ld: now generates a full rom vhdl from template

tools/ld.py

@@ -1,4 +1,5 @@
 import argparse
+import string
 import struct
 import sys
 
@@ -74,8 +75,7 @@ def parse_args():
                         help='input file (default: stdin)')
     parser.add_argument('--output', '-o', type=argparse.FileType('wb'),
                         default=sys.stdout.buffer, help='output file')
-    parser.add_argument('--vhdl', action='store_true',
-                        help='vhdl output')
+    parser.add_argument('--vhdl', help='vhdl output with given template')
     return parser.parse_args()
 
 
@@ -90,8 +90,13 @@ def main():
     text = dump(sectionmap)
 
     if args.vhdl:
-        args.output.write(',\n'.join(f'x"{x:04x}"' for x in
-                          struct.unpack(f'>{len(text) // 2}H', text)).encode())
+        words = struct.unpack(f'>{len(text) // 2}H', text)
+        subd = dict(words=',\n'.join(f'x"{w:04x}"' for w in words), nwords=len(words))
+
+        with open(args.vhdl) as fin:
+            tpl = string.Template(fin.read())
+        args.output.write(tpl.substitute(subd).encode())
+
     else:
         args.output.write(text)