Added back in the jtag bridge

Now talking over the bus instead of using dpram

scripts/hex_to_mif.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 """Convert a simple .hex image to a plain .mif-style binary file.
 
-Default output format matches build/mem_8kx8b.mif in this repo:
+Default output format is 32-bit words:
 - one binary word per line
 - no header
 """
@@ -57,8 +57,8 @@ def main() -> None:
     parser.add_argument(
         "--word-bytes",
         type=int,
-        default=1,
-        help="Bytes per output word (default: 1)",
+        default=4,
+        help="Bytes per output word (default: 4)",
     )
     parser.add_argument(
         "--little-endian",