Default PMBUS_ALERT ;= '0' to allow not connected.

boards/uniboard2/designs/unb2_minimal/src/vhdl/unb2_minimal.vhd

@@ -60,7 +60,7 @@ ENTITY unb2_minimal IS
 
     PMBUS_SC     : INOUT STD_LOGIC;
     PMBUS_SD     : INOUT STD_LOGIC;
-    PMBUS_ALERT  : IN    STD_LOGIC;
+    PMBUS_ALERT  : IN    STD_LOGIC := '0';
   
     -- 1GbE Control Interface
     ETH_CLK      : IN    STD_LOGIC;