Add --debug-sba option

This lets the user control whether the system bus access implements bus
mastering.

1 files changed, 6 insertions, 1 deletions

diff --git a/spike_main/spike.cc b/spike_main/spike.cc
index d3caa22..f77d488 100644
--- a/spike_main/spike.cc
+++ b/spike_main/spike.cc
@@ -37,6 +37,8 @@ static void help()
   fprintf(stderr, "  --rbb-port=<port>     Listen on <port> for remote bitbang connection\n");
   fprintf(stderr, "  --dump-dts            Print device tree string and exit\n");
   fprintf(stderr, "  --progsize=<words>    progsize for the debug module [default 2]\n");
+  fprintf(stderr, "  --debug-sba=<bits>    debug bus master supports up to "
+      "<bits> wide accesses [default 0]\n");
   exit(1);
 }
 
@@ -89,6 +91,7 @@ int main(int argc, char** argv)
   uint16_t rbb_port = 0;
   bool use_rbb = false;
   unsigned progsize = 2;
+  unsigned max_bus_master_bits = 0;
   std::vector<int> hartids;
 
   auto const hartids_parser = [&](const char *s) {
@@ -130,6 +133,8 @@ int main(int argc, char** argv)
     }
   });
   parser.option(0, "progsize", 1, [&](const char* s){progsize = atoi(s);});
+  parser.option(0, "debug-sba", 1,
+      [&](const char* s){max_bus_master_bits = atoi(s);});
 
   auto argv1 = parser.parse(argv);
   std::vector<std::string> htif_args(argv1, (const char*const*)argv + argc);
@@ -137,7 +142,7 @@ int main(int argc, char** argv)
     mems = make_mems("2048");
 
   sim_t s(isa, nprocs, halted, start_pc, mems, htif_args, std::move(hartids),
-      progsize);
+      progsize, max_bus_master_bits);
   std::unique_ptr<remote_bitbang_t> remote_bitbang((remote_bitbang_t *) NULL);
   std::unique_ptr<jtag_dtm_t> jtag_dtm(new jtag_dtm_t(&s.debug_module));
   if (use_rbb) {