diff --git a/servo/data/servo_poppy_overlay.xml b/servo/data/servo_poppy_overlay.xml
index b8623b9..4d587c4 100644
--- a/servo/data/servo_poppy_overlay.xml
+++ b/servo/data/servo_poppy_overlay.xml
@@ -39,4 +39,13 @@
     <params subtype="volume_down_gpio" interface="10" drv="ec" map="yesno"
     clobber_ok=""></params>
   </control>
+  <!-- cr50 UART Buffers & VREF Controls -->
+  <control>
+    <name>jtag_vref_sel0</name>
+    <params clobber_ok="" init="pp3300"></params>
+  </control>
+  <control>
+    <name>jtag_vref_sel1</name>
+    <params clobber_ok="" init="pp3300"></params>
+  </control>
 </root>