link unused signals to undefined

to stop them appearing in LPF constraints

diff --git a/Makefile b/Makefile
index 8af9442bcf58493cf178d7f4bb57364e64ce661e..c6e31d483f3a855c6d93602decff76d0ddef2d02 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -236,7 +236,7 @@ microwatt.json: $(synth_files) $(RAM_INIT_FILE)
                "ghdl --std=08 --no-formal $(GHDL_IMAGE_GENERICS) \
                $(GHDL_TARGET_GENERICS) $(synth_files) -e toplevel; \
                read_verilog $(uart_files) $(soc_extra_v); \
-               synth_ecp5 -nowidelut -json $@  $(SYNTH_ECP5_FLAGS)"
+               synth_ecp5 -top toplevel -nowidelut -json $@  $(SYNTH_ECP5_FLAGS)"
 
 microwatt.v: $(synth_files) $(RAM_INIT_FILE)
        $(YOSYS) -m $(GHDLSYNTH) -p "ghdl --std=08 --no-formal $(GHDL_IMAGE_GENERICS) $(GHDL_TARGET_GENERICS) $(synth_files) -e toplevel; write_verilog $@"

diff --git a/fpga/top-ulx3s.vhdl b/fpga/top-ulx3s.vhdl
index ceecd43062e46bb39b75e3266d8f8fa4235822ef..43fbd0d4df4bb6f8845cdc771ba802a52bf1740a 100644 (file)
--- a/fpga/top-ulx3s.vhdl
+++ b/fpga/top-ulx3s.vhdl
@@ -44,20 +44,20 @@ architecture behaviour of toplevel is
     signal system_clk_locked : std_ulogic;
 
     -- BRAM verilator access
-       signal no_bram_we : std_ulogic;
-       signal no_bram_re : std_ulogic;
-    signal no_bram_addr : std_logic_vector(log2ceil(MEMORY_SIZE) - 3- 1 downto 0);
-    signal no_bram_di   : std_logic_vector(63 downto 0);
-    signal no_bram_do   : std_logic_vector(63 downto 0);
-    signal no_bram_sel  : std_logic_vector(7 downto 0);
+       signal no_bram_we : std_ulogic := 'U';
+       signal no_bram_re : std_ulogic := 'U';
+    signal no_bram_addr : std_logic_vector(log2ceil(MEMORY_SIZE) - 3- 1 downto 0) := (others => 'U');
+    signal no_bram_di   : std_logic_vector(63 downto 0) := (others => 'U');
+    signal no_bram_do   : std_logic_vector(63 downto 0) := (others => 'U');
+    signal no_bram_sel  : std_logic_vector(7 downto 0) := (others => 'U');
 
     -- for verilator debugging
-    signal no_nia_req: std_ulogic;
-    signal no_nia: std_ulogic_vector(63 downto 0);
-    signal no_msr_o: std_ulogic_vector(63 downto 0);
-    signal no_insn: std_ulogic_vector(31 downto 0);
-        signal no_ldst_req: std_ulogic;
-        signal no_ldst_addr: std_ulogic_vector(63 downto 0);
+    signal no_nia_req: std_ulogic := 'U';
+    signal no_nia: std_ulogic_vector(63 downto 0) := (others => 'U');
+    signal no_msr_o: std_ulogic_vector(63 downto 0) := (others => 'U');
+    signal no_insn: std_ulogic_vector(31 downto 0) := (others => 'U');
+        signal no_ldst_req: std_ulogic := 'U';
+        signal no_ldst_addr: std_ulogic_vector(63 downto 0) := (others => 'U');
 
 begin
 

diff --git a/soc.vhdl b/soc.vhdl
index c3f6a9c8b37cc9f98e14754242c2476704b8b4fa..b02fe12c6b9d2120c759c6bb3886bb8d6ad917ee 100644 (file)
--- a/soc.vhdl
+++ b/soc.vhdl
@@ -268,21 +268,21 @@ architecture behaviour of soc is
 
         wishbone_data_in  : in wishbone_slave_out;
         wishbone_data_out : out wishbone_master_out;
-        dmi_addr    : in std_ulogic_vector(3 downto 0);
-        dmi_din         : in std_ulogic_vector(63 downto 0);
-        dmi_dout    : out std_ulogic_vector(63 downto 0);
-        dmi_req         : in std_ulogic;
-        dmi_wr      : in std_ulogic;
-        dmi_ack         : out std_ulogic;
+        dmi_addr    : in std_ulogic_vector(3 downto 0) := (others => 'U');
+        dmi_din         : in std_ulogic_vector(63 downto 0) := (others => 'U');
+        dmi_dout    : out std_ulogic_vector(63 downto 0) := (others => 'U');
+        dmi_req         : in std_ulogic := 'U';
+        dmi_wr      : in std_ulogic := 'U';
+        dmi_ack         : out std_ulogic := 'U';
         ext_irq     : in std_ulogic;
-        terminated_out   : out std_logic;
+        terminated_out   : out std_logic := 'U';
         -- for verilator debugging
-        nia_req: out std_ulogic;
-        msr_o: out std_ulogic_vector(63 downto 0);
-        nia: out std_ulogic_vector(63 downto 0);
-        insn: out std_ulogic_vector(31 downto 0);
-        ldst_req: out std_ulogic;
-        ldst_addr: out std_ulogic_vector(63 downto 0)
+        nia_req: out std_ulogic := 'U';
+        msr_o: out std_ulogic_vector(63 downto 0) := (others => 'U');
+        nia: out std_ulogic_vector(63 downto 0) := (others => 'U');
+        insn: out std_ulogic_vector(31 downto 0) := (others => 'U');
+        ldst_req: out std_ulogic := 'U';
+        ldst_addr: out std_ulogic_vector(63 downto 0) := (others => 'U')
         );
     end component;
 begin