diff --git a/litex_boards/platforms/gsd_butterstick.py b/litex_boards/platforms/gsd_butterstick.py
index d801473..05e270e 100644
--- a/litex_boards/platforms/gsd_butterstick.py
+++ b/litex_boards/platforms/gsd_butterstick.py
@@ -188,6 +188,7 @@ class Platform(LatticePlatform):
 
     def __init__(self, revision="1.0", device="85F", toolchain="trellis", **kwargs):
         assert revision in ["1.0"]
+        assert device in ["25F", "45F", "85F"]
         self.revision = revision
         io         = {"1.0": _io_r1_0}[revision]
         connectors = {"1.0": _connectors_r1_0}[revision]
diff --git a/litex_boards/platforms/gsd_orangecrab.py b/litex_boards/platforms/gsd_orangecrab.py
index d8dcc5a..1abbca8 100644
--- a/litex_boards/platforms/gsd_orangecrab.py
+++ b/litex_boards/platforms/gsd_orangecrab.py
@@ -222,6 +222,7 @@ class Platform(LatticePlatform):
 
     def __init__(self, revision="0.2", device="25F", toolchain="trellis", **kwargs):
         assert revision in ["0.1", "0.2"]
+        assert device in ["25F", "45F", "85F"]
         self.revision = revision
         io         = {"0.1": _io_r0_1,            "0.2": _io_r0_2        }[revision]
         connectors = {"0.1": _connectors_r0_1,    "0.2": _connectors_r0_2}[revision]