--- a/python/ppci/layout.py	Thu May 01 14:03:12 2014 +0200
+++ b/python/ppci/layout.py	Thu May 01 17:40:59 2014 +0200
@@ -56,6 +56,14 @@
         return 'Align({})'.format(self.alignment)
 
 
+class SymbolDefinition(Input):
+    def __init__(self, symbol_name):
+        self.symbol_name = symbol_name
+
+    def __repr__(self):
+        return 'Symbol define: {}'.format(self.symbol_name)
+
+
 class LayoutLexer(BaseLexer):
     def __init__(self):
         tok_spec = [
@@ -67,7 +75,7 @@
            ('STRING', r"'.*?'", lambda typ, val: (typ, val[1:-1])),
         ]
         super().__init__(tok_spec)
-        self.kws = ['MEMORY', 'ALIGN', 'LOCATION','SECTION','SIZE']
+        self.kws = ['MEMORY', 'ALIGN', 'LOCATION','SECTION','SIZE', 'DEFINESYMBOL']
 
     def handle_id(self, typ, val):
         if val in self.kws:
@@ -90,6 +98,7 @@
         g.add_one_or_more('input', 'input_list')
         g.add_production('input', ['ALIGN', '(', 'NUMBER', ')'], self.handle_align)
         g.add_production('input', ['SECTION', '(', 'ID', ')'], self.handle_section)
+        g.add_production('input', ['DEFINESYMBOL', '(', 'ID', ')'], self.handle_defsym)
 
         g.start_symbol = 'layout'
         self.p = g.generate_parser()
@@ -112,6 +121,9 @@
     def handle_section(self, section_tag, lbrace, section_name, rbrace):
         return Section(section_name.val)
 
+    def handle_defsym(self, section_tag, lbrace, name, rbrace):
+        return SymbolDefinition(name.val)
+
 
 class LayoutLoader:
     def __init__(self):