From 565114c2d0594c10ade3c0ac55de7e66a40710b8 Mon Sep 17 00:00:00 2001
From: Tobias Platen <tplaten@posteo.de>
Date: Wed, 30 Mar 2022 21:27:40 +0200
Subject: [PATCH] add external core option

---
 Makefile |  9 +++++++--
 soc.vhdl | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index a9a008a..509cfdb 100644
--- a/Makefile
+++ b/Makefile
@@ -224,9 +224,14 @@ soc_extra_synth += litedram/extras/litedram-wrapper-l2.vhdl \
 soc_extra_v += litedram/generated/$(litedram_target)/litedram_core.v
 endif
 
-GHDL_IMAGE_GENERICS=-gMEMORY_SIZE=$(MEMORY_SIZE) -gRAM_INIT_FILE=$(RAM_INIT_FILE) \
+ GHDL_IMAGE_GENERICS=-gMEMORY_SIZE=$(MEMORY_SIZE) -gRAM_INIT_FILE=$(RAM_INIT_FILE) \
 	-gRESET_LOW=$(RESET_LOW) -gCLK_INPUT=$(CLK_INPUT) -gCLK_FREQUENCY=$(CLK_FREQUENCY) -gICACHE_NUM_LINES=$(ICACHE_NUM_LINES) \
-	$(LITEDRAM_GHDL_ARG)
+	$(LITEDRAM_GHDL_ARG) -gEXTERNAL_CORE=$(EXTERNAL_CORE)
+	
+#GHDL_IMAGE_GENERICS=-gMEMORY_SIZE=$(MEMORY_SIZE) -gRAM_INIT_FILE=$(RAM_INIT_FILE) \
+#	-gRESET_LOW=$(RESET_LOW) -gCLK_INPUT=$(CLK_INPUT) -gCLK_FREQUENCY=$(CLK_FREQUENCY) \
+#	-gSIM_MAIN_BRAM=$(SIM_MAIN_BRAM) -gSIM_BRAM_CHAINBOOT=$(SIM_BRAM_CHAINBOOT) ...
+	
 
 
 ifeq ($(FPGA_TARGET), verilator)
diff --git a/soc.vhdl b/soc.vhdl
index fd059b9..77d6456 100644
--- a/soc.vhdl
+++ b/soc.vhdl
@@ -400,6 +400,7 @@ begin
     end process;
 
     -- Processor core
+    processor_internal: if not EXTERNAL_CORE generate --UNTESTED --LZ@PLATEN
     processor: entity work.core
 	generic map(
 	    SIM => SIM,
@@ -432,8 +433,39 @@ begin
 	    dmi_wr => dmi_wr,
 	    dmi_ack => dmi_core_ack,
 	    dmi_req => dmi_core_req,
-	    ext_irq => core_ext_irq
+	    ext_irq => core_ext_irq, --LZ
+	    nia_req           => nia_req,
+        nia               => nia,
+        msr_o             => msr_o,
+        insn              => insn,
+        ldst_req          => ldst_req,
+        ldst_addr         => ldst_addr
 	    );
+    end generate;
+
+    processor_external: if EXTERNAL_CORE generate
+	processor: external_core_top
+	port map(
+	    clk => system_clk,
+	    rst => rst_core,
+	    alt_reset => alt_reset_d,
+	    wishbone_insn_in => wishbone_icore_in,
+	    wishbone_insn_out => wishbone_icore_out,
+	    wishbone_data_in => wishbone_dcore_in,
+	    wishbone_data_out => wishbone_dcore_out,
+	    dmi_addr => dmi_addr(3 downto 0),
+	    dmi_dout => dmi_core_dout,
+	    dmi_din => dmi_dout,
+	    dmi_wr => dmi_wr,
+	    dmi_ack => dmi_core_ack,
+	    dmi_req => dmi_core_req,
+	    ext_irq => core_ext_irq,
+        nia_req           => nia_req,
+        nia               => nia,
+        msr_o             => msr_o,
+        insn              => insn
+	    );
+    end generate;
 
     -- Wishbone bus master arbiter & mux
     wb_masters_out <= (0 => wishbone_dcore_out,
-- 
2.30.2