diff --git a/Makefile b/Makefile
index a16f85ce..7de24a3b 100644
--- a/Makefile
+++ b/Makefile
@@ -75,7 +75,7 @@ else
     endif
 endif
 #############################################################
-ESPTOOL ?= ../tools/esptool.sh
+ESPTOOL ?= ../tools/esptool.py
 
 
 CSRCS ?= $(wildcard *.c)
diff --git a/tools/NOTICE b/tools/NOTICE
new file mode 100644
index 00000000..4a23662a
--- /dev/null
+++ b/tools/NOTICE
@@ -0,0 +1,3 @@
+The esptool.py.bak is from github.com/themadinventor/esptool.
+The esptool.py is converted fron python2 to python2/3 by futurize in the package future.
+
diff --git a/tools/esptool.py b/tools/esptool.py
index 130e80f0..cc661182 100755
--- a/tools/esptool.py
+++ b/tools/esptool.py
@@ -17,6 +17,13 @@
 # this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
 # Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
+from __future__ import division
+from __future__ import print_function
+from builtins import zip
+from builtins import chr
+from builtins import range
+from builtins import object
+from past.utils import old_div
 import sys
 import struct
 import serial
@@ -26,7 +33,7 @@ import argparse
 import os
 import subprocess
 
-class ESPROM:
+class ESPROM(object):
 
     # These are the currently known commands supported by the ROM
     ESP_FLASH_BEGIN = 0x02
@@ -123,12 +130,12 @@ class ESPROM:
     """ Perform a connection test """
     def sync(self):
         self.command(ESPROM.ESP_SYNC, '\x07\x07\x12\x20'+32*'\x55')
-        for i in xrange(7):
+        for i in range(7):
             self.command()
 
     """ Try connecting repeatedly until successful, or giving up """
     def connect(self):
-        print 'Connecting...'
+        print('Connecting...')
 
         # RTS = CH_PD (i.e reset)
         # DTR = GPIO0
@@ -139,7 +146,7 @@ class ESPROM:
         self._port.setDTR(False)
 
         self._port.timeout = 0.5
-        for i in xrange(10):
+        for i in range(10):
             try:
                 self._port.flushInput()
                 self._port.flushOutput()
@@ -184,7 +191,7 @@ class ESPROM:
     """ Start downloading to Flash (performs an erase) """
     def flash_begin(self, size, offset):
         old_tmo = self._port.timeout
-        num_blocks = (size + ESPROM.ESP_FLASH_BLOCK - 1) / ESPROM.ESP_FLASH_BLOCK
+        num_blocks = old_div((size + ESPROM.ESP_FLASH_BLOCK - 1), ESPROM.ESP_FLASH_BLOCK)
         self._port.timeout = 10
         if self.command(ESPROM.ESP_FLASH_BEGIN,
                 struct.pack('<IIII', size, num_blocks, ESPROM.ESP_FLASH_BLOCK, offset))[1] != "\0\0":
@@ -210,7 +217,7 @@ class ESPROM:
         self.flash_finish(reboot)
 
 
-class ESPFirmwareImage:
+class ESPFirmwareImage(object):
     
     def __init__(self, filename = None):
         self.segments = []
@@ -224,7 +231,7 @@ class ESPFirmwareImage:
             if magic != ESPROM.ESP_IMAGE_MAGIC or segments > 16:
                 raise Exception('Invalid firmware image')
         
-            for i in xrange(segments):
+            for i in range(segments):
                 (offset, size) = struct.unpack('<II', f.read(8))
                 if offset > 0x40200000 or offset < 0x3ffe0000 or size > 65536:
                     raise Exception('Suspicious segment %x,%d' % (offset, size))
@@ -259,7 +266,7 @@ class ESPFirmwareImage:
         f.write(struct.pack('B', checksum))
 
 
-class ELFFile:
+class ELFFile(object):
 
     def __init__(self, name):
         self.name = name
@@ -275,7 +282,7 @@ class ELFFile:
                 tool_nm = "xt-nm"
             proc = subprocess.Popen([tool_nm, self.name], stdout=subprocess.PIPE)
         except OSError:
-            print "Error calling "+tool_nm+", do you have Xtensa toolchain in PATH?"
+            print("Error calling "+tool_nm+", do you have Xtensa toolchain in PATH?")
             sys.exit(1)
         for l in proc.stdout:
             fields = l.strip().split()
@@ -386,38 +393,38 @@ if __name__ == '__main__':
     if args.operation == 'load_ram':
         image = ESPFirmwareImage(args.filename)
 
-        print 'RAM boot...'
+        print('RAM boot...')
         for (offset, size, data) in image.segments:
-            print 'Downloading %d bytes at %08x...' % (size, offset),
+            print('Downloading %d bytes at %08x...' % (size, offset), end=' ')
             sys.stdout.flush()
-            esp.mem_begin(size, math.ceil(size / float(esp.ESP_RAM_BLOCK)), esp.ESP_RAM_BLOCK, offset)
+            esp.mem_begin(size, math.ceil(old_div(size, float(esp.ESP_RAM_BLOCK))), esp.ESP_RAM_BLOCK, offset)
 
             seq = 0
             while len(data) > 0:
                 esp.mem_block(data[0:esp.ESP_RAM_BLOCK], seq)
                 data = data[esp.ESP_RAM_BLOCK:]
                 seq += 1
-            print 'done!'
+            print('done!')
 
-        print 'All segments done, executing at %08x' % image.entrypoint
+        print('All segments done, executing at %08x' % image.entrypoint)
         esp.mem_finish(image.entrypoint)
 
     elif args.operation == 'read_mem':
-        print '0x%08x = 0x%08x' % (args.address, esp.read_reg(args.address))
+        print('0x%08x = 0x%08x' % (args.address, esp.read_reg(args.address)))
 
     elif args.operation == 'write_mem':
         esp.write_reg(args.address, args.value, args.mask, 0)
-        print 'Wrote %08x, mask %08x to %08x' % (args.value, args.mask, args.address)
+        print('Wrote %08x, mask %08x to %08x' % (args.value, args.mask, args.address))
 
     elif args.operation == 'dump_mem':
         f = file(args.filename, 'wb')
-        for i in xrange(args.size/4):
+        for i in range(old_div(args.size,4)):
             d = esp.read_reg(args.address+(i*4))
             f.write(struct.pack('<I', d))
             if f.tell() % 1024 == 0:
-                print '\r%d bytes read... (%d %%)' % (f.tell(), f.tell()*100/args.size),
+                print('\r%d bytes read... (%d %%)' % (f.tell(), f.tell()*100/args.size), end=' ')
                 sys.stdout.flush()
-        print 'Done!'
+        print('Done!')
 
     elif args.operation == 'write_flash':
         assert len(args.addr_filename) % 2 == 0
@@ -426,20 +433,20 @@ if __name__ == '__main__':
             filename = args.addr_filename[1]
             args.addr_filename = args.addr_filename[2:]
             image = file(filename, 'rb').read()
-            print 'Erasing flash...'
-            blocks = math.ceil(len(image)/float(esp.ESP_FLASH_BLOCK))
+            print('Erasing flash...')
+            blocks = math.ceil(old_div(len(image),float(esp.ESP_FLASH_BLOCK)))
             esp.flash_begin(blocks*esp.ESP_FLASH_BLOCK, address)
             seq = 0
             while len(image) > 0:
-                print '\rWriting at 0x%08x... (%d %%)' % (address + seq*esp.ESP_FLASH_BLOCK, 100*(seq+1)/blocks),
+                print('\rWriting at 0x%08x... (%d %%)' % (address + seq*esp.ESP_FLASH_BLOCK, 100*(seq+1)/blocks), end=' ')
                 sys.stdout.flush()
                 block = image[0:esp.ESP_FLASH_BLOCK]
                 block = block + '\xe0' * (esp.ESP_FLASH_BLOCK-len(block))
                 esp.flash_block(block, seq)
                 image = image[esp.ESP_FLASH_BLOCK:]
                 seq += 1
-            print
-        print '\nLeaving...'
+            print()
+        print('\nLeaving...')
         esp.flash_finish(False)
 
     elif args.operation == 'run':
@@ -447,15 +454,15 @@ if __name__ == '__main__':
 
     elif args.operation == 'image_info':
         image = ESPFirmwareImage(args.filename)
-        print ('Entry point: %08x' % image.entrypoint) if image.entrypoint != 0 else 'Entry point not set'
-        print '%d segments' % len(image.segments)
-        print
+        print(('Entry point: %08x' % image.entrypoint) if image.entrypoint != 0 else 'Entry point not set')
+        print('%d segments' % len(image.segments))
+        print()
         checksum = ESPROM.ESP_CHECKSUM_MAGIC
         for (idx, (offset, size, data)) in enumerate(image.segments):
-            print 'Segment %d: %5d bytes at %08x' % (idx+1, size, offset)
+            print('Segment %d: %5d bytes at %08x' % (idx+1, size, offset))
             checksum = ESPROM.checksum(data, checksum)
-        print
-        print 'Checksum: %02x (%s)' % (image.checksum, 'valid' if image.checksum == checksum else 'invalid!')
+        print()
+        print('Checksum: %02x (%s)' % (image.checksum, 'valid' if image.checksum == checksum else 'invalid!'))
 
     elif args.operation == 'make_image':
         image = ESPFirmwareImage()
@@ -489,4 +496,4 @@ if __name__ == '__main__':
     elif args.operation == 'read_mac':
         mac0 = esp.read_reg(esp.ESP_OTP_MAC0)
         mac1 = esp.read_reg(esp.ESP_OTP_MAC1)
-        print 'MAC: 18:fe:34:%02x:%02x:%02x' % ((mac1 >> 8) & 0xff, mac1 & 0xff, (mac0 >> 24) & 0xff)
+        print('MAC: 18:fe:34:%02x:%02x:%02x' % ((mac1 >> 8) & 0xff, mac1 & 0xff, (mac0 >> 24) & 0xff))
diff --git a/tools/esptool.py.bak b/tools/esptool.py.bak
new file mode 100755
index 00000000..130e80f0
--- /dev/null
+++ b/tools/esptool.py.bak
@@ -0,0 +1,492 @@
+#!/usr/bin/env python
+#
+# ESP8266 ROM Bootloader Utility
+# https://github.com/themadinventor/esptool
+#
+# Copyright (C) 2014 Fredrik Ahlberg
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful, but WITHOUT 
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
+# Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+import sys
+import struct
+import serial
+import math
+import time
+import argparse
+import os
+import subprocess
+
+class ESPROM:
+
+    # These are the currently known commands supported by the ROM
+    ESP_FLASH_BEGIN = 0x02
+    ESP_FLASH_DATA  = 0x03
+    ESP_FLASH_END   = 0x04
+    ESP_MEM_BEGIN   = 0x05
+    ESP_MEM_END     = 0x06
+    ESP_MEM_DATA    = 0x07
+    ESP_SYNC        = 0x08
+    ESP_WRITE_REG   = 0x09
+    ESP_READ_REG    = 0x0a
+
+    # Maximum block sized for RAM and Flash writes, respectively.
+    ESP_RAM_BLOCK   = 0x1800
+    ESP_FLASH_BLOCK = 0x100
+
+    # Default baudrate. The ROM auto-bauds, so we can use more or less whatever we want.
+    ESP_ROM_BAUD    = 115200
+
+    # First byte of the application image
+    ESP_IMAGE_MAGIC = 0xe9
+
+    # Initial state for the checksum routine
+    ESP_CHECKSUM_MAGIC = 0xef
+
+    # OTP ROM addresses
+    ESP_OTP_MAC0    = 0x3ff00050
+    ESP_OTP_MAC1    = 0x3ff00054
+
+    def __init__(self, port = 0, baud = ESP_ROM_BAUD):
+        self._port = serial.Serial(port, baud)
+
+    """ Read bytes from the serial port while performing SLIP unescaping """
+    def read(self, length = 1):
+        b = ''
+        while len(b) < length:
+            c = self._port.read(1)
+            if c == '\xdb':
+                c = self._port.read(1)
+                if c == '\xdc':
+                    b = b + '\xc0'
+                elif c == '\xdd':
+                    b = b + '\xdb'
+                else:
+                    raise Exception('Invalid SLIP escape')
+            else:
+                b = b + c
+        return b
+
+    """ Write bytes to the serial port while performing SLIP escaping """
+    def write(self, packet):
+        buf = '\xc0'
+        for b in packet:
+            if b == '\xc0':
+                buf += '\xdb\xdc'
+            elif b == '\xdb':
+                buf += '\xdb\xdd'
+            else:
+                buf += b
+        buf += '\xc0'
+        self._port.write(buf)
+
+    """ Calculate checksum of a blob, as it is defined by the ROM """
+    @staticmethod
+    def checksum(data, state = ESP_CHECKSUM_MAGIC):
+        for b in data:
+            state ^= ord(b)
+        return state
+
+    """ Send a request and read the response """
+    def command(self, op = None, data = None, chk = 0):
+        if op:
+            # Construct and send request
+            pkt = struct.pack('<BBHI', 0x00, op, len(data), chk) + data
+            self.write(pkt)
+
+        # Read header of response and parse
+        if self._port.read(1) != '\xc0':
+            raise Exception('Invalid head of packet')
+        hdr = self.read(8)
+        (resp, op_ret, len_ret, val) = struct.unpack('<BBHI', hdr)
+        if resp != 0x01 or (op and op_ret != op):
+            raise Exception('Invalid response')
+
+        # The variable-length body
+        body = self.read(len_ret)
+
+        # Terminating byte
+        if self._port.read(1) != chr(0xc0):
+            raise Exception('Invalid end of packet')
+
+        return val, body
+
+    """ Perform a connection test """
+    def sync(self):
+        self.command(ESPROM.ESP_SYNC, '\x07\x07\x12\x20'+32*'\x55')
+        for i in xrange(7):
+            self.command()
+
+    """ Try connecting repeatedly until successful, or giving up """
+    def connect(self):
+        print 'Connecting...'
+
+        # RTS = CH_PD (i.e reset)
+        # DTR = GPIO0
+        self._port.setRTS(True)
+        self._port.setDTR(True)
+        self._port.setRTS(False)
+        time.sleep(0.1)
+        self._port.setDTR(False)
+
+        self._port.timeout = 0.5
+        for i in xrange(10):
+            try:
+                self._port.flushInput()
+                self._port.flushOutput()
+                self.sync()
+                self._port.timeout = 5
+                return
+            except:
+                time.sleep(0.1)
+        raise Exception('Failed to connect')
+
+    """ Read memory address in target """
+    def read_reg(self, addr):
+        res = self.command(ESPROM.ESP_READ_REG, struct.pack('<I', addr))
+        if res[1] != "\0\0":
+            raise Exception('Failed to read target memory')
+        return res[0]
+
+    """ Write to memory address in target """
+    def write_reg(self, addr, value, mask, delay_us = 0):
+        if self.command(ESPROM.ESP_WRITE_REG,
+                struct.pack('<IIII', addr, value, mask, delay_us))[1] != "\0\0":
+            raise Exception('Failed to write target memory')
+
+    """ Start downloading an application image to RAM """
+    def mem_begin(self, size, blocks, blocksize, offset):
+        if self.command(ESPROM.ESP_MEM_BEGIN,
+                struct.pack('<IIII', size, blocks, blocksize, offset))[1] != "\0\0":
+            raise Exception('Failed to enter RAM download mode')
+
+    """ Send a block of an image to RAM """
+    def mem_block(self, data, seq):
+        if self.command(ESPROM.ESP_MEM_DATA,
+                struct.pack('<IIII', len(data), seq, 0, 0)+data, ESPROM.checksum(data))[1] != "\0\0":
+            raise Exception('Failed to write to target RAM')
+
+    """ Leave download mode and run the application """
+    def mem_finish(self, entrypoint = 0):
+        if self.command(ESPROM.ESP_MEM_END,
+                struct.pack('<II', int(entrypoint == 0), entrypoint))[1] != "\0\0":
+            raise Exception('Failed to leave RAM download mode')
+
+    """ Start downloading to Flash (performs an erase) """
+    def flash_begin(self, size, offset):
+        old_tmo = self._port.timeout
+        num_blocks = (size + ESPROM.ESP_FLASH_BLOCK - 1) / ESPROM.ESP_FLASH_BLOCK
+        self._port.timeout = 10
+        if self.command(ESPROM.ESP_FLASH_BEGIN,
+                struct.pack('<IIII', size, num_blocks, ESPROM.ESP_FLASH_BLOCK, offset))[1] != "\0\0":
+            raise Exception('Failed to enter Flash download mode')
+        self._port.timeout = old_tmo
+
+    """ Write block to flash """
+    def flash_block(self, data, seq):
+        if self.command(ESPROM.ESP_FLASH_DATA,
+                struct.pack('<IIII', len(data), seq, 0, 0)+data, ESPROM.checksum(data))[1] != "\0\0":
+            raise Exception('Failed to write to target Flash')
+
+    """ Leave flash mode and run/reboot """
+    def flash_finish(self, reboot = False):
+        pkt = struct.pack('<I', int(not reboot))
+        if self.command(ESPROM.ESP_FLASH_END, pkt)[1] != "\0\0":
+            raise Exception('Failed to leave Flash mode')
+
+    """ Run application code in flash """
+    def run(self, reboot = False):
+        # Fake flash begin immediately followed by flash end
+        self.flash_begin(0, 0)
+        self.flash_finish(reboot)
+
+
+class ESPFirmwareImage:
+    
+    def __init__(self, filename = None):
+        self.segments = []
+        self.entrypoint = 0
+
+        if filename is not None:
+            f = file(filename, 'rb')
+            (magic, segments, _, _, self.entrypoint) = struct.unpack('<BBBBI', f.read(8))
+            
+            # some sanity check
+            if magic != ESPROM.ESP_IMAGE_MAGIC or segments > 16:
+                raise Exception('Invalid firmware image')
+        
+            for i in xrange(segments):
+                (offset, size) = struct.unpack('<II', f.read(8))
+                if offset > 0x40200000 or offset < 0x3ffe0000 or size > 65536:
+                    raise Exception('Suspicious segment %x,%d' % (offset, size))
+                self.segments.append((offset, size, f.read(size)))
+
+            # Skip the padding. The checksum is stored in the last byte so that the
+            # file is a multiple of 16 bytes.
+            align = 15-(f.tell() % 16)
+            f.seek(align, 1)
+
+            self.checksum = ord(f.read(1))
+
+    def add_segment(self, addr, data):
+        # Data should be aligned on word boundary
+        l = len(data)
+        if l % 4:
+            data += b"\x00" * (4 - l % 4)
+        self.segments.append((addr, len(data), data))
+
+    def save(self, filename):
+        f = file(filename, 'wb')
+        f.write(struct.pack('<BBBBI', ESPROM.ESP_IMAGE_MAGIC, len(self.segments), 0, 0, self.entrypoint))
+
+        checksum = ESPROM.ESP_CHECKSUM_MAGIC
+        for (offset, size, data) in self.segments:
+            f.write(struct.pack('<II', offset, size))
+            f.write(data)
+            checksum = ESPROM.checksum(data, checksum)
+
+        align = 15-(f.tell() % 16)
+        f.seek(align, 1)
+        f.write(struct.pack('B', checksum))
+
+
+class ELFFile:
+
+    def __init__(self, name):
+        self.name = name
+        self.symbols = None
+
+    def _fetch_symbols(self):
+        if self.symbols is not None:
+            return
+        self.symbols = {}
+        try:
+            tool_nm = "xtensa-lx106-elf-nm"
+            if os.getenv('XTENSA_CORE')=='lx106':
+                tool_nm = "xt-nm"
+            proc = subprocess.Popen([tool_nm, self.name], stdout=subprocess.PIPE)
+        except OSError:
+            print "Error calling "+tool_nm+", do you have Xtensa toolchain in PATH?"
+            sys.exit(1)
+        for l in proc.stdout:
+            fields = l.strip().split()
+            self.symbols[fields[2]] = int(fields[0], 16)
+
+    def get_symbol_addr(self, sym):
+        self._fetch_symbols()
+        return self.symbols[sym]
+
+    def load_section(self, section):
+        tool_objcopy = "xtensa-lx106-elf-objcopy"
+        if os.getenv('XTENSA_CORE')=='lx106':
+            tool_objcopy = "xt-objcopy"
+        subprocess.check_call([tool_objcopy, "--only-section", section, "-Obinary", self.name, ".tmp.section"])
+        f = open(".tmp.section", "rb")
+        data = f.read()
+        f.close()
+        os.remove(".tmp.section")
+        return data
+
+
+def arg_auto_int(x):
+    return int(x, 0)
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description = 'ESP8266 ROM Bootloader Utility', prog = 'esptool')
+
+    parser.add_argument(
+            '--port', '-p',
+            help = 'Serial port device',
+            default = '/dev/ttyUSB0')
+
+    parser.add_argument(
+            '--baud', '-b',
+            help = 'Serial port baud rate',
+            type = arg_auto_int,
+            default = ESPROM.ESP_ROM_BAUD)
+
+    subparsers = parser.add_subparsers(
+            dest = 'operation',
+            help = 'Run esptool {command} -h for additional help')
+
+    parser_load_ram = subparsers.add_parser(
+            'load_ram',
+            help = 'Download an image to RAM and execute')
+    parser_load_ram.add_argument('filename', help = 'Firmware image')
+
+    parser_dump_mem = subparsers.add_parser(
+            'dump_mem',
+            help = 'Dump arbitrary memory to disk')
+    parser_dump_mem.add_argument('address', help = 'Base address', type = arg_auto_int)
+    parser_dump_mem.add_argument('size', help = 'Size of region to dump', type = arg_auto_int)
+    parser_dump_mem.add_argument('filename', help = 'Name of binary dump')
+
+    parser_read_mem = subparsers.add_parser(
+            'read_mem',
+            help = 'Read arbitrary memory location')
+    parser_read_mem.add_argument('address', help = 'Address to read', type = arg_auto_int)
+
+    parser_write_mem = subparsers.add_parser(
+            'write_mem',
+            help = 'Read-modify-write to arbitrary memory location')
+    parser_write_mem.add_argument('address', help = 'Address to write', type = arg_auto_int)
+    parser_write_mem.add_argument('value', help = 'Value', type = arg_auto_int)
+    parser_write_mem.add_argument('mask', help = 'Mask of bits to write', type = arg_auto_int)
+
+    parser_write_flash = subparsers.add_parser(
+            'write_flash',
+            help = 'Write a binary blob to flash')
+    parser_write_flash.add_argument('addr_filename', nargs = '+', help = 'Address and binary file to write there, separated by space')
+
+    parser_run = subparsers.add_parser(
+            'run',
+            help = 'Run application code in flash')
+
+    parser_image_info = subparsers.add_parser(
+            'image_info',
+            help = 'Dump headers from an application image')
+    parser_image_info.add_argument('filename', help = 'Image file to parse')
+
+    parser_make_image = subparsers.add_parser(
+            'make_image',
+            help = 'Create an application image from binary files')
+    parser_make_image.add_argument('output', help = 'Output image file')
+    parser_make_image.add_argument('--segfile', '-f', action = 'append', help = 'Segment input file') 
+    parser_make_image.add_argument('--segaddr', '-a', action = 'append', help = 'Segment base address', type = arg_auto_int) 
+    parser_make_image.add_argument('--entrypoint', '-e', help = 'Address of entry point', type = arg_auto_int, default = 0)
+
+    parser_elf2image = subparsers.add_parser(
+            'elf2image',
+            help = 'Create an application image from ELF file')
+    parser_elf2image.add_argument('input', help = 'Input ELF file')
+    parser_elf2image.add_argument('--output', '-o', help = 'Output filename prefix', type = str)
+
+    parser_read_mac = subparsers.add_parser(
+            'read_mac',
+            help = 'Read MAC address from OTP ROM')
+
+    args = parser.parse_args()
+
+    # Create the ESPROM connection object, if needed
+    esp = None
+    if args.operation not in ('image_info','make_image','elf2image'):
+        esp = ESPROM(args.port, args.baud)
+        esp.connect()
+
+    # Do the actual work. Should probably be split into separate functions.
+    if args.operation == 'load_ram':
+        image = ESPFirmwareImage(args.filename)
+
+        print 'RAM boot...'
+        for (offset, size, data) in image.segments:
+            print 'Downloading %d bytes at %08x...' % (size, offset),
+            sys.stdout.flush()
+            esp.mem_begin(size, math.ceil(size / float(esp.ESP_RAM_BLOCK)), esp.ESP_RAM_BLOCK, offset)
+
+            seq = 0
+            while len(data) > 0:
+                esp.mem_block(data[0:esp.ESP_RAM_BLOCK], seq)
+                data = data[esp.ESP_RAM_BLOCK:]
+                seq += 1
+            print 'done!'
+
+        print 'All segments done, executing at %08x' % image.entrypoint
+        esp.mem_finish(image.entrypoint)
+
+    elif args.operation == 'read_mem':
+        print '0x%08x = 0x%08x' % (args.address, esp.read_reg(args.address))
+
+    elif args.operation == 'write_mem':
+        esp.write_reg(args.address, args.value, args.mask, 0)
+        print 'Wrote %08x, mask %08x to %08x' % (args.value, args.mask, args.address)
+
+    elif args.operation == 'dump_mem':
+        f = file(args.filename, 'wb')
+        for i in xrange(args.size/4):
+            d = esp.read_reg(args.address+(i*4))
+            f.write(struct.pack('<I', d))
+            if f.tell() % 1024 == 0:
+                print '\r%d bytes read... (%d %%)' % (f.tell(), f.tell()*100/args.size),
+                sys.stdout.flush()
+        print 'Done!'
+
+    elif args.operation == 'write_flash':
+        assert len(args.addr_filename) % 2 == 0
+        while args.addr_filename:
+            address = int(args.addr_filename[0], 0)
+            filename = args.addr_filename[1]
+            args.addr_filename = args.addr_filename[2:]
+            image = file(filename, 'rb').read()
+            print 'Erasing flash...'
+            blocks = math.ceil(len(image)/float(esp.ESP_FLASH_BLOCK))
+            esp.flash_begin(blocks*esp.ESP_FLASH_BLOCK, address)
+            seq = 0
+            while len(image) > 0:
+                print '\rWriting at 0x%08x... (%d %%)' % (address + seq*esp.ESP_FLASH_BLOCK, 100*(seq+1)/blocks),
+                sys.stdout.flush()
+                block = image[0:esp.ESP_FLASH_BLOCK]
+                block = block + '\xe0' * (esp.ESP_FLASH_BLOCK-len(block))
+                esp.flash_block(block, seq)
+                image = image[esp.ESP_FLASH_BLOCK:]
+                seq += 1
+            print
+        print '\nLeaving...'
+        esp.flash_finish(False)
+
+    elif args.operation == 'run':
+        esp.run()
+
+    elif args.operation == 'image_info':
+        image = ESPFirmwareImage(args.filename)
+        print ('Entry point: %08x' % image.entrypoint) if image.entrypoint != 0 else 'Entry point not set'
+        print '%d segments' % len(image.segments)
+        print
+        checksum = ESPROM.ESP_CHECKSUM_MAGIC
+        for (idx, (offset, size, data)) in enumerate(image.segments):
+            print 'Segment %d: %5d bytes at %08x' % (idx+1, size, offset)
+            checksum = ESPROM.checksum(data, checksum)
+        print
+        print 'Checksum: %02x (%s)' % (image.checksum, 'valid' if image.checksum == checksum else 'invalid!')
+
+    elif args.operation == 'make_image':
+        image = ESPFirmwareImage()
+        if len(args.segfile) == 0:
+            raise Exception('No segments specified')
+        if len(args.segfile) != len(args.segaddr):
+            raise Exception('Number of specified files does not match number of specified addresses')
+        for (seg, addr) in zip(args.segfile, args.segaddr):
+            data = file(seg, 'rb').read()
+            image.add_segment(addr, data)
+        image.entrypoint = args.entrypoint
+        image.save(args.output)
+
+    elif args.operation == 'elf2image':
+        if args.output is None:
+            args.output = args.input + '-'
+        e = ELFFile(args.input)
+        image = ESPFirmwareImage()
+        image.entrypoint = e.get_symbol_addr("call_user_start")
+        for section, start in ((".text", "_text_start"), (".data", "_data_start"), (".rodata", "_rodata_start")):
+            data = e.load_section(section)
+            image.add_segment(e.get_symbol_addr(start), data)
+        image.save(args.output + "0x00000.bin")
+        data = e.load_section(".irom0.text")
+        off = e.get_symbol_addr("_irom0_text_start") - 0x40200000
+        assert off >= 0
+        f = open(args.output + "0x%05x.bin" % off, "wb")
+        f.write(data)
+        f.close()
+
+    elif args.operation == 'read_mac':
+        mac0 = esp.read_reg(esp.ESP_OTP_MAC0)
+        mac1 = esp.read_reg(esp.ESP_OTP_MAC1)
+        print 'MAC: 18:fe:34:%02x:%02x:%02x' % ((mac1 >> 8) & 0xff, mac1 & 0xff, (mac0 >> 24) & 0xff)
diff --git a/tools/esptool.sh b/tools/esptool.sh
deleted file mode 100755
index d372c3fa..00000000
--- a/tools/esptool.sh
+++ /dev/null
@@ -1,16 +0,0 @@
-#!/bin/sh
-BASEDIR=$(dirname $(readlink -f "$0"))
-ret=`python -c 'import sys; print("%i" % (sys.hexversion<0x03000000))'`
-if [ $ret -eq 0 ]; then
-    #Retry python 2
-	ret=`python2 -c 'import sys; print("%i" % (sys.hexversion<0x03000000))'`
-	if [ $ret -eq 0 ]; then
-	    echo "Cannot find python2."
-	else 
-	    #Ok
-		python2 $BASEDIR/esptool.py $@
-	fi
-else 
-    #Ok
-	python $BASEDIR/esptool.py $@
-fi
\ No newline at end of file