Arch Linux

Igelmann

Member

Registered: 2010-12-17

Posts: 3

[Solved] Custom Kernel doesnt boot

Hi,
I built a custom kernel as described on this site (with arch build system):
https://wiki.archlinux.org/index.php/Cu … n_with_ABS

When i try to boot, it gives me the following error message:
"unable to determine minor/major number of root device"

in the recovery shell i tryed "ls dev" and it seems like there arent any partitions recognised.
I used the same kernel .config like in my debian system where it works just fine.
On debian i used "mkinitramfs" instead of "mkinitcpio".
But i dont see how that would change anything since I put all the important filesystem- and device drivers in the kernel anyways.

menu.lst: I copyed the entry from the standard arch install and just changed the the filenames in /boot
HOOKS="base udev pata scsi sata filesystems" (also tryed autodetect)
System: Thinkpad T23

The standard arch-kernel works fine and its the same version (2.6.36)

I hope you can help me

Last edited by Igelmann (2010-12-18 22:40:59)

dyscoria

Member

Registered: 2008-01-10

Posts: 1,007

Re: [Solved] Custom Kernel doesnt boot

In menu.lst, in the kernel line how do you specify root=blah? When I built filesystem drivers into the kernel, I had problems when "blah" was UUID instead of /dev/sda*

Last edited by dyscoria (2010-12-17 14:28:08)

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Skyalmian

Member

Registered: 2009-06-28

Posts: 121

Re: [Solved] Custom Kernel doesnt boot

Did you change the highlighted portion to match the Kernel? If it is not changed to match then it will give precisely the error you mentioned.

# (3)
title  Kernel GIT Testing
root   (hd0,0)
kernel /vmlinuz26-git root=/dev/disk/by-uuid/f03753dc-b48e-4796-b86b-970afef7be70 radeon.modeset=1
initrd /kernel26-git.img

Last edited by Skyalmian (2010-12-17 16:19:53)

Igelmann

Member

Registered: 2010-12-17

Posts: 3

Re: [Solved] Custom Kernel doesnt boot

thanks for the answers.
i tryed /dev/sda2 instead of uuid but the result was the same.
My menu.lst should match the kernel in /boot , here it is:

 # (0) Arch Linux
 title  Arch Linux
 root   (hd0,1)
 kernel /vmlinuz26 root=/dev/disk/by-uuid/1b0067cb-809b-4c85-801b-3b03350847ef ro quiet
 initrd /kernel26.img
  
 # (1) Arch Linux
 title  Arch Linux Fallback
 root   (hd0,1)
 kernel /vmlinuz26 root=/dev/disk/by-uuid/1b0067cb-809b-4c85-801b-3b03350847ef ro
 initrd /kernel26-fallback.img
 
 # (0) Arch Linux min
 title  Arch Linux min
 root   (hd0,1)
 kernel /vmlinuz26-min root=/dev/disk/by-uuid/1b0067cb-809b-4c85-801b-3b03350847ef ro quiet
 initrd /kernel26-min.img

$ls /boot/
grub                   kernel26.img               kernel26-min.img  System.map26      vmlinuz26
kernel26-fallback.img  kernel26-min-fallback.img  lost+found        System.map26-min  vmlinuz26-min

seems right to me

Last edited by Igelmann (2010-12-17 17:03:19)

Igelmann

Member

Registered: 2010-12-17

Posts: 3

Re: [Solved] Custom Kernel doesnt boot

I actualy just forgot some kernel device drivers

nspattak

Member

From: Greece

Registered: 2008-05-21

Posts: 22

Re: [Solved] Custom Kernel doesnt boot

would you mind sharing them with us? it might help in the future.