As this test shows:

https://jenkins.opendaylight.org/releng/view/openflowplugin/job/openflowplugin-csit-1node-flow-services-lithium-redesign-only-beryllium/

OF1.0 switches connecting to controller do not get into inventory. This is seen in karaf log:

2016-02-11 12:47:34,233 | INFO | entLoopGroup-5-4 | ConnectionAdapterImpl | 177 - org.opendaylight.openflowjava.openflow-protocol-impl - 0.7.0.SNAPSHOT | Hello received / branch
2016-02-11 12:47:34,243 | WARN | entLoopGroup-5-4 | nflowProtocolListenerInitialImpl | 181 - org.opendaylight.openflowplugin.impl - 0.2.0.SNAPSHOT | NOOP: Error message received during handshake phase: ErrorMessage [_code=1, _codeString=BADTYPE, _data=[1, 0, 0, 8, 0, 0, 0, 2], _type=1, _typeString=BADREQUEST, _version=1, _xid=2, augmentation=[]]
2016-02-11 12:47:34,251 | INFO | entLoopGroup-5-4 | DeviceManagerImpl | 181 - org.opendaylight.openflowplugin.impl - 0.2.0.SNAPSHOT | Initializing New Connection DeviceContext for node:Uri [_value=openflow:1]
2016-02-11 12:47:34,252 | INFO | entLoopGroup-5-4 | StatisticsManagerImpl | 181 - org.opendaylight.openflowplugin.impl - 0.2.0.SNAPSHOT | Starting Statistics for master role for node:Uri [_value=openflow:1]
2016-02-11 12:47:34,252 | INFO | entLoopGroup-5-4 | RpcManagerImpl | 181 - org.opendaylight.openflowplugin.impl - 0.2.0.SNAPSHOT | Registering Openflow RPCs for node:Uri [_value=openflow:1], role:null

I do not think this is a blocaker since this plugin is not consumed by any project, however this is a relevant limitation we should release note it.