diff --git a/litex/build/lattice/trellis.py b/litex/build/lattice/trellis.py
index 397b2dbd4..b804df7a2 100644
--- a/litex/build/lattice/trellis.py
+++ b/litex/build/lattice/trellis.py
@@ -60,7 +60,7 @@ def _build_lpf(named_sc, named_pc):
 
 
 def _build_script(source, build_template, build_name, architecture,
-                  basecfg, freq_constraint):
+                  freq_constraint):
     if sys.platform in ("win32", "cygwin"):
         script_ext = ".bat"
         build_script_contents = "@echo off\nrem Autogenerated by Migen\n\n"
@@ -74,7 +74,6 @@ def _build_script(source, build_template, build_name, architecture,
         s_fail = s + "{fail_stmt}\n"  # Required so Windows scripts fail early.
         build_script_contents += s_fail.format(build_name=build_name,
                                                architecture=architecture,
-                                               basecfg=basecfg,
                                                freq_constraint=freq_constraint,
                                                fail_stmt=fail_stmt)
 
@@ -130,7 +129,7 @@ class LatticeTrellisToolchain:
 
         self.build_template = [
             "yosys -q -l {build_name}.rpt {build_name}.ys",
-            "nextpnr-ecp5 --json {build_name}.json --lpf {build_name}.lpf --textcfg {build_name}.config --basecfg {basecfg} --{architecture} --freq {freq_constraint}",
+            "nextpnr-ecp5 --json {build_name}.json --lpf {build_name}.lpf --textcfg {build_name}.config --{architecture} --freq {freq_constraint}",
             "ecppack {build_name}.config {build_name}.bit"
         ]
 
@@ -166,16 +165,14 @@ class LatticeTrellisToolchain:
                                           for _ in self.yosys_template)
         tools.write_to_file(yosys_script_file, yosys_script_contents)
 
-        # transform platform.device to nextpnr's architecture / basecfg
+        # transform platform.device to nextpnr's architecture
         (family, size, package) = platform.device.split("-")
         architecture = nextpnr_ecp5_architectures[(family + "-" + size).lower()]
-        basecfg = "empty_" + (family + "-" + size).lower() + ".config"
-        basecfg = os.path.join(toolchain_path, "misc", "basecfgs", basecfg)
         freq_constraint = str(max(self.freq_constraints.values(),
                                   default=0.0))
 
         script = _build_script(False, self.build_template, build_name,
-                               architecture, basecfg, freq_constraint)
+                               architecture, freq_constraint)
 
         # run scripts
         if run: