boards: initial bancha board support.

Bypass-Presubmit-Reason: verified as part of topic

Change-Id: Ia568983f19b6d0aa2b0979ea61b9a7cb0fa24d4f

sdk/boards/bancha.json

diff --git a/sdk/boards/bancha.json b/sdk/boards/bancha.json
new file mode 100644
index 0000000..af6f039
--- /dev/null
+++ b/sdk/boards/bancha.json
@@ -0,0 +1,87 @@
+{
+    "devices": {
+        "clint": {
+            "start"  : 0x2000000,
+            "length" : 0x10000
+        },
+        "plic": {
+            "start"  : 0x48000000,
+            "length" : 0x400000
+        },
+        "uart": {
+            "start": 0x54000000,
+            "end":   0x54000100
+        },
+        "i2s": {
+            "start": 0x54100000,
+            "length": 0x40
+        },
+        "ml_top_core": {
+            "start": 0x5C000000,
+            "length": 0x40
+        },
+        "ml_top_dmem": {
+            "start": 0x5A000000,
+            "length": 0x400000
+        },
+        "gpio": {
+            "start": 0x40040000,
+            "length": 0x40
+        },
+        "spi": {
+            "start": 0x40300000,
+            "length": 0x40
+        },
+        "shadow" : {
+            "start": 0x10370000,
+            "end":   0x10380000
+        }
+    },
+    "instruction_memory": {
+        "start": 0x10000000,
+        "end": 0x10400000
+    },
+    "heap": {
+        "start": 0x10380000,
+        "end":   0x10400000
+    },
+    "interrupts": [
+        {
+            "name": "I2sRxWatermarkInterrupt",
+            "number": 40,
+            "priority": 3
+        },
+        {
+            "name": "I2sTxWatermarkInterrupt",
+            "number": 39,
+            "priority": 3
+        },
+        {
+            "name": "I2sTxEmptyInterrupt",
+            "number": 41,
+            "priority": 3
+        },
+        {
+            "name": "MlTopFinishInterrupt",
+            "number": 34,
+            "priority": 3
+        },
+        {
+            "name": "MlTopFaultInterrupt",
+            "number": 35,
+            "priority": 3
+        }
+    ],
+    "defines" : [ "BANCHA" ],
+    "driver_includes" : [
+        "${sdk}/include/platform/bancha",
+        "${sdk}/include/platform/sencha",
+        "${sdk}/include/platform/generic-riscv"
+    ],
+    "timer_hz" : 2000,
+    "tickrate_hz" : 10,
+    "revoker" : "software",
+    "stack_high_water_mark" : true,
+    "simulator" : "cheriot_sim",
+    "simulation": true
+}