hw: verilator: register DRAM memory area for loading on commandline

Signed-off-by: Alice Ziuziakowska <a.ziuziakowska@lowrisc.org>

Author: ziuziakowska

hw/top_chip/dv/verilator/top_chip_verilator.cc

@@ -12,23 +12,26 @@
 
 class MochaSim {
  public:
-  MochaSim(const char *ram_hier_path, int ram_size_words);
+  MochaSim(const char *sram_hier_path, int sram_size_words,
+           const char *dram_hier_path, int dram_size_words);
   virtual ~MochaSim() {}
   virtual int Main(int argc, char **argv);
 
 
  protected:
   top_chip_verilator _top;
   VerilatorMemUtil _memutil;
-  MemArea _ram;
+  MemArea _sram, _dram;
 
   virtual int Setup(int argc, char **argv, bool &exit_app);
   virtual void Run();
   virtual bool Finish();
 };
 
-MochaSim::MochaSim(const char *ram_hier_path, int ram_size_words)
-    : _ram(ram_hier_path, ram_size_words, 8) {}
+MochaSim::MochaSim(const char *sram_hier_path, int sram_size_words,
+                   const char *dram_hier_path, int dram_size_words)
+    : _sram(sram_hier_path, sram_size_words, 8),
+      _dram(dram_hier_path, dram_size_words, 8) {}
 
 int MochaSim::Main(int argc, char **argv) {
   bool exit_app;
@@ -53,7 +56,8 @@ int MochaSim::Setup(int argc, char **argv, bool &exit_app) {
   simctrl.SetTop(&_top, &_top.clk_i, &_top.rst_ni,
                  VerilatorSimCtrlFlags::ResetPolarityNegative);
 
-  _memutil.RegisterMemoryArea("ram", 0x10000000, &_ram);
+  _memutil.RegisterMemoryArea("sram", 0x10000000, &_sram);
+  _memutil.RegisterMemoryArea("dram", 0x80000000, &_dram);
   simctrl.RegisterExtension(&_memutil);
 
   exit_app = false;
@@ -85,7 +89,9 @@ bool MochaSim::Finish() {
 int main(int argc, char **argv) {
   MochaSim mocha_sim(
       "TOP.top_chip_verilator.u_top_chip_system.u_axi_sram.u_ram",
-      16 * 1024 // 16k 64-bit words = 128 KiB
+      16 * 1024, // 16k 64-bit words = 128 KiB
+      "TOP.top_chip_verilator.u_dram_wrapper.u_ext_mem",
+      16 * 131072 // 131k 64-bit words = 2 GiB
   );
 
   return mocha_sim.Main(argc, argv);