o add gnususb as reference bootloader

o refactor boot loader  cpde
o

tools/gnusb/bootloader/firmware/checksize

@@ -0,0 +1,35 @@
+#!/bin/sh
+# Name: checksize
+# Project: PowerSwitch/AVR-USB
+# Author: Christian Starkjohann
+# Creation Date: 2004-12-29
+# Tabsize: 4
+# Copyright: (c) 2005 OBJECTIVE DEVELOPMENT Software GmbH.
+# Revision: $Id: checksize 83 2006-01-05 22:20:53Z cs $
+
+error=0
+codelimit=2048  # default value
+datalimit=96    # default value; leave 32 bytes for stack
+
+if [ $# -gt 1 ]; then
+	codelimit="$2"
+fi
+if [ $# -gt 2 ]; then
+	datalimit="$3"
+fi
+
+set -- `avr-size -d "$1" | awk '/[0-9]/ {print $1 + $2, $2 + $3, $2}'`
+if [ $1 -gt $codelimit ]; then
+	echo "*** code size $1 exceeds limit of $codelimit"
+	error=1
+else
+	echo "ROM: $1 bytes (data=$3)"
+fi
+if [ $2 -gt $datalimit ]; then
+	echo "*** data size $2 exceeds limit of $datalimit"
+	error=1
+else
+	echo "RAM: $2 bytes"
+fi
+
+exit $error