Hi Tim, You report that you can boot Xen 4.0 on Xen-unstable but not Xen 4.1 or Xen-unstable on Xen-unstable, right? I suppose the problem is that the l1 Dom0 hangs at boot. Attached patch fixes this problem for me. Please give it a try. Signed-off-by: Christoph Egger -- ---to satisfy European Law for business letters: Advanced Micro Devices GmbH Einsteinring 24, 85689 Dornach b. Muenchen Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632