RE: [Xen-users] Kernel Panic-not syncing VFS: Unable to mount root fs on unknown-block(8, 1)

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Oli Seubert
> Sent: 08 February 2007 21:07
> To: Xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Kernel Panic-not syncing VFS: Unable to 
> mount root fs on unknown-block(8, 1)
> 
> Hi
> 
> I just tried to install Xen (3.0.4) from source.
> The Installation process finished without any errors.
> 
> Then after booting the XEN-Image (without initrd)
> I got a Kernel Panic. My machine said it was unuable to mount 
> root fs from Sda1 or unknown-block(0,0)
> 
> After some research on google, I built the SCSI and SATA 
> drivers in the XEN-kernel

Good. The reiserfs filesystem driver is, however, modules, so you need
an initrd - see below for more info.  Or you could just change reiserfs
to be "y" instead of "m" in the configuration file. 

> 
> and now this kernel Panic occurs:
> Kernel Panic-not syncing VFS: Unable to mount root fs on 
> unknown-block(8,1)
> 
> After that
> I have tried to create an initrd as suggested in 
> http://www.linuxfromscratch.org/hints/downloads/files/initrd.txt
> Unfortenetely I wasn't able to compile busybox, so I skipped it

You should be able to just use "mkinitrd /boot/somename.img
kernel-versin", such as "mkinitrd /boot/initrd-2.6.18-xen 2.6.18-xen" -
although different distros have different versions of mkinitrd - the
above works for sure on Fedora Core 4. Most distributions come with some
tool to build a initrd without any "manual" work needed. Make sure you
do "depmod 2.6.18-xen" before you use the mkinitrd command (and that
you've installed your modules in the first place, of course). 

[snip]

--
Mats



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