Re: [Xen-users] Xen boot failed while mount root FS.

[list user <xktnniuymlla@xxxxxxxxxxxxxx>]

Taylor Lee wrote:
> Hi,Guys 
Hello, Taylor Lee,

> I installed Xen3.0.2 on CentOS4.2 platform with xen-3.0.2-src.tgz or
> xen-2.0.7-install-x86_32.tar,but I got below error during boot from Xen
> kernel:
>
> VFS: Cannot open root device "/" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
>
> any idea for this issue,it is really appreciated!
>
> More,grub.conf file :
>
> default=0
> timeout=5
> splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title CentOS-4 i386 (2.6.9-22.ELsmp)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.9-22.ELsmp ro root=LABEL=/ rhgb quiet
>         initrd /initrd-2.6.9-22.ELsmp.img
> title CentOS-4 i386-up (2.6.9-22.EL)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.9-22.EL ro root=LABEL=/ rhgb quiet
>         initrd /initrd-2.6.9-22.EL.img
> title Xen 3.0 / XenLinux 2.6
>         kernel /xen-3.0.gz console=vga
>         module /vmlinuz-2.6-xen root=LABEL=/ ro console=tty0 
I think the problem is here.  The other two boot invocations use an
"initrd" but the Xen invocation doesn't.   Create one and add a line for
it and you should be good to go.

If you built your own xen kernel you will need to resolve its module
dependencies first:

  depmod 2.6.16-xen

Then, assuming you have no special devices or filesystems this should 
make an initrd:
  mkinitrd /boot/initrd-2.6.16-xen.img 2.6.16-xen

Now add the following line to your grub Xen stanza:

        module /initrd-2.6.16-xen.img

Hope that gets you going.

Mike Wright

> Regards
>
> --Taylor
>
>  
>
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