From 4543751a773c770e444ab3c6acc586f6a9b4a510 Mon Sep 17 00:00:00 2001
From: Tristan Gingold <tristan.gingold@cern.ch>
Date: Thu, 18 Nov 2021 08:43:20 +0100
Subject: [PATCH] synth_sf2: add -discard-ffinit option to discard ff initial
value
sf2 ff have no initial values, but some IP cores use initial values.
In order to use those cores on sf2, it is required to discard the
initial value (to be carefully used).
---
techlibs/sf2/synth_sf2.cc | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/techlibs/sf2/synth_sf2.cc b/techlibs/sf2/synth_sf2.cc
index f78b4f012..fcc0a5e23 100644
--- a/techlibs/sf2/synth_sf2.cc
+++ b/techlibs/sf2/synth_sf2.cc
@@ -66,6 +66,9 @@ struct SynthSf2Pass : public ScriptPass
log(" -clkbuf\n");
log(" insert direct PAD->global_net buffers\n");
log("\n");
+ log(" -discard-ffinit\n");
+ log(" discard FF init value instead of emitting an error\n");
+ log("\n");
log(" -retime\n");
log(" run 'abc' with '-dff -D 1' options\n");
log("\n");
@@ -76,7 +79,7 @@ struct SynthSf2Pass : public ScriptPass
}
string top_opt, edif_file, vlog_file, json_file;
- bool flatten, retime, iobs, clkbuf;
+ bool flatten, retime, iobs, clkbuf, discard_ffinit;
void clear_flags() override
{
@@ -88,6 +91,7 @@ struct SynthSf2Pass : public ScriptPass
retime = false;
iobs = true;
clkbuf = false;
+ discard_ffinit = false;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@@ -138,6 +142,10 @@ struct SynthSf2Pass : public ScriptPass
clkbuf = true;
continue;
}
+ if (args[argidx] == "-discard-ffinit") {
+ discard_ffinit = true;
+ continue;
+ }
break;
}
extra_args(args, argidx, design);
@@ -171,6 +179,8 @@ struct SynthSf2Pass : public ScriptPass
if (check_label("coarse"))
{
+ if (discard_ffinit || help_mode)
+ run("attrmap -remove init", "(only if -discard-ffinit)");
run("synth -run coarse");
}