Xen users - Aug 2005 - kernel panic - VFS: Unable to mount root fs on unknown-block(0, 0) -- xen IDE drivers?

I''m trying to install xen-2.0.7-src.tgz from a debian-sarge netinst- 
cd virgin install with one partition (/).  I''m following the  
instructions on http://www.option-c.com/xwiki/Custom_Xen_Kernels

The netinst-cd installs a 2.6.8 kernel. I''m using its config file and  
turning on XeN requirements for domain 0. The kernel builds and  
installs just fine. My grub entry looks like this:
title Debian-sarge 2.6.11 / XeN 2.0.7 (hda9)
root (hd0,8)
kernel /boot/xen.gz dom0_mem=393216 noreboot
module /boot/vmlinuz-2.6.11.12-xen0 root=/dev/hda9 ro console=tty0

It does not matter what I put in the root= line, I always get the  
same message. I think the key is block(0,0). I have no idea why it  
should say that at all.

(BTW, I''ve tried at least a half-dozen ways to get XeN installed on  
this system -- that is why I''m up to hda9. I''ve tried to get
as
simple an install as possible.)


Here''s the bit that I''m a bit nervous about:
My motherboard actually has 2 PATA IDE controllers and 1 SATA  
controller. Initially it took me forever just to get debian to  
install at all because the BIOS saw all the controllers, but the  
debian CD only saw one -- and not the first one at that. I finally  
resolved that with BIOS and never turned on those drivers in any of  
the kernels I built including the XeN ones. I am suspicious though  
that the XeN kernel is somehow picking my other controllers up though  
-- not sure how though given I thought it used domain 0''s drivers.

The other annoying thing is that debian-stable comes with 2.6.8 with  
devfs on. And although I gave up using mkinitrd with XeN (as I was  
trying to eliminate possible issues), debian-sarge insists on using  
devfs even in 2.6.11 if one intendes to use mkinitrd. I image this  
might be a problem at least for the domN kernels? I''m not there yet  
-- just pointing out things I''m seeing. My problem above happens with  
and without devfs compiled into the kernel.

BTW, The democd (2.0.6) works just great in this computer. But I  
can''t figure out how to get that to my computer either.

I''ve seen a few other people complaining of similar issues to mine on  
the lists, but I haven''t seen any answers that worked for me.



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Hi Eric,

Eric Brown schrieb:
> I''m trying to install xen-2.0.7-src.tgz from a debian-sarge
netinst-
> cd virgin install with one partition (/).  I''m following the  
> instructions on http://www.option-c.com/xwiki/Custom_Xen_Kernels
My (at last succesfull) approach was the other way round. I installed 
debian sarge netinst and added the experimental xen debs from 
option-c.com. Then I took a vanilla kernel vom kernel.org, patched it 
with the xen sources and compiled it with the config of option-c.coms 
xen0-kernel plus adding the options I needed for my machine.
To find out which modules my xen-kernel would need I started with the 
debian standard kernel and examined the list lsmod gave me of loaded 
kernel modules. Some of these had to be added to the option-c.com 
kernel-config.

That worked for me.

Dirk

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