diff -r 4448fae52553 tools/python/xen/xend/XendConfig.py
--- a/tools/python/xen/xend/XendConfig.py	Mon Jun 08 12:24:14 2009 +0100
+++ b/tools/python/xen/xend/XendConfig.py	Tue Jun 09 15:31:49 2009 +0900
@@ -1100,12 +1100,11 @@
                             configs = controller.configurations(txn)
                             for config in configs:
                                 if sxp.name(config) in ('vbd', 'tap'):
-                                    # The bootable flag is never written to the
-                                    # store as part of the device config.
                                     dev_uuid = sxp.child_value(config, 'uuid')
                                     dev_type, dev_cfg = self['devices'][dev_uuid]
-                                    is_bootable = dev_cfg.get('bootable', 0)
-                                    config.append(['bootable', int(is_bootable)])
+                                    if sxp.child_value(config, 'bootable', None) is None:
+                                        is_bootable = dev_cfg.get('bootable', 0)
+                                        config.append(['bootable', int(is_bootable)])
                                     config.append(['VDI', dev_cfg.get('VDI', '')])
 
                                 sxpr.append(['device', config])