rtl: fix some warnings

hdl/rtl/hydra_core.vhd

@@ -179,6 +179,7 @@ begin
         reg_dm_data_s <= (others => '0');
         reg_dm_data_select <= (others => '1');
       elsif cpu_rst_n_i = '0' then
+        --  Clear dram.
         if dm_done = '1' then
           reg_dm_addr <= std_logic_vector(unsigned(reg_dm_addr) + 4);
         end if;
@@ -221,6 +222,7 @@ begin
       we_i => iram_we,
       wdata_i => iram_data,
       wforce_i => (others => '0'),
+      wdone_o => open,
 
       ecc_one_o => iram_ecc_err,
       ecc_fatal_o => iram_ecc_fatal,
@@ -290,6 +292,7 @@ begin
         reg_dm_load          <= '0';
         reg_dm_store         <= '0';
       elsif cpu_rst_n_i = '0' then
+        --  Write to dram until the last address.
         reg_dm_store <= not reg_dm_addr(g_DRAM_LOG_SIZE);
       else
         if dm_cycle_in_progress = '0' then
@@ -468,6 +471,7 @@ begin
       reset_cause_ecc_i => reset_cause_ecc,
       reset_cause_watchdog_i => reset_cause_wd,
       cpu_reset_i => cpu_rst,
+      cpu_reset_o => open,
       cpu_recovery_i => cpu_recovery,
       cpu_recovery_o => cpu_recovery_in,
       cpu_wr_o => cpu_wr,

hdl/rtl/hydra_dram.vhd

@@ -154,8 +154,8 @@ begin
   p_ctrl: process (state,
                    p_done, r_done, scrub_done, rerr,
                    rerr_one, rdata_ecc, rsyndrome, last_addr, last_we, last_sel, recc,
-                   en_i, addr_i, we_i, data_i, r_done_d,
-                   scrub_rd, scrub_addr, scrub_done_d, rst_n_i)
+                   en_i, addr_i, we_i, data_i, sel_i, r_done_d,
+                   scrub_rd, scrub_addr, scrub_done_d, cpu_rst_n_i)
   is
     variable d : std_logic_vector(31 downto 0);
   begin

hdl/rtl/hydra_iram.vhd

@@ -168,7 +168,7 @@ begin
 
   p_ctrl: process (state, r1_done, r2_done, rerr, rerr_one, rdata_ecc, rsyndrome, last_raddr, recc,
                    r1_en_i, r1_addr_i, we_i, waddr_i, wdata_i, wforce_i, r1_done_d, r2_done_d,
-                   r2_en_i, r2_addr_i, scrub_rd, scrub_addr, scrub_done, scrub_done_d, rst_n_i)
+                   r2_en_i, r2_addr_i, scrub_rd, scrub_addr, scrub_done, scrub_done_d, cpu_rst_n_i)
   begin
     wen <= '0';
     waddr <= (others => 'X');