diff --git a/himbaechel/uarch/gatemate/ccf.cc b/himbaechel/uarch/gatemate/ccf.cc
new file mode 100644
index 00000000..9d73aae3
--- /dev/null
+++ b/himbaechel/uarch/gatemate/ccf.cc
@@ -0,0 +1,218 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2024  The Project Peppercorn Authors.
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <algorithm>
+#include <boost/algorithm/string.hpp>
+#include <boost/lexical_cast.hpp>
+#include <fstream>
+#include <regex>
+
+#include "extra_data.h"
+#include "himbaechel_api.h"
+#include "log.h"
+#include "nextpnr.h"
+#include "util.h"
+
+#include "gatemate.h"
+
+#define HIMBAECHEL_CONSTIDS "uarch/gatemate/constids.inc"
+#include "himbaechel_constids.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+struct GateMateCCFReader
+{
+    Context *ctx;
+    std::istream &in;
+    int lineno;
+    dict<IdString, Property> defaults;
+
+    GateMateCCFReader(Context *ctx, std::istream &in) : ctx(ctx), in(in) {};
+
+    std::string strip_quotes(const std::string &str)
+    {
+        if (str.at(0) == '"') {
+            if (str.back() != '"') {
+                log_error("expected '\"' at end of string '%s' (on line %d).\n", str.c_str(), lineno);
+            }
+            return str.substr(1, str.size() - 2);
+        } else {
+            return str;
+        }
+    };
+
+    void parse_params(std::vector<std::string> &params, bool is_default, dict<IdString, Property> *props)
+    {
+        for (auto param : params) {
+            std::vector<std::string> expr;
+            boost::split(expr, param, boost::is_any_of("="));
+            if (expr.size() != 2)
+                log_error("each parameter must be in form NAME=VALUE (on line %d)\n", lineno);
+
+            std::string name = expr.at(0);
+            boost::algorithm::trim(name);
+            boost::algorithm::to_upper(name);
+            std::string value = strip_quotes(expr.at(1));
+            boost::algorithm::trim(value);
+            boost::algorithm::to_upper(value);
+
+            if (name == "LOC") {
+                if (is_default)
+                    log_error("Value '%s' can not be defined for default GPIO in line %d.\n", name.c_str(), lineno);
+                props->emplace(ctx->id(name.c_str()), Property(value));
+            } else if (name == "SCHMITT_TRIGGER" || name == "PULLUP" || name == "PULLDOWN" || name == "KEEPER" ||
+                       name == "FF_IBF" || name == "FF_OBF" || name == "LVDS_BOOST" || name == "LVDS_RTERM") {
+                if (value == "TRUE") {
+                    props->emplace(ctx->id(name.c_str()), Property(Property::State::S1));
+                } else if (value == "FALSE") {
+                    props->emplace(ctx->id(name.c_str()), Property(Property::State::S0));
+                } else
+                    log_error("Uknown value '%s' for parameter '%s' in line %d, must be TRUE or FALSE.\n",
+                              value.c_str(), name.c_str(), lineno);
+            } else if (name == "SLEW") {
+                if (value == "FAST") {
+                    props->emplace(ctx->id(name.c_str()), Property(Property::State::S1));
+                } else if (value == "SLOW") {
+                    props->emplace(ctx->id(name.c_str()), Property(Property::State::S0));
+                } else
+                    log_error("Uknown value '%s' for parameter '%s' in line %d, must be SLOW or FAST.\n", value.c_str(),
+                              name.c_str(), lineno);
+            } else if (name == "DRIVE") {
+                try {
+                    int drive = boost::lexical_cast<int>(value.c_str());
+                    if (drive == 3 || drive == 6 || drive == 9 || drive == 12) {
+                        props->emplace(ctx->id(name.c_str()), Property((drive - 3) / 3, 2));
+                    } else
+                        log_error("Parameter '%s' must have value 3,6,9 or 12 in line %d.\n", name.c_str(), lineno);
+                } catch (boost::bad_lexical_cast const &) {
+                    log_error("Parameter '%s' must be number in line %d.\n", name.c_str(), lineno);
+                }
+            } else if (name == "DELAY_IBF" || name == "DELAY_OBF") {
+                try {
+                    int delay = boost::lexical_cast<int>(value.c_str());
+                    if (delay >= 0 && delay <= 15) {
+                        props->emplace(ctx->id(name.c_str()), Property(delay, 4));
+                    } else
+                        log_error("Parameter '%s' must have value from 0 to 15 in line %d.\n", name.c_str(), lineno);
+                } catch (boost::bad_lexical_cast const &) {
+                    log_error("Parameter '%s' must be number in line %d.\n", name.c_str(), lineno);
+                }
+            } else {
+                log_error("Uknown parameter name '%s' in line %d.\n", name.c_str(), lineno);
+            }
+        }
+    }
+
+    bool run()
+    {
+        try {
+            log_info("Parsing CCF file..\n");
+
+            std::string line;
+            std::string linebuf;
+            defaults.clear();
+
+            auto isempty = [](const std::string &str) {
+                return std::all_of(str.begin(), str.end(), [](char c) { return isblank(c) || c == '\r' || c == '\n'; });
+            };
+            lineno = 0;
+            while (std::getline(in, line)) {
+                ++lineno;
+                // Both // and # are considered start of comment
+                size_t com_start = line.find("//");
+                if (com_start != std::string::npos)
+                    line = line.substr(0, com_start);
+                com_start = line.find('#');
+                if (com_start != std::string::npos)
+                    line = line.substr(0, com_start);
+                if (isempty(line))
+                    continue;
+                linebuf += line;
+
+                size_t pos = linebuf.find(';');
+                // Need to concatenate lines until there is closing ; sign
+                while (pos != std::string::npos) {
+                    std::string content = linebuf.substr(0, pos);
+
+                    std::vector<std::string> params;
+                    boost::split(params, content, boost::is_any_of("|"));
+                    std::string command = params.at(0);
+
+                    std::stringstream ss(command);
+                    std::vector<std::string> words;
+                    std::string tmp;
+                    while (ss >> tmp)
+                        words.push_back(tmp);
+                    std::string type = words.at(0);
+
+                    boost::algorithm::to_lower(type);
+                    if (type == "default_gpio") {
+                        if (words.size() != 1)
+                            log_error("line with default_GPIO should not contain only parameters (in line %d).\n",
+                                      lineno);
+                        params.erase(params.begin());
+                        parse_params(params, true, &defaults);
+
+                    } else if (type == "pin_in" || type == "pin_out" || type == "pin_inout") {
+                        if (words.size() < 3 || words.size() > 5)
+                            log_error("pin definition line not properly formed (in line %d).\n", lineno);
+                        std::string pin_name = strip_quotes(words.at(1));
+                        printf("name:%s\n", pin_name.c_str());
+
+                        // put back other words and use them as parameters
+                        std::stringstream ss;
+                        for (size_t i = 2; i < words.size(); i++)
+                            ss << words.at(i);
+                        params[0] = ss.str();
+
+                        IdString cellname = ctx->id(pin_name);
+                        if (ctx->cells.count(cellname)) {
+                            CellInfo *cell = ctx->cells.at(cellname).get();
+                            for (auto p : defaults)
+                                cell->params[p.first] = p.second;
+                            parse_params(params, false, &cell->params);
+                        } else
+                            log_warning("Pad with name '%s' not found in netlist.\n", pin_name.c_str());
+                    } else {
+                        log_error("unknown type '%s' in line %d.\n", type.c_str(), lineno);
+                    }
+
+                    linebuf = linebuf.substr(pos + 1);
+                    pos = linebuf.find(';');
+                }
+            }
+            if (!isempty(linebuf))
+                log_error("unexpected end of CCF file\n");
+            return true;
+        } catch (log_execution_error_exception) {
+            return false;
+        }
+    }
+};
+
+bool GateMateImpl::parse_ccf(const std::string &filename)
+{
+    std::ifstream in(filename);
+    if (!in)
+        log_error("failed to open CCF file '%s'\n", filename.c_str());
+    GateMateCCFReader reader(ctx, in);
+    return reader.run();
+}
+
+NEXTPNR_NAMESPACE_END
diff --git a/himbaechel/uarch/gatemate/gatemate.cc b/himbaechel/uarch/gatemate/gatemate.cc
index 028d8f13..f0556d88 100644
--- a/himbaechel/uarch/gatemate/gatemate.cc
+++ b/himbaechel/uarch/gatemate/gatemate.cc
@@ -26,8 +26,8 @@
 
 #include "himbaechel_helpers.h"
 
-#include "gatemate.h"
 #include "config.h"
+#include "gatemate.h"
 
 #define GEN_INIT_CONSTIDS
 #define HIMBAECHEL_CONSTIDS "uarch/gatemate/constids.inc"
@@ -80,6 +80,11 @@ void GateMateImpl::drawBel(std::vector<GraphicElement> &g, GraphicElement::style
 
 void GateMateImpl::pack()
 {
+    const ArchArgs &args = ctx->args;
+    if (args.options.count("ccf")) {
+        parse_ccf(args.options.at("ccf"));
+    }
+
     const pool<CellTypePort> top_ports{
             CellTypePort(id_CC_IBUF, id_I),
             CellTypePort(id_CC_OBUF, id_O),
@@ -93,17 +98,19 @@ void GateMateImpl::pack()
         if (ci.type == id_CC_IBUF) {
             ci.renamePort(id_I, id_DI);
             ci.renamePort(id_Y, id_IN1);
-            ci.params[ctx->id("INIT")] = Property("000000000000000000000001000000000000000000000000000000000000000001010000");
+            ci.params[ctx->id("INIT")] =
+                    Property("000000000000000000000001000000000000000000000000000000000000000001010000");
             // x=-2 y=99
-            BelId bel = ctx->getBelByName(IdStringList::concat(ctx->idf("X%dY%d",-2+2,99+2), id_GPIO));
+            BelId bel = ctx->getBelByName(IdStringList::concat(ctx->idf("X%dY%d", -2 + 2, 99 + 2), id_GPIO));
             ctx->bindBel(bel, &ci, PlaceStrength::STRENGTH_FIXED);
         }
         if (ci.type == id_CC_OBUF) {
             ci.renamePort(id_O, id_DO);
             ci.renamePort(id_A, id_OUT2);
-            ci.params[ctx->id("INIT")] = Property("000000000000000000000000000000000000000100000000000000010000100100000000");
+            ci.params[ctx->id("INIT")] =
+                    Property("000000000000000000000000000000000000000100000000000000010000100100000000");
             // x=-2 y=95
-            BelId bel = ctx->getBelByName(IdStringList::concat(ctx->idf("X%dY%d",-2+2,95+2), id_GPIO));
+            BelId bel = ctx->getBelByName(IdStringList::concat(ctx->idf("X%dY%d", -2 + 2, 95 + 2), id_GPIO));
             ctx->bindBel(bel, &ci, PlaceStrength::STRENGTH_FIXED);
         }
         ci.type = id_GPIO;
@@ -116,16 +123,20 @@ delay_t GateMateImpl::estimateDelay(WireId src, WireId dst) const
     tile_xy(ctx->chip_info, src.tile, sx, sy);
     tile_xy(ctx->chip_info, dst.tile, dx, dy);
 
-    return 100 * (std::abs(dx - sx)/4 + std::abs(dy - sy)/4 + 2);
+    return 100 * (std::abs(dx - sx) / 4 + std::abs(dy - sy) / 4 + 2);
 }
 
-void get_bitstream_tile(int x,int y,int &b_x,int &b_y)
+void get_bitstream_tile(int x, int y, int &b_x, int &b_y)
 {
     // Edge blocks are bit bigger
-    if (x==-2) x++;
-    if (x==163) x--;
-    if (y==-2) y++;
-    if (y==131) y--;
+    if (x == -2)
+        x++;
+    if (x == 163)
+        x--;
+    if (y == -2)
+        y++;
+    if (y == 131)
+        y--;
     b_x = (x + 1) / 2;
     b_y = (y + 1) / 2;
 }
@@ -156,7 +167,7 @@ CfgLoc getConfigLoc(Context *ctx, int tile)
     int x0, y0;
     int bx, by;
     tile_xy(ctx->chip_info, tile, x0, y0);
-    get_bitstream_tile(x0 - 2,y0 - 2, bx, by);
+    get_bitstream_tile(x0 - 2, y0 - 2, bx, by);
     CfgLoc loc;
     loc.die = 0;
     loc.x = bx;
@@ -170,23 +181,25 @@ void GateMateImpl::postRoute()
     if (args.options.count("out")) {
         ChipConfig cc;
         cc.chip_name = args.device;
-        cc.configs[0].add_word("GPIO.BANK_E1", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_E2", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_N1", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_N2", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_S1", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_S2", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_W1", int_to_bitvector(1,1));
-        cc.configs[0].add_word("GPIO.BANK_W2", int_to_bitvector(1,1));
+        cc.configs[0].add_word("GPIO.BANK_E1", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_E2", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_N1", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_N2", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_S1", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_S2", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_W1", int_to_bitvector(1, 1));
+        cc.configs[0].add_word("GPIO.BANK_W2", int_to_bitvector(1, 1));
         for (auto &cell : ctx->cells) {
             switch (cell.second->type.index) {
-                case id_GPIO.index: {
-                    CfgLoc loc = getConfigLoc(ctx, cell.second.get()->bel.tile);
-                    cc.tiles[loc].add_word("GPIO.INIT", str_to_bitvector(str_or_default(cell.second.get()->params,ctx->id("INIT"),""), 72));
-                    break;
-                }
-                default:
-                    break;
+            case id_GPIO.index: {
+                CfgLoc loc = getConfigLoc(ctx, cell.second.get()->bel.tile);
+                cc.tiles[loc].add_word(
+                        "GPIO.INIT",
+                        str_to_bitvector(str_or_default(cell.second.get()->params, ctx->id("INIT"), ""), 72));
+                break;
+            }
+            default:
+                break;
             }
         }
 
@@ -198,11 +211,12 @@ void GateMateImpl::postRoute()
             for (auto &w : ni->wires) {
                 if (w.second.pip != PipId()) {
                     PipId pip = w.second.pip;
-                    const auto extra_data = *reinterpret_cast<const GateMatePipExtraDataPOD *>(chip_pip_info(ctx->chip_info, pip).extra_data.get());
-                    if (extra_data.name!=0) {
+                    const auto extra_data = *reinterpret_cast<const GateMatePipExtraDataPOD *>(
+                            chip_pip_info(ctx->chip_info, pip).extra_data.get());
+                    if (extra_data.name != 0) {
                         IdString name = IdString(extra_data.name);
                         CfgLoc loc = getConfigLoc(ctx, pip.tile);
-                        cc.tiles[loc].add_word(name.c_str(ctx),int_to_bitvector(extra_data.value, extra_data.bits));
+                        cc.tiles[loc].add_word(name.c_str(ctx), int_to_bitvector(extra_data.value, extra_data.bits));
                     }
                 }
             }
diff --git a/himbaechel/uarch/gatemate/gatemate.h b/himbaechel/uarch/gatemate/gatemate.h
index 7e679977..b79e06f0 100644
--- a/himbaechel/uarch/gatemate/gatemate.h
+++ b/himbaechel/uarch/gatemate/gatemate.h
@@ -45,6 +45,8 @@ struct GateMateImpl : HimbaechelAPI
 
     void drawBel(std::vector<GraphicElement> &g, GraphicElement::style_t style, IdString bel_type, Loc loc) override;
 
+    bool parse_ccf(const std::string &filename);
+
   private:
     HimbaechelHelpers h;
 };