdx,y), substitute for x and y below:
Code:
 root (hdx,y)
The return should show the file system used on /boot partition.
Code:
setup (hdx)
Should show success and sectors embedded.
Code:
quit
exit
cd
umount -l /mnt/gentoo/dev{/shm,/pts,}
umount -l /mnt/gentoo{/boot,/proc,}
reboot
Reboot gentoo
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Newbee 12
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PostPosted: Thu Mar 14, 2013 10:48 pm    Post subject: Reply with quote

This is still not working the Genkernel; Version is 3.4.45 and this is a Dell PoweredgeR610,could this issue be related to some hardware not supported using the genkernel all :?:
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DONAHUE
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Joined: 09 Dec 2006
Posts: 6650
Location: Goose Creek SC

PostPosted: Thu Mar 14, 2013 11:31 pm    Post subject: Reply with quote

No, error 15 is strictly from grub being unable to find a file based on the information in grub.conf. The kernel is not involved. Apparently your BIOS is not seeing the /boot partition as (hd0,0).
boot the minimal install cd or a system rescue cd to a network connection, run
Code:
 fdisk -l | wgetpaste
post the url returned.
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