diff --git a/src/mainboard/google/zork/variants/baseboard/devicetree.cb b/src/mainboard/google/zork/variants/baseboard/devicetree.cb
index 664e379035..18c3783e83 100644
--- a/src/mainboard/google/zork/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/zork/variants/baseboard/devicetree.cb
@@ -187,4 +187,8 @@ chip soc/amd/picasso
 		end
 	end
 
+	device mmio 0xfedca000 off end # UART1
+	device mmio 0xfedce000 off end # UART2
+	device mmio 0xfedcf000 off end # UART3
+
 end	# chip soc/amd/picasso