stdlib: Add get_devices to abstract board

This function returns the GPUs (for now, possibly other devices in the
future). It needs to be in the abstract board so the GPU-specific cache
hierarchies can be used with non-GPU boards.

Signed-off-by: Jason Lowe-Power <jason@lowepower.com>

src/python/gem5/components/boards/abstract_board.py

@@ -160,6 +160,15 @@ class AbstractBoard:
         """
         return self.cache_line_size
 
+    def get_devices(self):
+        """Get the devices connected to the board.
+
+        Currently, this is only used for GPUs by the ViperBoard.
+
+        :returns: The devices connected to the board or None.
+        """
+        return None
+
     def connect_system_port(self, port: Port) -> None:
         self.system_port = port
 

src/python/gem5/prebuilt/viper/board.py

@@ -73,6 +73,7 @@ class ViperBoard(X86Board):
 
         self._gpus = gpus
 
+    @overrides(AbstractBoard)
     def get_devices(self):
         return self._gpus