diff --git a/ubirmingham.json b/ubirmingham.json
index c3d89e1..9c3f7ad 100644
--- a/ubirmingham.json
+++ b/ubirmingham.json
@@ -3,6 +3,8 @@
     "variant": "ubirmingham",
     "hw_rev": "v1.1",
     "base": "standalone",
+    "ext_ref_frequency": 100e6,
+    "core_addr": "10.0.16.130",
     "peripherals": [
         {
             "type": "dio",