Add support for Crosslink NX with Nextpnr FPGA Interchange

Signed-off-by: Robert Szczepanski <[email protected]>

Author: robertszczepanski

Makefile

@@ -37,7 +37,7 @@ QUICKLOGIC_URL = https://storage.googleapis.com/symbiflow-arch-defs-install/quic
 
 INTERCHANGE_BASE_URL = https://storage.googleapis.com/fpga-interchange-tests/artifacts/prod/foss-fpga-tools/fpga-interchange-tests/continuous/50/20211008-072036
 INTERCHANGE_VERSION = 6ff4159
-INTERCHANGE_DEVICES ?= xc7a35t xc7a100t xc7a200t xc7z010 xczu7ev
+INTERCHANGE_DEVICES ?= xc7a35t xc7a100t xc7a200t xc7z010 xczu7ev LIFCL-17 LIFCL-40
 RAPIDWRIGHT_PATH = $(TOP_DIR)/third_party/RapidWright
 
 

toolchains/nextpnr.py

@@ -74,7 +74,7 @@ def get_share_data(self):
         return os.path.join(nextpnr_location, '..', 'share')
 
     def configure(self):
-        assert self.xdc
+        assert self.xdc, "Interchange format requires xdc constraint file."
 
         os.makedirs(self.out_dir, exist_ok=True)
 
@@ -390,7 +390,7 @@ def __init__(self, rootdir):
 
     def prepare_edam(self):
         assert "fasm2bels" not in self.toolchain, "fasm2bels unsupported for fpga_interchange variant"
-        self.chip = self.family + self.device
+        self.chip = self.family + self.device if self.family != "nexus" else self.device
         share_dir = NextpnrGeneric.get_share_data(self)
         self.chipdb = os.path.join(
             self.rootdir, 'env', 'interchange', 'devices', self.chip,
@@ -414,10 +414,15 @@ def prepare_edam(self):
             'env.sh'
         ) + ' nextpnr fpga_interchange-' + self.device
 
-        self.yosys_synth_opts = [
-            "-flatten", "-nowidelut", "-arch {}".format(self.family), "-nodsp",
-            "-nosrl"
-        ]
+        if self.family != "nexus":
+            self.yosys_synth_opts = [
+                "-flatten", "-nowidelut", "-arch {}".format(self.family), "-nodsp",
+                "-nosrl"
+            ]
+        else:
+            self.yosys_synth_opts = [
+                "-flatten", "-nowidelut", "-nodsp"
+            ]
 
         lib_file = os.path.join(
             self.rootdir, 'env', 'interchange', 'techmaps',