add duke

duke.json

@@ -0,0 +1,33 @@
+{
+    "target": "kasli",
+    "variant": "duke",
+    "hw_rev": "v1.1",
+    "base": "standalone",
+    "core_addr": "192.168.1.75",
+    "peripherals": [
+        {
+            "type": "dio",
+            "ports": [4],
+            "bank_direction_low": "input",
+            "bank_direction_high": "output",
+            "edge_counter": true
+        },
+        {
+            "type": "urukul",
+            "ports": [3, 2],
+            "clk_sel": 0
+        },
+        {
+            "type": "sampler",
+            "ports": [6, 5]
+        },
+        {
+            "type": "zotino",
+            "ports": [7]
+        },
+        {
+            "type": "grabber",
+            "ports": [1, 0]
+        }
+   ]
+}