Index: firmware/App/Modes/ModeInitPOST.c
===================================================================
diff -u -r8910c1a21976afcc84fe1d9504916efbc192325d -rcee800793b514f2fccd3776386b6cca41c6340ca
--- firmware/App/Modes/ModeInitPOST.c	(.../ModeInitPOST.c)	(revision 8910c1a21976afcc84fe1d9504916efbc192325d)
+++ firmware/App/Modes/ModeInitPOST.c	(.../ModeInitPOST.c)	(revision cee800793b514f2fccd3776386b6cca41c6340ca)
@@ -19,6 +19,7 @@
 #include "AlarmLamp.h"
 #include "BloodFlow.h"
 #include "Buttons.h"
+#include "Compatibility.h"
 #include "CPLD.h"
 #include "DialInFlow.h"
 #include "FPGA.h"
@@ -101,7 +102,7 @@
     switch ( postState )
     {
         case POST_STATE_START:
-            postState = POST_STATE_WATCHDOG;
+            postState = POST_STATE_FW_COMPATIBILITY;
 #ifdef SKIP_POST
             postState = POST_STATE_COMPLETED;
 #endif
@@ -165,6 +166,11 @@
             postState = handlePOSTStatus( testStatus );
             break;
 
+        case POST_STATE_FW_COMPATIBILITY:
+            testStatus = execFWCompatibilityTest();
+            postState = handlePOSTStatus( testStatus );
+            break;
+
         // Should be last POST
         case POST_STATE_STUCK_BUTTON:
             testStatus = execStuckButtonTest();
@@ -261,8 +267,9 @@
     }
     else if ( testStatus == SELF_TEST_STATUS_FAILED )
     {
-        requestAlarmLampPattern( LAMP_PATTERN_FAULT );
+        // At least one POST has failed
         tempPOSTPassed = FALSE;
+        // Test that failed should have triggered a fault which will request fault mode, so should POST state machine should never see FAILED state and will fault if it does
         result = POST_STATE_FAILED;
     }
     else
@@ -272,3 +279,19 @@
 
     return result;
 }
+
+/*********************************************************************//**
+ * @brief
+ * The execFWCompatibilityTest function executes the firmware compatibility test.
+ * @details Inputs: watchdogSelfTestState
+ * @details Outputs: watchdogSelfTestState
+ * @return in progress, passed, or failed
+ *************************************************************************/
+static SELF_TEST_STATUS_T execFWCompatibilityTest( void )
+{
+    SELF_TEST_STATUS_T result = SELF_TEST_STATUS_PASSED;
+
+    // TODO - implement
+
+    return result;
+}
Index: firmware/App/Services/FPGA.c
===================================================================
diff -u -r794f0aea88a5a860448e54e99db6e2e881b22900 -rcee800793b514f2fccd3776386b6cca41c6340ca
--- firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision 794f0aea88a5a860448e54e99db6e2e881b22900)
+++ firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision cee800793b514f2fccd3776386b6cca41c6340ca)
@@ -20,8 +20,9 @@
 #include "sci.h"
 #include "sys_dma.h"
 
-#include "FPGA.h"
 #include "Comm.h"
+#include "Compatibility.h"
+#include "FPGA.h"
 #include "SystemCommMessages.h"
 #include "Utilities.h"
 
@@ -864,12 +865,28 @@
     // Check FPGA reported correct ID
     if ( FPGA_EXPECTED_ID == fpgaHeader.fpgaId )
     {
-        result = SELF_TEST_STATUS_PASSED;
+        // Check FPGA compatibility w/ firmware
+        if ( fpgaHeader.fpgaRevMajor > MIN_HD_FPGA_MAJOR )
+        {
+            result = SELF_TEST_STATUS_PASSED;
+        }
+        else
+        {
+            if ( MIN_HD_FPGA_MAJOR == fpgaHeader.fpgaRevMajor && fpgaHeader.fpgaRev >= MIN_HD_FPGA_MINOR )
+            {
+                result = SELF_TEST_STATUS_PASSED;
+            }
+            else
+            {
+                result = SELF_TEST_STATUS_FAILED;
+                SET_ALARM_WITH_2_U32_DATA( ALARM_ID_HD_FPGA_POST_TEST_FAILED, (U32)fpgaHeader.fpgaRevMajor, (U32)fpgaHeader.fpgaRev )
+            }
+        }
     }
     else
     {
         result = SELF_TEST_STATUS_FAILED;
-        SET_ALARM_WITH_1_U32_DATA( ALARM_ID_FPGA_POST_TEST_FAILED, (U32)fpgaHeader.fpgaId )
+        SET_ALARM_WITH_1_U32_DATA( ALARM_ID_HD_FPGA_POST_TEST_FAILED, (U32)fpgaHeader.fpgaId )
     }
 
     return result;