Merge pull request #196 from YosysHQ/pio_error

ice40: Improve handling of unconstrained IO

1 files changed, 7 insertions, 0 deletions

diff --git a/ice40/main.cc b/ice40/main.cc
index 543bd229..286f68db 100644
--- a/ice40/main.cc
+++ b/ice40/main.cc
@@ -70,6 +70,8 @@ po::options_description Ice40CommandHandler::getArchOptions()
     specific.add_options()("no-promote-globals", "disable all global promotion");
     specific.add_options()("opt-timing", "run post-placement timing optimisation pass (experimental)");
     specific.add_options()("tmfuzz", "run path delay estimate fuzzer");
+    specific.add_options()("pcf-allow-unconstrained", "don't require PCF to constrain all IO");
+
     return specific;
 }
 void Ice40CommandHandler::validate()
@@ -87,6 +89,8 @@ void Ice40CommandHandler::customAfterLoad(Context *ctx)
         std::ifstream pcf(filename);
         if (!apply_pcf(ctx, filename, pcf))
             log_error("Loading PCF failed.\n");
+    } else {
+        log_warning("No PCF file specified; IO pins will be placed automatically\n");
     }
 }
 void Ice40CommandHandler::customBitstream(Context *ctx)
@@ -164,6 +168,9 @@ std::unique_ptr<Context> Ice40CommandHandler::createContext()
         ctx->settings[ctx->id("no_promote_globals")] = "1";
     if (vm.count("opt-timing"))
         ctx->settings[ctx->id("opt_timing")] = "1";
+    if (vm.count("pcf-allow-unconstrained"))
+        ctx->settings[ctx->id("pcf_allow_unconstrained")] = "1";
+
     return ctx;
 }