IDF release/v3.2 d3e562907 (#3292)

tools/esptool.py

@@ -60,7 +60,7 @@ except ImportError:
           "Check the README for installation instructions." % (sys.VERSION, sys.executable))
     raise
 
-__version__ = "2.6"
+__version__ = "2.8-dev"
 
 MAX_UINT32 = 0xffffffff
 MAX_UINT24 = 0xffffff
@@ -135,6 +135,15 @@ except NameError:
     basestring = str
 
 
+def _mask_to_shift(mask):
+    """ Return the index of the least significant bit in the mask """
+    shift = 0
+    while mask & 0x1 == 0:
+        shift += 1
+        mask >>= 1
+    return shift
+
+
 def esp8266_function_only(func):
     """ Attribute for a function only supported on ESP8266 """
     return check_supported_function(func, lambda o: o.CHIP_NAME == "ESP8266")
@@ -180,6 +189,9 @@ class ESPLoader(object):
     ESP_READ_FLASH = 0xD2
     ESP_RUN_USER_CODE = 0xD3
 
+    # Flash encryption debug more command
+    ESP_FLASH_ENCRYPT_DATA = 0xD4
+
     # Maximum block sized for RAM and Flash writes, respectively.
     ESP_RAM_BLOCK   = 0x1800
 
@@ -197,8 +209,11 @@ class ESPLoader(object):
     # Flash sector size, minimum unit of erase.
     FLASH_SECTOR_SIZE = 0x1000
 
+    # This register happens to exist on both ESP8266 & ESP32
     UART_DATA_REG_ADDR = 0x60000078
 
+    UART_CLKDIV_MASK = 0xFFFFF
+
     # Memory addresses
     IROM_MAP_START = 0x40200000
     IROM_MAP_END = 0x40300000
@@ -467,8 +482,8 @@ class ESPLoader(object):
             print('')  # end 'Connecting...' line
         raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
 
-    """ Read memory address in target """
     def read_reg(self, addr):
+        """ Read memory address in target """
         # we don't call check_command here because read_reg() function is called
         # when detecting chip type, and the way we check for success (STATUS_BYTES_LENGTH) is different
         # for different chip types (!)
@@ -477,11 +492,28 @@ class ESPLoader(object):
             raise FatalError.WithResult("Failed to read register address %08x" % addr, data)
         return val
 
-    """ Write to memory address in target """
     def write_reg(self, addr, value, mask=0xFFFFFFFF, delay_us=0):
+        """ Write to memory address in target
+
+        Note: mask option is not supported by stub loaders, use update_reg() function.
+        """
         return self.check_command("write target memory", self.ESP_WRITE_REG,
                                   struct.pack('<IIII', addr, value, mask, delay_us))
 
+    def update_reg(self, addr, mask, new_val):
+        """ Update register at 'addr', replace the bits masked out by 'mask'
+        with new_val. new_val is shifted left to match the LSB of 'mask'
+
+        Returns just-written value of register.
+        """
+        shift = _mask_to_shift(mask)
+        val = self.read_reg(addr)
+        val &= ~mask
+        val |= (new_val << shift) & mask
+        self.write_reg(addr, val)
+
+        return val
+
     """ Start downloading an application image to RAM """
     def mem_begin(self, size, blocks, blocksize, offset):
         if self.IS_STUB:  # check we're not going to overwrite a running stub with this data
@@ -549,6 +581,14 @@ class ESPLoader(object):
                            self.checksum(data),
                            timeout=timeout)
 
+    """ Encrypt before writing to flash """
+    def flash_encrypt_block(self, data, seq, timeout=DEFAULT_TIMEOUT):
+        self.check_command("Write encrypted to target Flash after seq %d" % seq,
+                           self.ESP_FLASH_ENCRYPT_DATA,
+                           struct.pack('<IIII', len(data), seq, 0, 0) + data,
+                           self.checksum(data),
+                           timeout=timeout)
+
     """ Leave flash mode and run/reboot """
     def flash_finish(self, reboot=False):
         pkt = struct.pack('<I', int(not reboot))
@@ -706,6 +746,7 @@ class ESPLoader(object):
             progress_fn(len(data), length)
         if len(data) > length:
             raise FatalError('Read more than expected')
+
         digest_frame = self.read()
         if len(digest_frame) != 16:
             raise FatalError('Expected digest, got: %s' % hexify(digest_frame))
@@ -899,6 +940,22 @@ class ESPLoader(object):
 
         self.run_spiflash_command(SPIFLASH_WRDI)
 
+    def get_crystal_freq(self):
+        # Figure out the crystal frequency from the UART clock divider
+        # Returns a normalized value in integer MHz (40 or 26 are the only supported values)
+        #
+        # The logic here is:
+        # - We know that our baud rate and the ESP UART baud rate are roughly the same, or we couldn't communicate
+        # - We can read the UART clock divider register to know how the ESP derives this from the APB bus frequency
+        # - Multiplying these two together gives us the bus frequency which is either the crystal frequency (ESP32)
+        #   or double the crystal frequency (ESP8266). See the self.XTAL_CLK_DIVIDER parameter for this factor.
+        uart_div = self.read_reg(self.UART_CLKDIV_REG) & self.UART_CLKDIV_MASK
+        est_xtal = (self._port.baudrate * uart_div) / 1e6 / self.XTAL_CLK_DIVIDER
+        norm_xtal = 40 if est_xtal > 33 else 26
+        if abs(norm_xtal - est_xtal) > 1:
+            print("WARNING: Detected crystal freq %.2fMHz is quite different to normalized freq %dMHz. Unsupported crystal in use?" % (est_xtal, norm_xtal))
+        return norm_xtal
+
     def hard_reset(self):
         self._setRTS(True)  # EN->LOW
         time.sleep(0.1)
@@ -943,6 +1000,10 @@ class ESP8266ROM(ESPLoader):
     SPI_W0_OFFS     = 0x40
     SPI_HAS_MOSI_DLEN_REG = False
 
+    UART_CLKDIV_REG = 0x60000014
+
+    XTAL_CLK_DIVIDER = 2
+
     FLASH_SIZES = {
         '512KB':0x00,
         '256KB':0x10,
@@ -957,6 +1018,11 @@ class ESP8266ROM(ESPLoader):
 
     BOOTLOADER_FLASH_OFFSET = 0
 
+    MEMORY_MAP = [[0x3FF00000, 0x3FF00010, "DPORT"],
+                  [0x3FFE8000, 0x40000000, "DRAM"],
+                  [0x40100000, 0x40108000, "IRAM"],
+                  [0x40201010, 0x402E1010, "IROM"]]
+
     def get_efuses(self):
         # Return the 128 bits of ESP8266 efuse as a single Python integer
         return (self.read_reg(0x3ff0005c) << 96 |
@@ -1055,6 +1121,7 @@ class ESP32ROM(ESPLoader):
 
     """
     CHIP_NAME = "ESP32"
+    IMAGE_CHIP_ID = 0
     IS_STUB = False
 
     DATE_REG_VALUE = 0x15122500
@@ -1070,9 +1137,15 @@ class ESP32ROM(ESPLoader):
     SPI_REG_BASE   = 0x60002000
     EFUSE_REG_BASE = 0x6001a000
 
+    DR_REG_SYSCON_BASE = 0x3ff66000
+
     SPI_W0_OFFS = 0x80
     SPI_HAS_MOSI_DLEN_REG = True
 
+    UART_CLKDIV_REG = 0x3ff40014
+
+    XTAL_CLK_DIVIDER = 1
+
     FLASH_SIZES = {
         '1MB':0x00,
         '2MB':0x10,
@@ -1085,9 +1158,77 @@ class ESP32ROM(ESPLoader):
 
     OVERRIDE_VDDSDIO_CHOICES = ["1.8V", "1.9V", "OFF"]
 
+    MEMORY_MAP = [[0x3F400000, 0x3F800000, "DROM"],
+                  [0x3F800000, 0x3FC00000, "EXTRAM_DATA"],
+                  [0x3FF80000, 0x3FF82000, "RTC_DRAM"],
+                  [0x3FF90000, 0x40000000, "BYTE_ACCESSIBLE"],
+                  [0x3FFAE000, 0x40000000, "DRAM"],
+                  [0x3FFAE000, 0x40000000, "DMA"],
+                  [0x3FFE0000, 0x3FFFFFFC, "DIRAM_DRAM"],
+                  [0x40000000, 0x40070000, "IROM"],
+                  [0x40070000, 0x40078000, "CACHE_PRO"],
+                  [0x40078000, 0x40080000, "CACHE_APP"],
+                  [0x40080000, 0x400A0000, "IRAM"],
+                  [0x400A0000, 0x400BFFFC, "DIRAM_IRAM"],
+                  [0x400C0000, 0x400C2000, "RTC_IRAM"],
+                  [0x400D0000, 0x40400000, "IROM"],
+                  [0x50000000, 0x50002000, "RTC_DATA"]]
+
+    """ Try to read the BLOCK1 (encryption key) and check if it is valid """
+
+    def is_flash_encryption_key_valid(self):
+
+        """ Bit 0 of efuse_rd_disable[3:0] is mapped to BLOCK1
+        this bit is at position 16 in EFUSE_BLK0_RDATA0_REG """
+        word0 = self.read_efuse(0)
+        rd_disable = (word0 >> 16) & 0x1
+
+        # reading of BLOCK1 is NOT ALLOWED so we assume valid key is programmed
+        if rd_disable:
+            return True
+        else:
+            """ reading of BLOCK1 is ALLOWED so we will read and verify for non-zero.
+            When ESP32 has not generated AES/encryption key in BLOCK1, the contents will be readable and 0.
+            If the flash encryption is enabled it is expected to have a valid non-zero key. We break out on
+            first occurance of non-zero value """
+            key_word = [0] * 7
+            for i in range(len(key_word)):
+                key_word[i] = self.read_efuse(14 + i)
+                # key is non-zero so break & return
+                if key_word[i] != 0:
+                    return True
+            return False
+
+    """ For flash encryption related commands we need to make sure
+    user has programmed all the relevant efuse correctly so at
+    the end of write_flash_encrypt esptool will verify the values
+    of flash_crypt_config to be non zero if they are not read
+    protected. If the values are zero a warning will be printed
+    """
+
+    def get_flash_crypt_config(self):
+        """ bit 3 in efuse_rd_disable[3:0] is mapped to flash_crypt_config
+        this bit is at position 19 in EFUSE_BLK0_RDATA0_REG """
+        word0 = self.read_efuse(0)
+        rd_disable = (word0 >> 19) & 0x1
+
+        if rd_disable == 0:
+            """ we can read the flash_crypt_config efuse value
+            so go & read it (EFUSE_BLK0_RDATA5_REG[31:28]) """
+            word5 = self.read_efuse(5)
+            word5 = (word5 >> 28) & 0xF
+            return word5
+        else:
+            # if read of the efuse is disabled we assume it is set correctly
+            return 0xF
+
     def get_chip_description(self):
         word3 = self.read_efuse(3)
-        chip_ver_rev1 = (word3 >> 15) & 0x1
+        word5 = self.read_efuse(5)
+        apb_ctl_date = self.read_reg(self.DR_REG_SYSCON_BASE + 0x7C)
+        rev_bit0 = (word3 >> 15) & 0x1
+        rev_bit1 = (word5 >> 20) & 0x1
+        rev_bit2 = (apb_ctl_date >> 31) & 0x1
         pkg_version = (word3 >> 9) & 0x07
 
         chip_name = {
@@ -1097,7 +1238,16 @@ class ESP32ROM(ESPLoader):
             5: "ESP32-PICO-D4",
         }.get(pkg_version, "unknown ESP32")
 
-        return "%s (revision %d)" % (chip_name, chip_ver_rev1)
+        chip_revision = 0
+        if rev_bit0:
+            if rev_bit1:
+                if rev_bit2:
+                    chip_revision = 3
+                else:
+                    chip_revision = 2
+            else:
+                chip_revision = 1
+        return "%s (revision %d)" % (chip_name, chip_revision)
 
     def get_chip_features(self):
         features = ["WiFi"]
@@ -1298,11 +1448,11 @@ class BaseFirmwareImage(object):
         self.elf_sha256_offset = 0
 
     def load_common_header(self, load_file, expected_magic):
-            (magic, segments, self.flash_mode, self.flash_size_freq, self.entrypoint) = struct.unpack('<BBBBI', load_file.read(8))
+        (magic, segments, self.flash_mode, self.flash_size_freq, self.entrypoint) = struct.unpack('<BBBBI', load_file.read(8))
 
-            if magic != expected_magic:
-                raise FatalError('Invalid firmware image magic=0x%x' % (magic))
-            return segments
+        if magic != expected_magic:
+            raise FatalError('Invalid firmware image magic=0x%x' % (magic))
+        return segments
 
     def verify(self):
         if len(self.segments) > 16:
@@ -1328,16 +1478,19 @@ class BaseFirmwareImage(object):
     def maybe_patch_segment_data(self, f, segment_data):
         """If SHA256 digest of the ELF file needs to be inserted into this segment, do so. Returns segment data."""
         segment_len = len(segment_data)
-        file_pos = f.tell()
+        file_pos = f.tell()  # file_pos is position in the .bin file
         if self.elf_sha256_offset >= file_pos and self.elf_sha256_offset < file_pos + segment_len:
-            # SHA256 digest needs to be patched into this segment,
-            # calculate offset of the digest inside the segment.
+            # SHA256 digest needs to be patched into this binary segment,
+            # calculate offset of the digest inside the binary segment.
             patch_offset = self.elf_sha256_offset - file_pos
             # Sanity checks
             if patch_offset < self.SEG_HEADER_LEN or patch_offset + self.SHA256_DIGEST_LEN > segment_len:
-                raise FatalError('Can not place SHA256 digest on segment boundary' +
+                raise FatalError('Cannot place SHA256 digest on segment boundary' +
                                  '(elf_sha256_offset=%d, file_pos=%d, segment_size=%d)' %
                                  (self.elf_sha256_offset, file_pos, segment_len))
+            if segment_data[patch_offset:patch_offset + self.SHA256_DIGEST_LEN] != b'\x00' * self.SHA256_DIGEST_LEN:
+                raise FatalError('Contents of segment at SHA256 digest offset 0x%x are not all zero. Refusing to overwrite.' %
+                                 self.elf_sha256_offset)
             assert(len(self.elf_sha256) == self.SHA256_DIGEST_LEN)
             # offset relative to the data part
             patch_offset -= self.SEG_HEADER_LEN
@@ -1386,12 +1539,12 @@ class BaseFirmwareImage(object):
         return ESP8266ROM.IROM_MAP_START <= addr < ESP8266ROM.IROM_MAP_END
 
     def get_irom_segment(self):
-            irom_segments = [s for s in self.segments if self.is_irom_addr(s.addr)]
-            if len(irom_segments) > 0:
-                if len(irom_segments) != 1:
-                    raise FatalError('Found %d segments that could be irom0. Bad ELF file?' % len(irom_segments))
-                return irom_segments[0]
-            return None
+        irom_segments = [s for s in self.segments if self.is_irom_addr(s.addr)]
+        if len(irom_segments) > 0:
+            if len(irom_segments) != 1:
+                raise FatalError('Found %d segments that could be irom0. Bad ELF file?' % len(irom_segments))
+            return irom_segments[0]
+        return None
 
     def get_non_irom_segments(self):
         irom_segment = self.get_irom_segment()
@@ -1440,6 +1593,9 @@ class ESP8266ROMFirmwareImage(BaseFirmwareImage):
             self.append_checksum(f, checksum)
 
 
+ESP8266ROM.BOOTLOADER_IMAGE = ESP8266ROMFirmwareImage
+
+
 class ESP8266V2FirmwareImage(BaseFirmwareImage):
     """ 'Version 2' firmware image, segments loaded by software bootloader stub
         (ie Espressif bootloader or rboot)
@@ -1558,7 +1714,7 @@ class ESP32FirmwareImage(BaseFirmwareImage):
     # to be set to this value so ROM bootloader will skip it.
     WP_PIN_DISABLED = 0xEE
 
-    EXTENDED_HEADER_STRUCT_FMT = "B" * 16
+    EXTENDED_HEADER_STRUCT_FMT = "<BBBBHB" + ("B" * 8) + "B"
 
     IROM_ALIGN = 65536
 
@@ -1576,6 +1732,7 @@ class ESP32FirmwareImage(BaseFirmwareImage):
         self.cs_drv = 0
         self.hd_drv = 0
         self.wp_drv = 0
+        self.min_rev = 0
 
         self.append_digest = True
 
@@ -1745,15 +1902,21 @@ class ESP32FirmwareImage(BaseFirmwareImage):
         self.d_drv, self.cs_drv = split_byte(fields[2])
         self.hd_drv, self.wp_drv = split_byte(fields[3])
 
-        if fields[15] in [0, 1]:
-            self.append_digest = (fields[15] == 1)
-        else:
-            raise RuntimeError("Invalid value for append_digest field (0x%02x). Should be 0 or 1.", fields[15])
+        chip_id = fields[4]
+        if chip_id != self.ROM_LOADER.IMAGE_CHIP_ID:
+            print("Unexpected chip id in image. Expected %d but value was %d. Is this image for a different chip model?" % (self.ROM_LOADER.IMAGE_CHIP_ID, chip_id))
 
-        # remaining fields in the middle should all be zero
-        if any(f for f in fields[4:15] if f != 0):
+        # reserved fields in the middle should all be zero
+        if any(f for f in fields[6:-1] if f != 0):
             print("Warning: some reserved header fields have non-zero values. This image may be from a newer esptool.py?")
 
+        append_digest = fields[-1]  # last byte is append_digest
+        if append_digest in [0, 1]:
+            self.append_digest = (append_digest == 1)
+        else:
+            raise RuntimeError("Invalid value for append_digest field (0x%02x). Should be 0 or 1.", append_digest)
+
+
     def save_extended_header(self, save_file):
         def join_byte(ln,hn):
             return (ln & 0x0F) + ((hn & 0x0F) << 4)
@@ -1763,14 +1926,19 @@ class ESP32FirmwareImage(BaseFirmwareImage):
         fields = [self.wp_pin,
                   join_byte(self.clk_drv, self.q_drv),
                   join_byte(self.d_drv, self.cs_drv),
-                  join_byte(self.hd_drv, self.wp_drv)]
-        fields += [0] * 11
+                  join_byte(self.hd_drv, self.wp_drv),
+                  self.ROM_LOADER.IMAGE_CHIP_ID,
+                  self.min_rev]
+        fields += [0] * 8  # padding
         fields += [append_digest]
 
         packed = struct.pack(self.EXTENDED_HEADER_STRUCT_FMT, *fields)
         save_file.write(packed)
 
 
+ESP32ROM.BOOTLOADER_IMAGE = ESP32FirmwareImage
+
+
 class ELFFile(object):
     SEC_TYPE_PROGBITS = 0x01
     SEC_TYPE_STRTAB = 0x03
@@ -2087,8 +2255,26 @@ def _update_image_flash_params(esp, address, args, image):
 
     # unpack the (potential) image header
     magic, _, flash_mode, flash_size_freq = struct.unpack("BBBB", image[:4])
-    if address != esp.BOOTLOADER_FLASH_OFFSET or magic != esp.ESP_IMAGE_MAGIC:
-        return image  # not flashing a bootloader, so don't modify this
+    if address != esp.BOOTLOADER_FLASH_OFFSET:
+        return image  # not flashing bootloader offset, so don't modify this
+
+    if (args.flash_mode, args.flash_freq, args.flash_size) == ('keep',) * 3:
+        return image  # all settings are 'keep', not modifying anything
+
+    # easy check if this is an image: does it start with a magic byte?
+    if magic != esp.ESP_IMAGE_MAGIC:
+        print("Warning: Image file at 0x%x doesn't look like an image file, so not changing any flash settings." % address)
+        return image
+
+    # make sure this really is an image, and not just data that
+    # starts with esp.ESP_IMAGE_MAGIC (mostly a problem for encrypted
+    # images that happen to start with a magic byte
+    try:
+        test_image = esp.BOOTLOADER_IMAGE(io.BytesIO(image))
+        test_image.verify()
+    except Exception:
+        print("Warning: Image file at 0x%x is not a valid %s image, so not changing any flash settings." % (address,esp.CHIP_NAME))
+        return image
 
     if args.flash_mode != 'keep':
         flash_mode = {'qio':0, 'qout':1, 'dio':2, 'dout': 3}[args.flash_mode]
@@ -2115,23 +2301,53 @@ def write_flash(esp, args):
     if args.compress is None and not args.no_compress:
         args.compress = not args.no_stub
 
+    # For encrypt option we do few sanity checks before actual flash write
+    if args.encrypt:
+        do_write = True
+        crypt_cfg_efuse = esp.get_flash_crypt_config()
+
+        if crypt_cfg_efuse != 0xF:
+            print('\nWARNING: Unexpected FLASH_CRYPT_CONFIG value', hex(crypt_cfg_efuse))
+            print('\nMake sure flash encryption is enabled correctly, refer to Flash Encryption documentation')
+            do_write = False
+
+        enc_key_valid = esp.is_flash_encryption_key_valid()
+
+        if not enc_key_valid:
+            print('\nFlash encryption key is not programmed')
+            print('\nMake sure flash encryption is enabled correctly, refer to Flash Encryption documentation')
+            do_write = False
+
+        if (esp.FLASH_WRITE_SIZE % 32) != 0:
+            print('\nWARNING - Flash write address is not aligned to the recommeded 32 bytes')
+            do_write = False
+
+        if not do_write and not args.ignore_flash_encryption_efuse_setting:
+            raise FatalError("Incorrect efuse setting: aborting flash write")
+
     # verify file sizes fit in flash
-    flash_end = flash_size_bytes(args.flash_size)
-    for address, argfile in args.addr_filename:
-        argfile.seek(0,2)  # seek to end
-        if address + argfile.tell() > flash_end:
-            raise FatalError(("File %s (length %d) at offset %d will not fit in %d bytes of flash. " +
-                             "Use --flash-size argument, or change flashing address.")
-                             % (argfile.name, argfile.tell(), address, flash_end))
-        argfile.seek(0)
+    if args.flash_size != 'keep':  # TODO: check this even with 'keep'
+        flash_end = flash_size_bytes(args.flash_size)
+        for address, argfile in args.addr_filename:
+            argfile.seek(0,2)  # seek to end
+            if address + argfile.tell() > flash_end:
+                raise FatalError(("File %s (length %d) at offset %d will not fit in %d bytes of flash. " +
+                                  "Use --flash-size argument, or change flashing address.")
+                                 % (argfile.name, argfile.tell(), address, flash_end))
+            argfile.seek(0)
 
     if args.erase_all:
         erase_flash(esp, args)
 
+    if args.encrypt and args.compress:
+        print('\nWARNING: - compress and encrypt options are mutually exclusive ')
+        print('Will flash uncompressed')
+        args.compress = False
+
     for address, argfile in args.addr_filename:
         if args.no_stub:
             print('Erasing flash...')
-        image = pad_to(argfile.read(), 4)
+        image = pad_to(argfile.read(), 32 if args.encrypt else 4)
         if len(image) == 0:
             print('WARNING: File %s is empty' % argfile.name)
             continue
@@ -2159,7 +2375,10 @@ def write_flash(esp, args):
             else:
                 # Pad the last block
                 block = block + b'\xff' * (esp.FLASH_WRITE_SIZE - len(block))
-                esp.flash_block(block, seq)
+                if args.encrypt:
+                    esp.flash_encrypt_block(block, seq)
+                else:
+                    esp.flash_block(block, seq)
             image = image[esp.FLASH_WRITE_SIZE:]
             seq += 1
             written += len(block)
@@ -2173,17 +2392,19 @@ def write_flash(esp, args):
             if t > 0.0:
                 speed_msg = " (%.1f kbit/s)" % (written / t * 8 / 1000)
             print('\rWrote %d bytes at 0x%08x in %.1f seconds%s...' % (written, address, t, speed_msg))
-        try:
-            res = esp.flash_md5sum(address, uncsize)
-            if res != calcmd5:
-                print('File  md5: %s' % calcmd5)
-                print('Flash md5: %s' % res)
-                print('MD5 of 0xFF is %s' % (hashlib.md5(b'\xFF' * uncsize).hexdigest()))
-                raise FatalError("MD5 of file does not match data in flash!")
-            else:
-                print('Hash of data verified.')
-        except NotImplementedInROMError:
-            pass
+
+        if not args.encrypt:
+            try:
+                res = esp.flash_md5sum(address, uncsize)
+                if res != calcmd5:
+                    print('File  md5: %s' % calcmd5)
+                    print('Flash md5: %s' % res)
+                    print('MD5 of 0xFF is %s' % (hashlib.md5(b'\xFF' * uncsize).hexdigest()))
+                    raise FatalError("MD5 of file does not match data in flash!")
+                else:
+                    print('Hash of data verified.')
+            except NotImplementedInROMError:
+                pass
 
     print('\nLeaving...')
 
@@ -2207,11 +2428,12 @@ def image_info(args):
     print('Image version: %d' % image.version)
     print('Entry point: %08x' % image.entrypoint if image.entrypoint != 0 else 'Entry point not set')
     print('%d segments' % len(image.segments))
-    print
+    print()
     idx = 0
     for seg in image.segments:
         idx += 1
-        print('Segment %d: %r' % (idx, seg))
+        seg_name = ", ".join([seg_range[2] for seg_range in image.ROM_LOADER.MEMORY_MAP if seg_range[0] <= seg.addr < seg_range[1]])
+        print('Segment %d: %r [%s]' % (idx, seg, seg_name))
     calc_checksum = image.calculate_checksum()
     print('Checksum: %02x (%s)' % (image.checksum,
                                    'valid' if image.checksum == calc_checksum else 'invalid - calculated %02x' % calc_checksum))
@@ -2249,6 +2471,7 @@ def elf2image(args):
     if args.chip == 'esp32':
         image = ESP32FirmwareImage()
         image.secure_pad = args.secure_pad
+        image.min_rev = int(args.min_rev)
     elif args.version == '1':  # ESP8266
         image = ESP8266ROMFirmwareImage()
     else:
@@ -2397,7 +2620,8 @@ def main(custom_commandline=None):
     Main function for esptool
 
     custom_commandline - Optional override for default arguments parsing (that uses sys.argv), can be a list of custom arguments
-    as strings.
+    as strings. Arguments and their values need to be added as individual items to the list e.g. "-b 115200" thus
+    becomes ['-b', '115200'].
     """
     parser = argparse.ArgumentParser(description='esptool.py v%s - ESP8266 ROM Bootloader Utility' % __version__, prog='esptool')
 
@@ -2483,6 +2707,11 @@ def main(custom_commandline=None):
         extra_keep_args = [] if is_elf2image else ['keep']
         auto_detect = not is_elf2image
 
+        if auto_detect:
+            extra_fs_message = ", detect, or keep"
+        else:
+            extra_fs_message = ""
+
         parent.add_argument('--flash_freq', '-ff', help='SPI Flash frequency',
                             choices=extra_keep_args + ['40m', '26m', '20m', '80m'],
                             default=os.environ.get('ESPTOOL_FF', '40m' if is_elf2image else 'keep'))
@@ -2490,12 +2719,15 @@ def main(custom_commandline=None):
                             choices=extra_keep_args + ['qio', 'qout', 'dio', 'dout'],
                             default=os.environ.get('ESPTOOL_FM', 'qio' if is_elf2image else 'keep'))
         parent.add_argument('--flash_size', '-fs', help='SPI Flash size in MegaBytes (1MB, 2MB, 4MB, 8MB, 16M)'
-                            ' plus ESP8266-only (256KB, 512KB, 2MB-c1, 4MB-c1)',
+                            ' plus ESP8266-only (256KB, 512KB, 2MB-c1, 4MB-c1)' + extra_fs_message,
                             action=FlashSizeAction, auto_detect=auto_detect,
                             default=os.environ.get('ESPTOOL_FS', 'detect' if auto_detect else '1MB'))
         add_spi_connection_arg(parent)
 
-    parser_write_flash = subparsers.add_parser('write_flash', help='Write a binary blob to flash')
+    parser_write_flash = subparsers.add_parser(
+        'write_flash',
+        help='Write a binary blob to flash')
+
     parser_write_flash.add_argument('addr_filename', metavar='<address> <filename>', help='Address followed by binary filename, separated by space',
                                     action=AddrFilenamePairAction)
     parser_write_flash.add_argument('--erase-all', '-e',
@@ -2506,6 +2738,10 @@ def main(custom_commandline=None):
     parser_write_flash.add_argument('--no-progress', '-p', help='Suppress progress output', action="store_true")
     parser_write_flash.add_argument('--verify', help='Verify just-written data on flash ' +
                                     '(mostly superfluous, data is read back during flashing)', action='store_true')
+    parser_write_flash.add_argument('--encrypt', help='Encrypt before write ',
+                                    action='store_true')
+    parser_write_flash.add_argument('--ignore-flash-encryption-efuse-setting', help='Ignore flash encryption efuse settings ',
+                                    action='store_true')
 
     compress_args = parser_write_flash.add_mutually_exclusive_group(required=False)
     compress_args.add_argument('--compress', '-z', help='Compress data in transfer (default unless --no-stub is specified)',action="store_true", default=None)
@@ -2534,6 +2770,7 @@ def main(custom_commandline=None):
     parser_elf2image.add_argument('input', help='Input ELF file')
     parser_elf2image.add_argument('--output', '-o', help='Output filename prefix (for version 1 image), or filename (for version 2 single image)', type=str)
     parser_elf2image.add_argument('--version', '-e', help='Output image version', choices=['1','2'], default='1')
+    parser_elf2image.add_argument('--min-rev', '-r', help='Minimum chip revision', choices=['0','1','2','3'], default='0')
     parser_elf2image.add_argument('--secure-pad', action='store_true', help='Pad image so once signed it will end on a 64KB boundary. For ESP32 images only.')
     parser_elf2image.add_argument('--elf-sha256-offset', help='If set, insert SHA256 hash (32 bytes) of the input ELF file at specified offset in the binary.',
                                   type=arg_auto_int, default=None)
@@ -2658,12 +2895,14 @@ def main(custom_commandline=None):
                 print("%s failed to connect: %s" % (each_port, err))
                 esp = None
         if esp is None:
-            raise FatalError("All of the %d available serial ports could not connect to a Espressif device." % len(ser_list))
+            raise FatalError("Could not connect to an Espressif device on any of the %d available serial ports." % len(ser_list))
 
         print("Chip is %s" % (esp.get_chip_description()))
 
         print("Features: %s" % ", ".join(esp.get_chip_features()))
 
+        print("Crystal is %dMHz" % esp.get_crystal_freq())
+
         read_mac(esp, args)
 
         if not args.no_stub:
@@ -2692,7 +2931,8 @@ def main(custom_commandline=None):
         if hasattr(args, "flash_size"):
             print("Configuring flash size...")
             detect_flash_size(esp, args)
-            esp.flash_set_parameters(flash_size_bytes(args.flash_size))
+            if args.flash_size != 'keep':  # TODO: should set this even with 'keep'
+                esp.flash_set_parameters(flash_size_bytes(args.flash_size))
 
         try:
             operation_func(esp, args)
@@ -2775,6 +3015,7 @@ class FlashSizeAction(argparse.Action):
         known_sizes.update(ESP32ROM.FLASH_SIZES)
         if self._auto_detect:
             known_sizes['detect'] = 'detect'
+            known_sizes['keep'] = 'keep'
         if value not in known_sizes:
             raise argparse.ArgumentError(self, '%s is not a known flash size. Known sizes: %s' % (value, ", ".join(known_sizes.keys())))
         setattr(namespace, self.dest, value)
@@ -2846,104 +3087,105 @@ class AddrFilenamePairAction(argparse.Action):
 
 # Binary stub code (see flasher_stub dir for source & details)
 ESP8266ROM.STUB_CODE = eval(zlib.decompress(base64.b64decode(b"""
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 """)))
 ESP32ROM.STUB_CODE = eval(zlib.decompress(base64.b64decode(b"""
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