Xen not booting in Unstable

[Russell Coker <russell@coker.com.au>]

I have tried to run three systems with the new Xen kernel from Unstable and 
the xen-hypervisor-3.4-i386 from Testing.  One of them is working reasonably 
well.  The other two just reboot shortly after loading the Xen kernel (long 
before it gets anywhere near mounting the root filesystem).

Broken system A displays something briefly on screen before rebooting.  Broken 
system B just goes black and reboots.  System A is using the old version of 
GRUB as is the working Xen server.  System B is using the new version of GRUB 
(it's a fresh install of Testing) with the "multiboot" option to load the Xen 
kernel.

So System B's problem could be due to GRUB but System A is happily running the 
Lenny version of Xen and GRUB seems to be working fine.

What is the best way of tracking down Xen fail to boot bugs?

-- 
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