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DRAM loading in Verilator #392

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DRAM loading in Verilator #392

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2fe8b16
hw: verilator: register DRAM memory area for loading on commandline
ziuziakowska Mar 31, 2026
9affb1c
sw: util: make verilator runner passthrough arguments
ziuziakowska Apr 2, 2026
1962f9a
sw: build with code model `medany`
ziuziakowska Apr 2, 2026
883609a
sw: tests: add Verilator DRAM loading test
ziuziakowska Apr 2, 2026
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18 changes: 12 additions & 6 deletions hw/top_chip/dv/verilator/top_chip_verilator.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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;
Expand Down Expand Up @@ -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",
2 * 1024 * 1024 // = 2 GiB
);

return mocha_sim.Main(argc, argv);
Expand Down