From 72bc1224492ffb3c214131398e390fd0fab92950 Mon Sep 17 00:00:00 2001
From: Patrick Urban <patrick.urban@web.de>
Date: Wed, 15 Oct 2025 12:41:01 +0200
Subject: [PATCH] gmpack: add option to clear config latches

---
 libgm/src/Bitstream.cpp | 4 ++++
 libgm/tools/gmpack.cpp  | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/libgm/src/Bitstream.cpp b/libgm/src/Bitstream.cpp
index cfe5e0b..57fe7bb 100644
--- a/libgm/src/Bitstream.cpp
+++ b/libgm/src/Bitstream.cpp
@@ -836,6 +836,10 @@ Bitstream Bitstream::serialise_chip(const Chip &chip, const std::map<std::string
         }
         wr.write_cmd_path(0x10);
 
+        if (options.count("reset")) {
+            wr.write_cmd_cfgrst(0x00);
+        }
+
         bool change_crc = false;
         auto crcmode = crc_modes.begin();
         if (options.count("crcmode")) {
diff --git a/libgm/tools/gmpack.cpp b/libgm/tools/gmpack.cpp
index 08e235c..bdf2c76 100644
--- a/libgm/tools/gmpack.cpp
+++ b/libgm/tools/gmpack.cpp
@@ -37,6 +37,7 @@ int main(int argc, char *argv[])
     po::options_description options("Allowed options");
     options.add_options()("help,h", "show help");
     options.add_options()("verbose,v", "verbose output");
+    options.add_options()("reset", "Reset all configuration latches with CMD_CFGRST");
     options.add_options()("crcmode", po::value<std::string>(), "CRC error behaviour (check, ignore, unused)");
     options.add_options()("spimode", po::value<std::string>(), "SPI Mode to use (single, dual, quad)");
     options.add_options()("reconfig", "enable reconfiguration in bitstream");
@@ -82,6 +83,10 @@ int main(int argc, char *argv[])
 
     std::map<std::string, std::string> bitopts;
 
+    if (vm.count("reset")) {
+        bitopts["reset"] = "yes";
+    }
+
     if (vm.count("crcmode")) {
         bitopts["crcmode"] = vm["crcmode"].as<std::string>();
     }