Xen users - Feb 2009 - dom0 freeze on boot with Tyan 2912 w Barcelona 2347HE

Been picking brains on IRC for a few days, but we still don''t have this
one figured out.

The boot setup that I''m using on a ASUS board with a Phenom processor 
works perfectly. I take that same configuration and try to boot this 
Tyan/Barcelona setup and it freezes when grub (or pxe/isolinux ) passes 
control to the hypervisor. http://www.gaealink.net/not-very-xen.png

We''ve tried vga=keep, vga=ask. I''ve configured a serial
console (tested
to work) with no output. I''ve tried 3.3.0 (gitco) and 3.3.1 both with 
and without "debug ?= y".

I can, however, boot a non-xen configuration and can even kexec xen and 
get it to boot.

Since it freezes immediately with no output at all, I''m not sure how to
diagnose this further.

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