diff --git a/tools/gen_appbin_py3.py b/tools/gen_appbin_py3.py
new file mode 100644
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+++ b/tools/gen_appbin_py3.py
@@ -0,0 +1,268 @@
+#!/usr/bin/python
+#
+# File	: gen_appbin_py3.py
+# This file is part of Espressif's generate bin script.
+# 
+# ESPRESSIF MIT License
+# 
+# Copyright (c) 2016 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
+# 
+# Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case,
+# it is free of charge, to any person obtaining a copy of this software and associated
+# documentation files (the "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the Software is furnished
+# to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in all copies or
+# substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+# 
+# 
+
+"""This file is part of Espressif's generate bin script.
+    argv[1] is elf file name
+    argv[2] is version num"""
+ 
+import sys
+import os
+import re
+import binascii
+import struct
+
+TEXT_ADDRESS = 0x40100000
+# app_entry = 0
+# data_address = 0x3ffb0000
+# data_end  = 0x40000000
+# text_end  = 0x40120000
+
+CHECKSUM_INIT = 0xEF
+
+chk_sum = CHECKSUM_INIT
+blocks = 0
+
+def write_file(file_name,data):
+    if file_name is None:
+        print('file_name cannot be none\n')
+        sys.exit(0)
+
+    fp = open(file_name,'ab')
+    if fp:
+        fp.seek(0,os.SEEK_END)
+        fp.write(data)
+        fp.close()
+    else:
+        print('%s write fail\n'%(file_name))
+     
+def combine_bin(file_name,dest_file_name,start_offset_addr,need_chk):
+    global chk_sum
+    global blocks
+    if dest_file_name is None:
+        print('dest_file_name cannot be none\n')
+        sys.exit(0)
+    if file_name:
+        fp = open(file_name, 'rb')
+        if fp:
+            ########## write text ##########
+            fp.seek(0, os.SEEK_END)
+            data_len = fp.tell()
+            if data_len:
+                if need_chk:
+                    tmp_len = (data_len + 3)
+                else:
+                    tmp_len = (data_len + 15) & (~15)
+                data_bin = struct.pack('<II', start_offset_addr, tmp_len)
+                write_file(dest_file_name, data_bin)
+                fp.seek(0, os.SEEK_SET)
+                data_bin = fp.read(data_len)
+                write_file(dest_file_name, data_bin)
+                if need_chk:    
+                    for loop in range(len(data_bin)):
+                    chk_sum ^= ord(data_bin[loop].to_bytes(length=1, byteorder='big'))
+                tmp_len = tmp_len - data_len
+                if tmp_len:
+                    data_str = ['00'] * (tmp_len)
+                    data_bin = binascii.a2b_hex(''.join(data_str))
+                    write_file(dest_file_name, data_bin)
+                    if need_chk:
+                        for loop in range(len(data_bin)):
+                            chk_sum ^= ord(data_bin[loop].to_bytes(length=1, byteorder='big'))
+                blocks = blocks + 1
+                fp.close()
+        else:
+            print('!!!Open %s fail!!!' % (file_name))
+
+def getFileCRC(_path): 
+    try: 
+        blocksize = 1024 * 64 
+        f = open(_path,"rb") 
+        str = f.read(blocksize) 
+        crc = 0 
+        while(len(str) != 0): 
+            crc = binascii.crc32(str, crc) 
+            str = f.read(blocksize) 
+        f.close() 
+    except: 
+        print('get file crc error!')
+        return 0 
+    return crc
+ 
+ def gen_appbin():
+    global chk_sum
+    global crc_sum
+    global blocks
+    if len(sys.argv) != 7:
+        print('Usage: gen_appbin.py eagle.app.out boot_mode flash_mode flash_clk_div flash_size_map')
+        sys.exit(0)
+    elf_file = sys.argv[1]
+    boot_mode = sys.argv[2]
+    flash_mode = sys.argv[3]
+    flash_clk_div = sys.argv[4]
+    flash_size_map = sys.argv[5]
+    user_bin = sys.argv[6]
+    flash_data_line  = 16
+    data_line_bits = 0xf 
+    
+    irom0text_bin_name = 'eagle.app.v6.irom0text.bin'
+    text_bin_name = 'eagle.app.v6.text.bin'
+    data_bin_name = 'eagle.app.v6.data.bin'
+    rodata_bin_name = 'eagle.app.v6.rodata.bin'
+    flash_bin_name ='eagle.app.flash.bin'
+    
+    BIN_MAGIC_FLASH  = 0xE9
+    BIN_MAGIC_IROM   = 0xEA
+    
+    if os.getenv('COMPILE')=='gcc' :
+        cmd = 'xtensa-lx106-elf-nm -g ' + elf_file + ' > eagle.app.sym'
+    else :
+        cmd = 'xt-nm -g ' + elf_file + ' > eagle.app.sym'
+    
+    os.system(cmd)
+
+    fp = open('./eagle.app.sym')
+    if fp is None:
+        print("open sym file error\n")
+        sys.exit(0)
+
+    lines = fp.readlines()
+    fp.close()
+    
+    entry_addr = None
+    p = re.compile('(\w*)(\sT\s)(call_user_start)$')
+    for line in lines:
+        m = p.search(line)
+        if m != None:
+            entry_addr = m.group(1)
+    
+    if entry_addr is None:
+        print('no entry point!!')
+        sys.exit(0)
+
+    data_start_addr = '0'
+    p = re.compile('(\w*)(\sA\s)(_data_start)$')
+    for line in lines:
+        m = p.search(line)
+        if m != None:
+            data_start_addr = m.group(1)
+    
+    rodata_start_addr = '0'
+    p = re.compile('(\w*)(\sA\s)(_rodata_start)$')
+    for line in lines:
+        m = p.search(line)
+        if m != None:
+            rodata_start_addr = m.group(1) 
+            
+    # write flash bin header
+    #============================
+    #  SPI FLASH PARAMS
+    #-------------------
+    #flash_mode=
+    #     0: QIO
+    #     1: QOUT
+    #     2: DIO
+    #     3: DOUT
+    #-------------------
+    #flash_clk_div=
+    #     0 :  80m / 2
+    #     1 :  80m / 3
+    #     2 :  80m / 4
+    #    0xf:  80m / 1
+    #-------------------
+    #flash_size_map=
+    #     0 : 512 KB (256 KB + 256 KB)
+    #     1 : 256 KB
+    #     2 : 1024 KB (512 KB + 512 KB)
+    
+    byte2=int(flash_mode)&0xff
+    byte3=(((int(flash_size_map)<<4)| int(flash_clk_div))&0xff)
+    app=int(user_bin)&0xff
+    
+    if boot_mode == '2':
+        # write irom bin head
+        #data_bin = struct.pack('<BBBBI',BIN_MAGIC_IROM,4,byte2,byte3,long(entry_addr,16))
+        data_bin = struct.pack('<BBBBI',BIN_MAGIC_IROM,4,0,app,int(entry_addr,16))
+        sum_size = len(data_bin)
+        write_file(flash_bin_name,data_bin)
+        
+        # irom0.text.bin
+        combine_bin(irom0text_bin_name,flash_bin_name,0x0,0)
+    if boot_mode == '1':
+         data_bin = struct.pack('<BBBBI',BIN_MAGIC_FLASH,3,0,app,int(entry_addr,16))
+    else:
+         data_bin = struct.pack('<BBBBI',BIN_MAGIC_FLASH,3,byte2,byte3,int(entry_addr,16))
+    sum_size = len(data_bin)
+    write_file(flash_bin_name,data_bin)
+    
+    # text.bin
+    combine_bin(text_bin_name,flash_bin_name,TEXT_ADDRESS,1)
+
+    # data.bin
+    if data_start_addr:
+        combine_bin(data_bin_name,flash_bin_name,int(data_start_addr,16),1)
+
+    # rodata.bin
+    combine_bin(rodata_bin_name,flash_bin_name,int(rodata_start_addr,16),1)
+    
+    # write checksum header
+    sum_size = os.path.getsize(flash_bin_name) + 1
+    sum_size = flash_data_line - (data_line_bits&sum_size)
+    if sum_size:
+        data_str = ['00']*(sum_size)
+        data_bin = binascii.a2b_hex(''.join(data_str))
+        write_file(flash_bin_name,data_bin)
+    write_file(flash_bin_name,chr(chk_sum & 0xFF).encode())
+    
+    if boot_mode == '1':
+        sum_size = os.path.getsize(flash_bin_name)
+        data_str = ['FF']*(0x10000-sum_size)
+        data_bin = binascii.a2b_hex(''.join(data_str))
+        write_file(flash_bin_name,data_bin)
+
+        fp = open(irom0text_bin_name,'rb')
+        if fp:
+            data_bin = fp.read()
+            write_file(flash_bin_name,data_bin)
+            fp.close()
+        else :
+            print('!!!Open %s fail!!!'%(flash_bin_name))
+            sys.exit(0)
+    if boot_mode == '1' or boot_mode == '2':
+        all_bin_crc = getFileCRC(flash_bin_name)
+        print(all_bin_crc)
+        if all_bin_crc < 0:
+            all_bin_crc = abs(all_bin_crc) - 1
+        else :
+            all_bin_crc = abs(all_bin_crc) + 1
+        print(all_bin_crc)
+        write_file(flash_bin_name,(chr((all_bin_crc & 0x000000FF))+chr((all_bin_crc & 0x0000FF00) >> 8)+chr((all_bin_crc & 0x00FF0000) >> 16)+chr((all_bin_crc & 0xFF000000) >> 24)).encode())
+    cmd = 'rm eagle.app.sym'
+    os.system(cmd)
+
+if __name__=='__main__':
+    gen_appbin()