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ciummo
n00b
Joined: 30 Dec 2009
Posts: 4
Location: Sardinia
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 Posted: Wed Dec 30, 2009 10:49 am Post subject: Kernel panic, but with genkernel it's all ok (VFS:Unable...) |
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Hi!
I just installed gentoo, and now i'm trying to configure the kernel...
with genkernel it goes all ok, but if i try to change the configuration i get kernel panic
| Quote: | Root - NFS : NO NFS server available, giving up.
VFS : Unable to mount root device "sda11" on unknow-block (2,0)
Please append a correct "root=" boot option; here are the available partitions
Kernel panic - not syncing : VFS : Unable to mount root fs on unknow block (2,0) |
This is my list of disk :
| Code: |
Dispositivo Boot Start End Blocks Id System
/dev/sda1 2 8494 68220022+ f W95 Esteso (LBA)
/dev/sda2 8495 15854 59119200 b W95 FAT32
/dev/sda3 * 15855 30402 116846592 7 HPFS/NTFS
La partizione 3 non termina al limite del cilindro.
/dev/sda5 15 269 2048256 7 HPFS/NTFS
/dev/sda6 * 270 779 4096543+ 7 HPFS/NTFS
/dev/sda7 780 4603 30716248+ 7 HPFS/NTFS
/dev/sda8 4604 5819 9767488+ 83 Linux
/dev/sda9 5820 7035 9767488+ 83 Linux
/dev/sda10 7036 7278 1951866 82 Linux swap / Solaris
/dev/sda11 7279 8494 9767488+ 83 Linux
/dev/sda12 2 14 104359+ 83 Linux
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Where sda12 is the boot partition and sda11 is gentoo ( i've a sata disk ):
| Code: | | 00:09.0 IDE interface: nVidia Corporation MCP67 AHCI Controller (rev a2) |
I've found a similar problem with google... but i'm not able to find the "NVIDIA sata supporting" voice on menuconfig.
Anyway this is my grub.conf
| Code: |
default 0
timeout 10
title Ubuntu, Linux 2.6.31-16-generic
root (hd0,11)
kernel /boot/vmlinuz-2.6.31-16-generic root=UUID=15d861f9-3c66-4cc3-baed-2170d5bc0de6 ro quiet splash
initrd /boot/initrd.img-2.6.31-16-generic
title Gentoo
root (hd0,11)
kernel /boot/kernel-gentoo-2 real_root=/dev/sda11
title Gentoo Linux
root (hd0,11)
kernel /boot/kernel-genkernel-x86-2.6.31-gentoo-r6 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/sda11
initrd /boot/initramfs-genkernel-x86-2.6.31-gentoo-r6 |
Any idea ?
Thanks a lot
Last edited by ciummo on Wed Dec 30, 2009 11:20 am; edited 1 time in total |
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Marq
n00b
Joined: 31 Mar 2009
Posts: 40
Location: Cracow, Poland
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| Posted: Wed Dec 30, 2009 11:18 am Post subject: |
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| If you want to boot new Kernel like generic, you need to build initrd and add initrd line in grub.conf. Read about genkernel and initrd. |
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ciummo
n00b
Joined: 30 Dec 2009
Posts: 4
Location: Sardinia
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| Posted: Wed Dec 30, 2009 11:33 am Post subject: |
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i have a doubt...
once the kernel is configured with genkernel,
if i modify the kernel config with "make menuconfig"
it means i can use the config given by genkernel? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54237
Location: 56N 3W
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| Posted: Wed Dec 30, 2009 11:37 am Post subject: |
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ciummo,
To make a kernel you can boot without an initrd file you need to configure all the things you need to boot as <*>, so they are in the kernel file in /boot.
You must have the drivers for the chip set that controls the hard drive where your root filesystsem is stored.
You must have the driver for the root filesystem itself.
Thats the bare minimum - other things can be modules. Modules are stored in /lib/modules ... which is on the root filesystem, so the kernel can't read an modules until root is mounted. Try one of Pappys Seeds to get you started in rolling your own kernel.
Look for the link in one of Pappys posts
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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ciummo
n00b
Joined: 30 Dec 2009
Posts: 4
Location: Sardinia
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| Posted: Thu Dec 31, 2009 11:43 am Post subject: |
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Thanks a lot, now it's really more clear!
But... i can use the same initrd of genkernel
with my modificated kernel ? |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54237
Location: 56N 3W
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| Posted: Thu Dec 31, 2009 12:31 pm Post subject: |
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ciummo,
Maybe - but only if the kernel is the same (*identical*) version and some key kernel options are not changed.
Its not a good thing to attempt.
With your own kernel, you should not need an initrd file at all as you can make it so that modules are not needed for booting.
genkernel makes a fully modular kernel with almost everything compiled and set to module.
It has to have an initrd to boot.
genkerenel kernel are intended to be generic so they will boot almost anywhere. As a result they are full of modules you will never use and not optimied to your CPU.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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Installing Gentoo
