[bazel] Build non-scrambled VMEM images

The englishbreakfast verilator model does not understand ROM scrambling, so we also create a non-scrambled VMEM file. Signed-off-by: Chris Frantz <[email protected]>
lowRISC · Oct 4, 2023 · ba0a8ad · ba0a8ad
1 parent e686650
commit ba0a8ad
Show file tree

Hide file tree

Showing 2 changed files with 17 additions and 0 deletions.
diff --git a/rules/opentitan/cc.bzl b/rules/opentitan/cc.bzl
@@ -228,6 +228,12 @@ def _opentitan_binary(ctx):
         # the DefaultInfo provider.
         if "logs" in provides:
             default_info.extend(provides["logs"])
+
+        # FIXME(cfrantz): Special case: The englishbreakfast verilator model
+        # requires a non-scrambled ROM image.
+        if provides.get("rom32"):
+            default_info.append(provides["rom32"])
+
         groups.update(_as_group_info(exec_env.exec_env, signed))
         groups.update(_as_group_info(exec_env.exec_env, provides))
 

diff --git a/rules/opentitan/sim_verilator.bzl b/rules/opentitan/sim_verilator.bzl
@@ -47,6 +47,15 @@ def _transform(ctx, exec_env, name, elf, binary, signed_bin, disassembly, mapfil
             rom_scramble_config = exec_env.rom_scramble_config,
             rom_scramble_tool = ctx.executable.rom_scramble_tool,
         )
+
+        # The englishbreakfast verilator model does not understand ROM
+        # scrambling, so we also create a non-scrambled VMEM file.
+        rom32 = convert_to_vmem(
+            ctx,
+            name = name,
+            src = binary,
+            word_size = 32,
+        )
         default = rom
         vmem = rom
     elif ctx.attr.kind == "flash":
@@ -58,6 +67,7 @@ def _transform(ctx, exec_env, name, elf, binary, signed_bin, disassembly, mapfil
         )
         default = vmem
         rom = None
+        rom32 = None
     else:
         fail("Not implemented: kind ==", ctx.attr.kind)
 
@@ -70,6 +80,7 @@ def _transform(ctx, exec_env, name, elf, binary, signed_bin, disassembly, mapfil
         "disassembly": disassembly,
         "mapfile": mapfile,
         "vmem": vmem,
+        "rom32": rom32,
     }
 
 def _test_dispatch(ctx, exec_env, provider):