Connect interrupt request pulse to GN4124 gpio 8.

hdl/gn4124core/gn4124_core.vhd

@@ -320,6 +320,10 @@ begin
       O => rst_n
       );
 
+  ------------------------------------------------------------------------------
+  -- IRQ pulse forward to GN4124 GPIO
+  ------------------------------------------------------------------------------
+  irq_p_o <= irq_p_i;
 
   --============================================================================
   -- P2L DataPath

hdl/gn4124core/lotus.vhd

@@ -283,6 +283,9 @@ architecture BEHAVIOUR of LOTUS is
 
   signal led0 : std_logic_vector(7 downto 0);
 
+  signal irq_sources : std_logic_vector(1 downto 0);
+  signal irq_to_gn4124 : std_logic;
+
 begin
 
   ------------------------------------------------------------------------------
@@ -363,9 +366,9 @@ begin
 
       ---------------------------------------------------------
       -- Interrupt interface
-      dma_irq_o => open,
-      irq_p_i   => '0',
-      irq_p_o   => open,
+      dma_irq_o => irq_sources,
+      irq_p_i   => irq_to_gn4124,
+      irq_p_o   => GPIO(8),
 
       ---------------------------------------------------------
       -- Target Interface (Wishbone master)
@@ -472,6 +475,9 @@ begin
   --    douta => 
   --    );
 
+  -- just forward irq pulses for test
+  irq_to_gn4124 <= irq_sources(1) or irq_sources(0);
+
   LED <= (others => '1');
 
 end BEHAVIOUR;