diff -r 46abd6b2f639 -r 427bf9130d12 targets/LPC/__init__.py
--- a/targets/LPC/__init__.py	Thu Feb 03 18:23:24 2011 +0100
+++ b/targets/LPC/__init__.py	Thu Feb 17 10:11:04 2011 +0100
@@ -1,22 +1,56 @@
-import os
-from subprocess import Popen,PIPE
-from .. import toolchain_makefile
-import hashlib
-
-class LPC_target(toolchain_makefile):
-    extension = ".ld"
-    DebugEnabled = False
-
-    def GetBinaryCode(self):
-        """Returns ready to send signed + sized intel formated hex program"""
-        try:
-            size = int(Popen(
-                 ['arm-elf-size','-B',os.path.join(self.buildpath,"ArmPLC_rom.elf")],
-                 stdout=PIPE).communicate()[0].splitlines()[1].split()[0])
-            res = "&" + hashlib.md5(open(os.path.join(self.buildpath, "ArmPLC_rom.bin"), "rb").read(size)).hexdigest() + '\n' +\
-                   "$" + str(size) + '\n' +\
-                   open(os.path.join(self.buildpath, "ArmPLC_rom.hex"), "r").read()
-            return res
-        except Exception, e:
-            return None
-
+import os
+from subprocess import Popen,PIPE
+from .. import toolchain_makefile
+import hashlib
+
+class LPC_target(toolchain_makefile):
+    #extension = ".ld"
+    #DebugEnabled = False
+    def __init__(self, PluginsRootInstance):
+        self.binmd5key = None
+        toolchain_makefile.__init__(self, PluginsRootInstance)
+
+    def _GetBinMD5FileName(self):
+        return os.path.join(self.buildpath, "lastbuildPLCbin.md5")
+
+    def _get_md5_header(self):
+        """Returns signature header"""
+        size = int(Popen(
+             ['arm-elf-size','-B',os.path.join(self.buildpath,"ArmPLC_rom.elf")],
+             stdout=PIPE).communicate()[0].splitlines()[1].split()[0])
+        res = "&" + hashlib.md5(open(os.path.join(self.buildpath, "ArmPLC_rom.bin"), "rb").read(size)).hexdigest() + '\n' +\
+              "$" + str(size) + '\n'
+        return res
+
+    def GetBinaryCode(self):
+        """Returns ready to send signed + sized intel formated hex program"""
+        try:
+            res = self._get_md5_header() +\
+                   open(os.path.join(self.buildpath, "ArmPLC_rom.hex"), "r").read()
+            return res
+        except Exception, e:
+            return None
+
+    def _get_cached_md5_header(self):
+        if self.binmd5key is not None:
+            return self.binmd5key
+        else:
+            try:
+                return open(self._GetMD5FileName(), "r").read()
+            except IOError, e:
+                return None
+
+    def GetBinaryCodeMD5(self, mode):
+        if mode == "BOOTLOADER":
+            return self._get_cached_md5_header()
+        else:
+            return toolchain_makefile.GetBinaryCodeMD5(self)
+
+    def build(self):
+        res = toolchain_makefile.build(self)
+        self.binmd5key = self._get_md5_header()
+        f = open(self._GetBinMD5FileName(), "w")
+        f.write(self.binmd5key)
+        f.close()
+        return res
+