From 8bc42ce53b1b78750ac1ae9b1992dbb2c15a819b Mon Sep 17 00:00:00 2001
From: Pepijn de Vos <pepijndevos@gmail.com>
Date: Wed, 9 Oct 2024 13:22:32 +0200
Subject: [PATCH] add iostd

---
 himbaechel/uarch/gowin/cst.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/himbaechel/uarch/gowin/cst.cc b/himbaechel/uarch/gowin/cst.cc
index f6ee1378..a22c64ea 100644
--- a/himbaechel/uarch/gowin/cst.cc
+++ b/himbaechel/uarch/gowin/cst.cc
@@ -254,6 +254,13 @@ static void add_sip_constraints(Context *ctx, const Extra_package_data_POD *extr
             log_error("Pin not found.\n");
         }
         it->second->setAttr(IdString(ID_BEL), std::string(ctx->nameOfBel(bel)));
+
+        if(cst.iostd > 0) {
+            std::string attr = "&IO_TYPE=";
+            attr += IdString(cst.iostd).c_str(ctx);
+            boost::algorithm::to_upper(attr);
+            it->second->setAttr(ctx->id(attr), 1);
+        }
     }
 }