diff --git a/litex/build/colognechip/__init__.py b/litex/build/colognechip/__init__.py
new file mode 100644
index 000000000..4f7ade7e9
--- /dev/null
+++ b/litex/build/colognechip/__init__.py
@@ -0,0 +1 @@
+from litex.build.colognechip.platform import CologneChipPlatform
diff --git a/litex/build/colognechip/colognechip.py b/litex/build/colognechip/colognechip.py
new file mode 100644
index 000000000..2de8b7a6e
--- /dev/null
+++ b/litex/build/colognechip/colognechip.py
@@ -0,0 +1,156 @@
+#
+# This file is part of LiteX.
+#
+# Copyright (c) 2023 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabubucayre.com>
+# SPDX-License-Identifier: BSD-2-Clause
+
+import os
+import sys
+import math
+import subprocess
+from shutil import which, copyfile
+
+from migen.fhdl.structure import _Fragment
+
+from litex.build.generic_platform import *
+from litex.build import tools
+from litex.build.generic_toolchain import GenericToolchain
+from litex.build.yosys_wrapper import YosysWrapper, yosys_args, yosys_argdict
+
+
+# CologneChipToolchain -----------------------------------------------------------------------------
+
+class CologneChipToolchain(GenericToolchain):
+    attr_translate = {}
+    supported_build_backend = ["litex", "edalize"]
+
+    def __init__(self):
+        super().__init__()
+        self._yosys      = None
+        self._yosys_cmds = []
+        self._synth_opts = "-nomx8 "
+
+    def finalize(self):
+        self._yosys = YosysWrapper(
+            platform     = self.platform,
+            build_name   = self._build_name,
+            target       = "gatemate",
+            output_name  = self._build_name+"_synth",
+            template     = [],
+            yosys_opts   = self._synth_opts,
+            yosys_cmds   = self._yosys_cmds,
+            synth_format = "v",
+        )
+
+    # IO Constraints (.ccf) ------------------------------------------------------------------------
+
+    def _get_pin_direction(self, pinname):
+        pins = self.platform.constraint_manager.get_io_signals()
+        for pin in sorted(pins, key=lambda x: x.duid):
+            if (pinname.split("[")[0] == pin.name):
+                if pin.direction == "output":
+                    return "Pin_out"
+                elif pin.direction == "input":
+                    return "Pin_in"
+                else:
+                    return "Pin_inout"
+        return "Unknown"
+
+    def build_io_constraints(self):
+        ccf = []
+
+        flat_sc = []
+        for name, pins, other, resource in self.named_sc:
+            if len(pins) > 1:
+                for i, p in enumerate(pins):
+                    flat_sc.append((f"{name}[{i}]", p, other))
+            else:
+                flat_sc.append((name, pins[0], other))
+
+        for name, pin, other in flat_sc:
+            pin_cst = ""
+            if pin != "X":
+                direction = self._get_pin_direction(name)
+                pin_cst = f"{direction} \"{name}\" Loc = \"{pin}\""
+
+            for c in other:
+                if isinstance(c, Misc):
+                    pin_cst += f" | {c.misc}"
+            pin_cst += ";"
+            ccf.append(pin_cst)
+
+        if self.named_pc:
+            ccf.extend(self.named_pc)
+
+        tools.write_to_file(f"{self._build_name}.ccf", "\n".join(ccf))
+        return (f"{self._build_name}.ccf", "CCF")
+
+    # Project (.ys) --------------------------------------------------------------------------------
+
+    def build_project(self):
+        """ create project files (mainly Yosys ys file)
+        """
+        self._yosys.build_script()
+ 
+    # Script ---------------------------------------------------------------------------------------
+
+    def build_script(self):
+        """ create build_xxx.yy by using Yosys and p_r instances.
+            Return
+            ======
+                the script name (str)
+        """
+
+        if sys.platform in ("win32", "cygwin"):
+            script_ext      = ".bat"
+            script_contents = "@echo off\nrem Autogenerated by LiteX / git: " + tools.get_litex_git_revision() + "\n\n"
+            fail_stmt       = " || exit /b"
+        else:
+            script_ext      = ".sh"
+            script_contents = "# Autogenerated by LiteX / git: " + tools.get_litex_git_revision() + "\nset -e\n"
+            fail_stmt       = ""
+        fail_stmt += "\n"
+
+        # yosys call
+        script_contents += self._yosys.get_yosys_call("script") + fail_stmt
+        # p_r call
+        script_contents += "p_r -ccf {build_name}.ccf -A 1 -i {build_name}_synth.v -o {build_name} -lib ccag\n".format(
+            build_name = self._build_name)
+
+        script_file = "build_" + self._build_name + script_ext
+        tools.write_to_file(script_file, script_contents, force_unix=False)
+
+        return script_file
+
+    def run_script(self, script):
+        """ run build_xxx.yy script
+        Parameters
+        ==========
+        script: str
+            script name to use
+        """
+        if sys.platform in ("win32", "cygwin"):
+            shell = ["cmd", "/c"]
+        else:
+            shell = ["bash"]
+
+        if which("yosys") is None or which("p_r") is None:
+            msg = "Unable to find CologneChip toolchain, please:\n"
+            msg += "- Add Yosys/p_r toolchain to your $PATH."
+            raise OSError(msg)
+
+        if subprocess.call(shell + [script]) != 0:
+            raise OSError("Error occured during Yosys/p_r's script execution.")
+
+
+    def add_period_constraint(self, platform, clk, period):
+        pass
+
+def colognechip_args(parser):
+    # TODO: yosys (default's yosys aren't supported
+    # TODO: p_r args
+    pass
+
+def colognechip_argdict(args):
+    # TODO: ditto
+    return {}
diff --git a/litex/build/colognechip/common.py b/litex/build/colognechip/common.py
new file mode 100644
index 000000000..54955c33a
--- /dev/null
+++ b/litex/build/colognechip/common.py
@@ -0,0 +1,132 @@
+#
+# This file is part of LiteX.
+#
+# Copyright (c) 2023 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+# SPDX-License-Identifier: BSD-2-Clause
+
+from migen.fhdl.module import Module
+from migen.genlib.resetsync import AsyncResetSynchronizer
+
+from litex.build.io import *
+
+# CologneChip AsyncResetSynchronizer ---------------------------------------------------------------
+
+class CologneChipAsyncResetSynchronizerImpl(Module):
+    def __init__(self, cd, async_reset):
+        rst1 = Signal()
+        self.specials += [
+            Instance("CC_DFF",
+                p_CLK_INV = 0,
+                p_EN_INV  = 0,
+                p_SR_INV  = 0,
+                p_SR_VAL  = 1,
+                i_D       = 0,
+                i_CLK     = cd.clk,
+                i_EN      = 1,
+                i_SR      = async_reset,
+                o_Q       = rst1),
+            Instance("CC_DFF",
+                p_CLK_INV = 0,
+                p_EN_INV  = 0,
+                p_SR_INV  = 0,
+                p_SR_VAL  = 1,
+                i_D       = rst1,
+                i_CLK     = cd.clk,
+                i_EN      = 1,
+                i_SR      = async_reset,
+                o_Q       = cd.rst)
+        ]
+
+class CologneChipAsyncResetSynchronizer:
+    @staticmethod
+    def lower(dr):
+        return CologneChipAsyncResetSynchronizerImpl(dr.cd, dr.async_reset)
+
+# CologneChip DDR Input ----------------------------------------------------------------------------
+
+class CologneChipDDRInputImpl(Module):
+    def __init__(self, i, o1, o2, clk):
+        self.specials += Instance("CC_IDDR",
+            i_CLK = clk,
+            i_D   = i,
+            o_Q0  = o1,
+            o_Q1  = o2,
+        )
+
+class CologneChipDDRInput:
+    @staticmethod
+    def lower(dr):
+        return CologneChipInputImpl(dr.i, dr.o1, dr.o2, dr.clk)
+
+# CologneChip DDR Output ---------------------------------------------------------------------------
+
+class CologneChipDDROutputImpl(Module):
+    def __init__(self, i1, i2, o, clk):
+        self.specials += Instance("CC_ODDR",
+            p_CLK_INV = 0,
+            i_CLK     = clk,
+            i_DDR     = ~clk,
+            i_D0      = i1,
+            i_D1      = i2,
+            o_Q       = o,
+        )
+
+class CologneChipDDROutput:
+    @staticmethod
+    def lower(dr):
+        return CologneChipDDROutputImpl(dr.i1, dr.i2, dr.o, dr.clk)
+
+# CologneChip Differential Input -------------------------------------------------------------------
+
+class CologneChipDifferentialInputImpl(Module):
+    def __init__(self, i_p, i_n, o):
+        self.specials += Instance("CC_LVDS_IBUF",
+            i_I_P = i_p,
+            i_I_N = i_n,
+            o_Y  = o,
+        )
+
+class CologneChipDifferentialInput:
+    @staticmethod
+    def lower(dr):
+        return CologneChipDifferentialInputImpl(dr.i_p, dr.i_n, dr.o)
+
+# CologneChip Differential Output ------------------------------------------------------------------
+
+class CologneChipDifferentialOutputImpl(Module):
+    def __init__(self, i, o_p, o_n):
+        self.specials += Instance("CC_LVDS_OBUF",
+            i_A  = i,
+            o_O_P = o_p,
+            o_O_N = o_n,
+        )
+
+class CologneChipDifferentialOutput:
+    @staticmethod
+    def lower(dr):
+        return CologneChipDifferentialOutputImpl(dr.i, dr.o_p, dr.o_n)
+
+# CologneChip SDR Input ----------------------------------------------------------------------------
+
+class CologneChipSDRInputImpl(Module):
+    def __init__(self, i, o):
+        self.specials += Instance("CC_IBUF",
+            i_I  = i,
+            o_O = o,
+        )
+
+class CologneChipSDRInput:
+    @staticmethod
+    def lower(dr):
+        return CologneChipSDRInput(dr.i, dr.o)
+
+# CologneChip Special Overrides --------------------------------------------------------------------
+
+colognechip_special_overrides = {
+    AsyncResetSynchronizer: CologneChipAsyncResetSynchronizer,
+    DDRInput:               CologneChipDDRInput,
+    DDROutput:              CologneChipDDROutput,
+    DifferentialInput:      CologneChipDifferentialInput,
+    DifferentialOutput:     CologneChipDifferentialOutput,
+    SDRInput:               CologneChipSDRInput,
+}
diff --git a/litex/build/colognechip/platform.py b/litex/build/colognechip/platform.py
new file mode 100644
index 000000000..127c4e2fb
--- /dev/null
+++ b/litex/build/colognechip/platform.py
@@ -0,0 +1,68 @@
+#
+# This file is part of LiteX.
+#
+# Copyright (c) 2023 Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabubucayre.com>
+# SPDX-License-Identifier: BSD-2-Clause
+
+import os
+
+from litex.build.generic_platform import GenericPlatform
+from litex.build.colognechip import common, colognechip
+
+# CologneChipPlatform ------------------------------------------------------------------------------
+
+class CologneChipPlatform(GenericPlatform):
+    bitstream_ext = "_00.cfg.bit"
+
+    _supported_toolchains = ["colognechip"]
+
+    def __init__(self, device, *args, toolchain="colognechip", devicename=None, **kwargs):
+        GenericPlatform.__init__(self, device, *args, **kwargs)
+
+        self.toolchain = colognechip.CologneChipToolchain()
+
+    def get_verilog(self, *args, special_overrides=dict(), **kwargs):
+        so = dict(common.colognechip_special_overrides)
+        so.update(special_overrides)
+        return GenericPlatform.get_verilog(self, *args,
+            special_overrides = so,
+            attr_translate    = self.toolchain.attr_translate,
+            **kwargs)
+
+    def build(self, *args, **kwargs):
+        return self.toolchain.build(self, *args, **kwargs)
+
+    def add_period_constraint(self, clk, period):
+        if clk is None: return
+        self.toolchain.add_period_constraint(self, clk, period)
+
+    @classmethod
+    def fill_args(cls, toolchain, parser):
+        """
+        pass parser to the specific toolchain to
+        fill this with toolchain args
+
+        Parameters
+        ==========
+        toolchain: str
+            toolchain name
+        parser: argparse.ArgumentParser
+            parser to be filled
+        """
+        colognechip.colognechip_args(parser)
+
+    @classmethod
+    def get_argdict(cls, toolchain, args):
+        """
+        return a dict of args
+
+        Parameters
+        ==========
+        toolchain: str
+            toolchain name
+
+        Return
+        ======
+        a dict of key/value for each args or an empty dict
+        """
+        return colognechip.colognechip_argdict(args)