fix(cocotb - ndp): increase RAM size and check for sufficient space

Author: martinspinler

python/cocotbext/cocotbext/nfb/device.py

@@ -26,7 +26,7 @@ def __init__(self, dut, ram=None, servicer=NfbPythonServicer):
         self.mi = None
         self._dut = dut
 
-        self.ram = ram if ram else RAM(0x02000000)
+        self.ram = ram if ram else RAM(0x08000000)
         self._servicer_cls = servicer
 
         self._init_pcie()

python/cocotbext/cocotbext/nfb/queue.py

@@ -60,6 +60,10 @@ def __init__(self, dev, node, buf_index):
         self._hdr_base = bb + bs + (bs // 4) * 1 # if self._dir == 0 else 0
         self._upd_base = bb + bs + (bs // 4) * 2
 
+        if self._upd_base + 4 > len(self._ram._mem):
+            raise Exception("Not enough memory for QueueNdp in RAM object. "
+                            "Try to increase RAM size or decrease number of queues")
+
     def update_desc_upper_address(self, ba):
         desc = self._ctrl.desc0(ba)
         if self._ctrl.last_upper_addr == desc: