vendor.lattice_ecp5: revert default toolchain to Trellis.

This was unintentionally changed in 7fc1058e.

diff --git a/nmigen/vendor/lattice_ecp5.py b/nmigen/vendor/lattice_ecp5.py
index 1d2d9b029a9823042bbe4a365cf0b235f0aa10a6..99849cc1fd6a7afd3abe3be4fdf6e7a9a0160f63 100644 (file)
--- a/nmigen/vendor/lattice_ecp5.py
+++ b/nmigen/vendor/lattice_ecp5.py
@@ -233,7 +233,7 @@ class LatticeECP5Platform(TemplatedPlatform):
 
     # Common logic
 
-    def __init__(self, *, toolchain="Diamond"):
+    def __init__(self, *, toolchain="Trellis"):
         super().__init__()
 
         assert toolchain in ("Trellis", "Diamond")