diff --git a/platform.txt b/platform.txt
index 0bea5903a3b..a88a12cabab 100644
--- a/platform.txt
+++ b/platform.txt
@@ -22,7 +22,7 @@ compiler.warning_flags.all=-Wall -Werror=all -Wextra
 
 compiler.path={runtime.tools.xtensa-esp32-elf-gcc.path}/bin/
 compiler.sdk.path={runtime.platform.path}/tools/sdk
-compiler.cpreprocessor.flags=-DESP_PLATFORM -DMBEDTLS_CONFIG_FILE="mbedtls/esp_config.h" -DHAVE_CONFIG_H "-I{compiler.sdk.path}/include/config" "-I{compiler.sdk.path}/include/app_trace" "-I{compiler.sdk.path}/include/app_update" "-I{compiler.sdk.path}/include/asio" "-I{compiler.sdk.path}/include/bootloader_support" "-I{compiler.sdk.path}/include/bt" "-I{compiler.sdk.path}/include/coap" "-I{compiler.sdk.path}/include/console" "-I{compiler.sdk.path}/include/driver" "-I{compiler.sdk.path}/include/esp-tls" "-I{compiler.sdk.path}/include/esp32" "-I{compiler.sdk.path}/include/esp_adc_cal" "-I{compiler.sdk.path}/include/esp_event" "-I{compiler.sdk.path}/include/esp_http_client" "-I{compiler.sdk.path}/include/esp_http_server" "-I{compiler.sdk.path}/include/esp_https_ota" "-I{compiler.sdk.path}/include/esp_ringbuf" "-I{compiler.sdk.path}/include/ethernet" "-I{compiler.sdk.path}/include/expat" "-I{compiler.sdk.path}/include/fatfs" "-I{compiler.sdk.path}/include/freemodbus" "-I{compiler.sdk.path}/include/freertos" "-I{compiler.sdk.path}/include/heap" "-I{compiler.sdk.path}/include/idf_test" "-I{compiler.sdk.path}/include/jsmn" "-I{compiler.sdk.path}/include/json" "-I{compiler.sdk.path}/include/libsodium" "-I{compiler.sdk.path}/include/log" "-I{compiler.sdk.path}/include/lwip" "-I{compiler.sdk.path}/include/mbedtls" "-I{compiler.sdk.path}/include/mdns" "-I{compiler.sdk.path}/include/micro-ecc" "-I{compiler.sdk.path}/include/mqtt" "-I{compiler.sdk.path}/include/newlib" "-I{compiler.sdk.path}/include/nghttp" "-I{compiler.sdk.path}/include/nvs_flash" "-I{compiler.sdk.path}/include/openssl" "-I{compiler.sdk.path}/include/protobuf-c" "-I{compiler.sdk.path}/include/protocomm" "-I{compiler.sdk.path}/include/pthread" "-I{compiler.sdk.path}/include/sdmmc" "-I{compiler.sdk.path}/include/smartconfig_ack" "-I{compiler.sdk.path}/include/soc" "-I{compiler.sdk.path}/include/spi_flash" "-I{compiler.sdk.path}/include/spiffs" "-I{compiler.sdk.path}/include/tcp_transport" "-I{compiler.sdk.path}/include/tcpip_adapter" "-I{compiler.sdk.path}/include/ulp" "-I{compiler.sdk.path}/include/vfs" "-I{compiler.sdk.path}/include/wear_levelling" "-I{compiler.sdk.path}/include/wifi_provisioning" "-I{compiler.sdk.path}/include/wpa_supplicant" "-I{compiler.sdk.path}/include/xtensa-debug-module" "-I{compiler.sdk.path}/include/esp-face" "-I{compiler.sdk.path}/include/esp32-camera" "-I{compiler.sdk.path}/include/esp-face" "-I{compiler.sdk.path}/include/fb_gfx"
+compiler.cpreprocessor.flags=-DESP_PLATFORM -DMBEDTLS_CONFIG_FILE="mbedtls/esp_config.h" -DHAVE_CONFIG_H -DGCC_NOT_5_2_0=0 -DWITH_POSIX "-I{compiler.sdk.path}/include/config" "-I{compiler.sdk.path}/include/app_trace" "-I{compiler.sdk.path}/include/app_update" "-I{compiler.sdk.path}/include/asio" "-I{compiler.sdk.path}/include/bootloader_support" "-I{compiler.sdk.path}/include/bt" "-I{compiler.sdk.path}/include/coap" "-I{compiler.sdk.path}/include/console" "-I{compiler.sdk.path}/include/driver" "-I{compiler.sdk.path}/include/esp-tls" "-I{compiler.sdk.path}/include/esp32" "-I{compiler.sdk.path}/include/esp_adc_cal" "-I{compiler.sdk.path}/include/esp_event" "-I{compiler.sdk.path}/include/esp_http_client" "-I{compiler.sdk.path}/include/esp_http_server" "-I{compiler.sdk.path}/include/esp_https_ota" "-I{compiler.sdk.path}/include/esp_ringbuf" "-I{compiler.sdk.path}/include/ethernet" "-I{compiler.sdk.path}/include/expat" "-I{compiler.sdk.path}/include/fatfs" "-I{compiler.sdk.path}/include/freemodbus" "-I{compiler.sdk.path}/include/freertos" "-I{compiler.sdk.path}/include/heap" "-I{compiler.sdk.path}/include/idf_test" "-I{compiler.sdk.path}/include/jsmn" "-I{compiler.sdk.path}/include/json" "-I{compiler.sdk.path}/include/libsodium" "-I{compiler.sdk.path}/include/log" "-I{compiler.sdk.path}/include/lwip" "-I{compiler.sdk.path}/include/mbedtls" "-I{compiler.sdk.path}/include/mdns" "-I{compiler.sdk.path}/include/micro-ecc" "-I{compiler.sdk.path}/include/mqtt" "-I{compiler.sdk.path}/include/newlib" "-I{compiler.sdk.path}/include/nghttp" "-I{compiler.sdk.path}/include/nvs_flash" "-I{compiler.sdk.path}/include/openssl" "-I{compiler.sdk.path}/include/protobuf-c" "-I{compiler.sdk.path}/include/protocomm" "-I{compiler.sdk.path}/include/pthread" "-I{compiler.sdk.path}/include/sdmmc" "-I{compiler.sdk.path}/include/smartconfig_ack" "-I{compiler.sdk.path}/include/soc" "-I{compiler.sdk.path}/include/spi_flash" "-I{compiler.sdk.path}/include/spiffs" "-I{compiler.sdk.path}/include/tcp_transport" "-I{compiler.sdk.path}/include/tcpip_adapter" "-I{compiler.sdk.path}/include/ulp" "-I{compiler.sdk.path}/include/vfs" "-I{compiler.sdk.path}/include/wear_levelling" "-I{compiler.sdk.path}/include/wifi_provisioning" "-I{compiler.sdk.path}/include/wpa_supplicant" "-I{compiler.sdk.path}/include/xtensa-debug-module" "-I{compiler.sdk.path}/include/esp-face" "-I{compiler.sdk.path}/include/esp32-camera" "-I{compiler.sdk.path}/include/esp-face" "-I{compiler.sdk.path}/include/fb_gfx"
 
 compiler.c.cmd=xtensa-esp32-elf-gcc
 compiler.c.flags=-std=gnu99 -Os -g3 -fstack-protector -ffunction-sections -fdata-sections -fstrict-volatile-bitfields -mlongcalls -nostdlib -Wpointer-arith {compiler.warning_flags} -Wno-maybe-uninitialized -Wno-unused-function -Wno-unused-but-set-variable -Wno-unused-variable -Wno-deprecated-declarations -Wno-unused-parameter -Wno-sign-compare -Wno-old-style-declaration -MMD -c
@@ -35,7 +35,7 @@ compiler.S.flags=-c -g3 -x assembler-with-cpp -MMD -mlongcalls
 
 compiler.c.elf.cmd=xtensa-esp32-elf-gcc
 compiler.c.elf.flags=-nostdlib "-L{compiler.sdk.path}/lib" "-L{compiler.sdk.path}/ld" -T esp32_out.ld -T esp32.common.ld -T esp32.rom.ld -T esp32.peripherals.ld -T esp32.rom.libgcc.ld -T esp32.rom.spiram_incompatible_fns.ld -u ld_include_panic_highint_hdl -u call_user_start_cpu0 -Wl,--gc-sections -Wl,-static -Wl,--undefined=uxTopUsedPriority  -u __cxa_guard_dummy -u __cxx_fatal_exception
-compiler.c.elf.libs=-lgcc -lopenssl -lbtdm_app -lfatfs -lwps -lcoexist -lwear_levelling -lesp_http_client -lprotobuf-c -lhal -lnewlib -ldriver -lbootloader_support -lpp -lfreemodbus -lmesh -lsmartconfig -ljsmn -lwpa -lethernet -lphy -lapp_trace -lconsole -lulp -lwpa_supplicant -lfreertos -lbt -lmicro-ecc -lesp32-camera -lcxx -lxtensa-debug-module -ltcp_transport -lmdns -lvfs -lesp_ringbuf -lsoc -lcore -lfb_gfx -lsdmmc -llibsodium -lcoap -ltcpip_adapter -lprotocomm -lesp_event -limage_util -lc_nano -lesp-tls -lasio -lrtc -lspi_flash -lwpa2 -lwifi_provisioning -lesp32 -lface_recognition -lapp_update -lnghttp -lspiffs -lface_detection -lespnow -lnvs_flash -lesp_adc_cal -llog -ldl_lib -lsmartconfig_ack -lexpat -lm -lfr -lmqtt -lc -lheap -lmbedtls -llwip -lnet80211 -lesp_http_server -lpthread -ljson -lesp_https_ota -lfd  -lstdc++
+compiler.c.elf.libs=-lgcc -lesp32 -lphy -lesp_http_client -lmbedtls -lrtc -lesp_http_server -lbtdm_app -lspiffs -lbootloader_support -lmdns -lnvs_flash -lfatfs -lpp -lnet80211 -ljsmn -lface_detection -llibsodium -lvfs -ldl_lib -llog -lfreertos -lcxx -lsmartconfig_ack -lxtensa-debug-module -lheap -ltcpip_adapter -lmqtt -lulp -lfd -lfb_gfx -lnghttp -lprotocomm -lsmartconfig -lm -lethernet -limage_util -lc_nano -lsoc -ltcp_transport -lc -lmicro-ecc -lface_recognition -ljson -lwpa_supplicant -lmesh -lesp_https_ota -lwpa2 -lexpat -llwip -lwear_levelling -lapp_update -ldriver -lbt -lespnow -lcoap -lasio -lnewlib -lconsole -lapp_trace -lesp32-camera -lhal -lprotobuf-c -lsdmmc -lcore -lpthread -lcoexist -lfreemodbus -lspi_flash -lesp-tls -lwpa -lwifi_provisioning -lwps -lesp_adc_cal -lesp_event -lopenssl -lesp_ringbuf -lfr  -lstdc++
 
 compiler.as.cmd=xtensa-esp32-elf-as
 
diff --git a/tools/esptool.py b/tools/esptool.py
index 6bfa1f7b667..d6ceb6f9b39 100755
--- a/tools/esptool.py
+++ b/tools/esptool.py
@@ -60,7 +60,7 @@
           "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 @@ def byte(bitstr, index):
     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 @@ def connect(self, mode='default_reset'):
             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 @@ def read_reg(self, addr):
             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 @@ def flash_block(self, data, seq, timeout=DEFAULT_TIMEOUT):
                            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 @@ def read_flash(self, offset, length, progress_fn=None):
             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 @@ def write_status(self, new_status, num_bytes=2, set_non_volatile=False):
 
         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 @@ def get_chip_description(self):
             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 @@ def __init__(self):
         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 @@ def warn_if_unusual_segment(self, offset, size, is_irom_segment):
     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 @@ def is_irom_addr(self, addr):
         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 @@ def save(self, basename):
             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 @@ def __init__(self, load_file=None):
         self.cs_drv = 0
         self.hd_drv = 0
         self.wp_drv = 0
+        self.min_rev = 0
 
         self.append_digest = True
 
@@ -1745,15 +1902,21 @@ def split_byte(n):
         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 @@ def join_byte(ln,hn):
         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 add_spi_flash_subparsers(parent, is_elf2image):
         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 add_spi_flash_subparsers(parent, is_elf2image):
                             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 add_spi_flash_subparsers(parent, is_elf2image):
     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 add_spi_flash_subparsers(parent, is_elf2image):
     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 add_spi_flash_subparsers(parent, is_elf2image):
                 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 add_spi_flash_subparsers(parent, is_elf2image):
         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 @@ def __call__(self, parser, namespace, values, option_string=None):
         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 @@ def __call__(self, parser, namespace, values, option_string=None):
 
 # Binary stub code (see flasher_stub dir for source & details)
 ESP8266ROM.STUB_CODE = eval(zlib.decompress(base64.b64decode(b"""
-eNrNPXt/00a2X8WSQ0iCoRpJ1iMNxXaCeRS2ATYBdtNtpJEE5ZZuYvzbUJZ+96vzmhnJDoG+7v0j1CNpZs6c9zlzZvrf68v6/fL67qC8fvK+yE7eq+DkfRBM2n/Uyfumgb/5HB51/7L2r6nvfHd/+qDtF7d/JXx6\
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 """)))
 ESP32ROM.STUB_CODE = eval(zlib.decompress(base64.b64decode(b"""
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 """)))
 
 
diff --git a/tools/platformio-build.py b/tools/platformio-build.py
index e3b68683433..93c021a2bfb 100644
--- a/tools/platformio-build.py
+++ b/tools/platformio-build.py
@@ -165,7 +165,7 @@
     ],
 
     LIBS=[
-        "-lgcc", "-lopenssl", "-lbtdm_app", "-lfatfs", "-lwps", "-lcoexist", "-lwear_levelling", "-lesp_http_client", "-lprotobuf-c", "-lhal", "-lnewlib", "-ldriver", "-lbootloader_support", "-lpp", "-lfreemodbus", "-lmesh", "-lsmartconfig", "-ljsmn", "-lwpa", "-lethernet", "-lphy", "-lapp_trace", "-lconsole", "-lulp", "-lwpa_supplicant", "-lfreertos", "-lbt", "-lmicro-ecc", "-lesp32-camera", "-lcxx", "-lxtensa-debug-module", "-ltcp_transport", "-lmdns", "-lvfs", "-lesp_ringbuf", "-lsoc", "-lcore", "-lfb_gfx", "-lsdmmc", "-llibsodium", "-lcoap", "-ltcpip_adapter", "-lprotocomm", "-lesp_event", "-limage_util", "-lc_nano", "-lesp-tls", "-lasio", "-lrtc", "-lspi_flash", "-lwpa2", "-lwifi_provisioning", "-lesp32", "-lface_recognition", "-lapp_update", "-lnghttp", "-lspiffs", "-lface_detection", "-lespnow", "-lnvs_flash", "-lesp_adc_cal", "-llog", "-ldl_lib", "-lsmartconfig_ack", "-lexpat", "-lm", "-lfr", "-lmqtt", "-lc", "-lheap", "-lmbedtls", "-llwip", "-lnet80211", "-lesp_http_server", "-lpthread", "-ljson", "-lesp_https_ota", "-lfd", "-lstdc++"
+        "-lgcc", "-lesp32", "-lphy", "-lesp_http_client", "-lmbedtls", "-lrtc", "-lesp_http_server", "-lbtdm_app", "-lspiffs", "-lbootloader_support", "-lmdns", "-lnvs_flash", "-lfatfs", "-lpp", "-lnet80211", "-ljsmn", "-lface_detection", "-llibsodium", "-lvfs", "-ldl_lib", "-llog", "-lfreertos", "-lcxx", "-lsmartconfig_ack", "-lxtensa-debug-module", "-lheap", "-ltcpip_adapter", "-lmqtt", "-lulp", "-lfd", "-lfb_gfx", "-lnghttp", "-lprotocomm", "-lsmartconfig", "-lm", "-lethernet", "-limage_util", "-lc_nano", "-lsoc", "-ltcp_transport", "-lc", "-lmicro-ecc", "-lface_recognition", "-ljson", "-lwpa_supplicant", "-lmesh", "-lesp_https_ota", "-lwpa2", "-lexpat", "-llwip", "-lwear_levelling", "-lapp_update", "-ldriver", "-lbt", "-lespnow", "-lcoap", "-lasio", "-lnewlib", "-lconsole", "-lapp_trace", "-lesp32-camera", "-lhal", "-lprotobuf-c", "-lsdmmc", "-lcore", "-lpthread", "-lcoexist", "-lfreemodbus", "-lspi_flash", "-lesp-tls", "-lwpa", "-lwifi_provisioning", "-lwps", "-lesp_adc_cal", "-lesp_event", "-lopenssl", "-lesp_ringbuf", "-lfr", "-lstdc++"
     ],
 
     LIBSOURCE_DIRS=[
diff --git a/tools/sdk/bin/bootloader_dio_40m.bin b/tools/sdk/bin/bootloader_dio_40m.bin
index 70d4510a14d..ac057886d98 100644
Binary files a/tools/sdk/bin/bootloader_dio_40m.bin and b/tools/sdk/bin/bootloader_dio_40m.bin differ
diff --git a/tools/sdk/bin/bootloader_dio_80m.bin b/tools/sdk/bin/bootloader_dio_80m.bin
index 4b77aab0622..726e1ca9145 100644
Binary files a/tools/sdk/bin/bootloader_dio_80m.bin and b/tools/sdk/bin/bootloader_dio_80m.bin differ
diff --git a/tools/sdk/bin/bootloader_dout_40m.bin b/tools/sdk/bin/bootloader_dout_40m.bin
index 464a0b1ab5a..eab1e96d1f5 100644
Binary files a/tools/sdk/bin/bootloader_dout_40m.bin and b/tools/sdk/bin/bootloader_dout_40m.bin differ
diff --git a/tools/sdk/bin/bootloader_dout_80m.bin b/tools/sdk/bin/bootloader_dout_80m.bin
index b66faeee2b3..4d1f69f44c1 100644
Binary files a/tools/sdk/bin/bootloader_dout_80m.bin and b/tools/sdk/bin/bootloader_dout_80m.bin differ
diff --git a/tools/sdk/bin/bootloader_qio_40m.bin b/tools/sdk/bin/bootloader_qio_40m.bin
index 70d4510a14d..0c2e9fe279a 100644
Binary files a/tools/sdk/bin/bootloader_qio_40m.bin and b/tools/sdk/bin/bootloader_qio_40m.bin differ
diff --git a/tools/sdk/bin/bootloader_qio_80m.bin b/tools/sdk/bin/bootloader_qio_80m.bin
index 627d104cc2c..944f4947edf 100644
Binary files a/tools/sdk/bin/bootloader_qio_80m.bin and b/tools/sdk/bin/bootloader_qio_80m.bin differ
diff --git a/tools/sdk/bin/bootloader_qout_40m.bin b/tools/sdk/bin/bootloader_qout_40m.bin
index 898b8e0c9d4..07a6be715c0 100644
Binary files a/tools/sdk/bin/bootloader_qout_40m.bin and b/tools/sdk/bin/bootloader_qout_40m.bin differ
diff --git a/tools/sdk/bin/bootloader_qout_80m.bin b/tools/sdk/bin/bootloader_qout_80m.bin
index a514b2ed660..8cfb0c2529e 100644
Binary files a/tools/sdk/bin/bootloader_qout_80m.bin and b/tools/sdk/bin/bootloader_qout_80m.bin differ
diff --git a/tools/sdk/include/bootloader_support/bootloader_common.h b/tools/sdk/include/bootloader_support/bootloader_common.h
index 194d2769cbd..e884856f6d2 100644
--- a/tools/sdk/include/bootloader_support/bootloader_common.h
+++ b/tools/sdk/include/bootloader_support/bootloader_common.h
@@ -14,6 +14,7 @@
 
 #pragma once
 #include "esp_flash_data_types.h"
+#include "esp_image_format.h"
 
 /// Type of hold a GPIO in low state
 typedef enum {
@@ -92,6 +93,17 @@ bool bootloader_common_label_search(const char *list, char *label);
  */
 esp_err_t bootloader_common_get_sha256_of_partition(uint32_t address, uint32_t size, int type, uint8_t *out_sha_256);
 
+/**
+ * @brief Check if the image (bootloader and application) has valid chip ID and revision
+ *
+ * @param img_hdr: image header
+ * @return
+ *      - ESP_OK: image and chip are matched well
+ *      - ESP_FAIL: image doesn't match to the chip
+ */
+esp_err_t bootloader_common_check_chip_validity(const esp_image_header_t* img_hdr);
+
+
 /**
  * @brief Configure VDDSDIO, call this API to rise VDDSDIO to 1.9V when VDDSDIO regulator is enabled as 1.8V mode.
  */
diff --git a/tools/sdk/include/bootloader_support/esp_efuse.h b/tools/sdk/include/bootloader_support/esp_efuse.h
index c094a6ab445..047a971a4c1 100644
--- a/tools/sdk/include/bootloader_support/esp_efuse.h
+++ b/tools/sdk/include/bootloader_support/esp_efuse.h
@@ -91,6 +91,13 @@ esp_err_t esp_efuse_apply_34_encoding(const uint8_t *in_bytes, uint32_t *out_wor
  */
 void esp_efuse_write_random_key(uint32_t blk_wdata0_reg);
 
+/**
+ * @brief   Returns chip version from efuse
+ *
+ * @return chip version
+ */
+uint8_t esp_efuse_get_chip_ver(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/tools/sdk/include/bootloader_support/esp_image_format.h b/tools/sdk/include/bootloader_support/esp_image_format.h
index bce3b1d7fad..0e2bb5283dd 100644
--- a/tools/sdk/include/bootloader_support/esp_image_format.h
+++ b/tools/sdk/include/bootloader_support/esp_image_format.h
@@ -55,6 +55,19 @@ typedef enum {
 
 #define ESP_IMAGE_HEADER_MAGIC 0xE9
 
+/**
+ * @brief ESP chip ID
+ *
+ */
+typedef enum {
+    ESP_CHIP_ID_ESP32 = 0x0000,  /*!< chip ID: ESP32 */
+    ESP_CHIP_ID_INVALID = 0xFFFF /*!< Invalid chip ID (we defined it to make sure the esp_chip_id_t is 2 bytes size) */
+} __attribute__((packed)) esp_chip_id_t;
+
+/** @cond */
+_Static_assert(sizeof(esp_chip_id_t) == 2, "esp_chip_id_t should be 16 bit");
+
+
 /* Main header of binary image */
 typedef struct {
     uint8_t magic;
@@ -71,8 +84,12 @@ typedef struct {
     uint8_t wp_pin;
     /* Drive settings for the SPI flash pins (read by ROM bootloader) */
     uint8_t spi_pin_drv[3];
-    /* Reserved bytes in ESP32 additional header space, currently unused */
-    uint8_t reserved[11];
+    /*!< Chip identification number */
+    esp_chip_id_t chip_id;
+    /*!< Minimum chip revision supported by image */
+    uint8_t min_chip_rev;
+    /*!< Reserved bytes in additional header space, currently unused */
+    uint8_t reserved[8];
     /* If 1, a SHA256 digest "simple hash" (of the entire image) is appended after the checksum. Included in image length. This digest
      * is separate to secure boot and only used for detecting corruption. For secure boot signed images, the signature
      * is appended after this (and the simple hash is included in the signed data). */
diff --git a/tools/sdk/include/config/sdkconfig.h b/tools/sdk/include/config/sdkconfig.h
index 6d6152bce40..444fb1a682a 100644
--- a/tools/sdk/include/config/sdkconfig.h
+++ b/tools/sdk/include/config/sdkconfig.h
@@ -75,6 +75,7 @@
 #define CONFIG_MBEDTLS_ECP_DP_BP384R1_ENABLED 1
 #define CONFIG_MBEDTLS_ECP_DP_SECP256K1_ENABLED 1
 #define CONFIG_CAMERA_CORE1 1
+#define CONFIG_ESP32_DPORT_DIS_INTERRUPT_LVL 5
 #define CONFIG_MB_SERIAL_BUF_SIZE 256
 #define CONFIG_CONSOLE_UART_BAUDRATE 115200
 #define CONFIG_SPIRAM_SUPPORT 1
@@ -153,8 +154,10 @@
 #define CONFIG_ADC2_DISABLE_DAC 1
 #define CONFIG_HFP_ENABLE 1
 #define CONFIG_BLE_ADV_REPORT_FLOW_CONTROL_NUM 100
+#define CONFIG_ESP32_REV_MIN_0 1
 #define CONFIG_LOG_DEFAULT_LEVEL 1
 #define CONFIG_TIMER_QUEUE_LENGTH 10
+#define CONFIG_ESP32_REV_MIN 0
 #define CONFIG_SUPPRESS_SELECT_DEBUG_OUTPUT 1
 #define CONFIG_GATTS_SEND_SERVICE_CHANGE_MODE 0
 #define CONFIG_MAKE_WARN_UNDEFINED_VARIABLES 1
@@ -295,6 +298,7 @@
 #define CONFIG_REDUCE_PHY_TX_POWER 1
 #define CONFIG_BOOTLOADER_WDT_TIME_MS 9000
 #define CONFIG_FREERTOS_CORETIMER_0 1
+#define CONFIG_IDF_FIRMWARE_CHIP_ID 0x0000
 #define CONFIG_PARTITION_TABLE_CUSTOM_FILENAME "partitions.csv"
 #define CONFIG_MBEDTLS_HAVE_TIME 1
 #define CONFIG_FREERTOS_CHECK_STACKOVERFLOW_CANARY 1
@@ -336,6 +340,7 @@
 #define CONFIG_MQTT_TRANSPORT_WEBSOCKET_SECURE 1
 #define CONFIG_SPIFFS_PAGE_SIZE 256
 #define CONFIG_MBEDTLS_ECP_DP_SECP192K1_ENABLED 1
+#define CONFIG_ESP32_DPORT_WORKAROUND 1
 #define CONFIG_PPP_MSCHAP_SUPPORT 1
 #define CONFIG_TASK_WDT_CHECK_IDLE_TASK_CPU0 1
 #define CONFIG_ESP32_PTHREAD_TASK_STACK_SIZE_DEFAULT 2048
@@ -355,3 +360,5 @@
 #define CONFIG_ARDUHAL_LOG_DEFAULT_LEVEL_ERROR 1
 #define CONFIG_ESP32_WIFI_IRAM_OPT 1
 #define CONFIG_FATFS_API_ENCODING_ANSI_OEM 1
+#define CONFIG_ARDUINO_IDF_COMMIT "d3e562907"
+#define CONFIG_ARDUINO_IDF_BRANCH "release/v3.2"
diff --git a/tools/sdk/include/esp-face/dl_lib_matrix3d.h b/tools/sdk/include/esp-face/dl_lib_matrix3d.h
index 82e671f8ded..4de26b4209a 100644
--- a/tools/sdk/include/esp-face/dl_lib_matrix3d.h
+++ b/tools/sdk/include/esp-face/dl_lib_matrix3d.h
@@ -27,24 +27,22 @@ typedef enum
  */
 typedef struct
 {
-    /******* fix start *******/
-    int w; // Width
-    int h; // Height
-    int c; // Channel
-    int n; // Number, to record filter's out_channels. input and output must be 1
-    int stride;
-    fptp_t *item;
-    /******* fix end *******/
+    int w;          /*!< Width */
+    int h;          /*!< Height */
+    int c;          /*!< Channel */
+    int n;          /*!< Number of filter, input and output must be 1 */
+    int stride;     /*!< Step between lines */
+    fptp_t *item;   /*!< Data */
 } dl_matrix3d_t;
 
 typedef struct
 {
-    int w; // Width
-    int h; // Height
-    int c; // Channel
-    int n; // Number, to record filter's out_channels. input and output must be 1
-    int stride;
-    uc_t *item;
+    int w;          /*!< Width */
+    int h;          /*!< Height */
+    int c;          /*!< Channel */
+    int n;          /*!< Number of filter, input and output must be 1 */
+    int stride;     /*!< Step between lines */
+    uc_t *item;     /*!< Data */
 } dl_matrix3du_t;
 
 typedef struct
diff --git a/tools/sdk/include/esp-face/dl_lib_matrix3dq.h b/tools/sdk/include/esp-face/dl_lib_matrix3dq.h
index 31da2c05747..57e5e92c22e 100644
--- a/tools/sdk/include/esp-face/dl_lib_matrix3dq.h
+++ b/tools/sdk/include/esp-face/dl_lib_matrix3dq.h
@@ -3,20 +3,21 @@
 
 typedef int16_t qtp_t;
 
-/*
- * Matrix for 3d
- * @Warning: the sequence of variables is fixed, cannot be modified, otherwise there will be errors in esp_dsp_dot_float
+/**
+ * Matrix for input, filter, and output
+ * @Warning: the sequence of variables is fixed, cannot be modified, otherwise there will be errors in 
+ * some handwrite xtensa instruction functions
  */
 typedef struct
 {
     /******* fix start *******/
-    int w; // Width
-    int h; // Height
-    int c; // Channel
-    int n; // Number, to record filter's out_channels. input and output must be 1
-    int stride;
-    int exponent;
-    qtp_t *item;
+    int w;          /*!< Width */
+    int h;          /*!< Height */
+    int c;          /*!< Channel */
+    int n;          /*!< Number of filter, input and output must be 1 */
+    int stride;     /*!< Step between lines */
+    int exponent;   /*!< Exponent for quantization */
+    qtp_t *item;    /*!< Data */
     /******* fix end *******/
 } dl_matrix3dq_t;
 
@@ -32,21 +33,28 @@ typedef struct
 #define DL_SHIFT_AUTO 32
 #endif
 
+/**
+ * Implementation of matrix relative operations
+ */
 typedef enum
 {
-    DL_C_IMPL = 0,
-    DL_XTENSA_IMPL = 1
+    DL_C_IMPL = 0,      /*!< ANSI C */
+    DL_XTENSA_IMPL = 1  /*!< Handwrite xtensa instruction */
 } dl_conv_mode;
 
+
+/**
+ * Configuration of mobilenet operation
+ */
 typedef struct
 {
-    int stride_x;
-    int stride_y;
-    dl_padding_type padding;
-    dl_conv_mode mode;
-    int dilate_exponent;
-    int depthwise_exponent;
-    int compress_exponent;
+    int stride_x;               /*!< Strides of width */
+    int stride_y;               /*!< Strides of height */
+    dl_padding_type padding;    /*!< Padding type */
+    dl_conv_mode mode;          /*!< Implementation mode */
+    int dilate_exponent;        /*!< Exponent of dilation filter */
+    int depthwise_exponent;     /*!< Exponent of depthwise filter */
+    int compress_exponent;      /*!< Exponent of compress filter */
 } dl_matrix3dq_mobilenet_config_t;
 
 //
@@ -54,75 +62,166 @@ typedef struct
 //
 
 /*
- * @brief Allocate a 3D matrix
+ * @brief Allocate a 3d quantised matrix
  *
- * @param n,w,h,c   number, width, height, channel
- * @return 3d matrix
+ * @param n Number of filters, for input and output, should be 1
+ * @param w Width of matrix
+ * @param h Height of matrix
+ * @param c Channel of matrix
+ * @param e Exponent of matrix data
+ * @return 3d quantized matrix
  */
 dl_matrix3dq_t *dl_matrix3dq_alloc(int n, int w, int h, int c, int e);
 
 /*
- * @brief Free a 3D matrix
+ * @brief Free a 3d quantized matrix
  *
- * @param m matrix
+ * @param m 3d quantised matrix
  */
 void dl_matrix3dq_free(dl_matrix3dq_t *m);
 
-/**
- * @brief Zero out the matrix
- * Sets all entries in the matrix to 0.
- *
- * @param m     Matrix to zero
- */
-
 /**
  * @brief Copy a range of items from an existing matrix to a preallocated matrix
  *
- * @param in    Old matrix (with foreign data) to re-use. Passing NULL will allocate a new matrix.
+ * @param dst   The resulting slice matrix
+ * @param src   Old matrix to slice.
  * @param x     X-offset of the origin of the returned matrix within the sliced matrix
  * @param y     Y-offset of the origin of the returned matrix within the sliced matrix
  * @param w     Width of the resulting matrix
  * @param h     Height of the resulting matrix
- * @return The resulting slice matrix
  */
 void dl_matrix3dq_slice_copy(dl_matrix3dq_t *dst, dl_matrix3dq_t *src, int x, int y, int w, int h);
 
+/**
+ * @brief Transform a fixed point matrix to a float point matrix
+ *
+ * @param m     Quantized matrix
+ * @return      Float point matrix
+ */
 dl_matrix3d_t *dl_matrix3d_from_matrixq(dl_matrix3dq_t *m);
 
+/**
+ * @brief Transform a float point matrix to a fixed point matrix with pre-defined exponent
+ *
+ * @param m         Float point matrix
+ * @param exponent  Exponent for resulting matrix
+ * @return          Fixed point matrix
+ */
 dl_matrix3dq_t *dl_matrixq_from_matrix3d_qmf(dl_matrix3d_t *m, int exponent);
 
+/**
+ * @brief Transform a float point matrix to a fixed point matrix. The exponent is defined by the distribution of the input matrix.
+ *
+ * @param m         Float point matrix
+ * @return          Fixed point matrix
+ */
 dl_matrix3dq_t *dl_matrixq_from_matrix3d(dl_matrix3d_t *m);
 
 qtp_t dl_matrix3dq_quant_range_exceeded_checking(int64_t value, char *location);
 
+/**
+ * @brief Reform a quantized matrix with exponent
+ *
+ * @param out       Preallocated resulting matrix
+ * @param in        Input matrix
+ * @param exponent  Exponent for resulting matrix
+ */
 void dl_matrix3dq_shift_exponent(dl_matrix3dq_t *out, dl_matrix3dq_t *in, int exponent);
 
+/**
+ * @brief Do batch normalization for a quantized matrix
+ *
+ * @param m         Input and output quantized matrix, data will be updated
+ * @param scale     Scale of batch-norm
+ * @param offset    Offset of batch-norm
+ */
 void dl_matrix3dq_batch_normalize(dl_matrix3dq_t *m, dl_matrix3dq_t *scale, dl_matrix3dq_t *offset);
 
+/**
+ * @brief Add two quantized matrix with a pre-defined exponent
+ *
+ * @param in_1      Adder 1
+ * @param in_2      Adder 2
+ * @param exponent  Exponent for resulting matrix
+ * @return          Result of accumulation of two matrix
+ */
 dl_matrix3dq_t *dl_matrix3dq_add(dl_matrix3dq_t *in_1, dl_matrix3dq_t *in_2, int exponent);
 
 //
 // Activation
 //
+/**
+ * @brief Do relu for a quantized matrix
+ *
+ * @param in        Input and output quantized matrix, data will be updated
+ */
 void dl_matrix3dq_relu(dl_matrix3dq_t *in);
 
+/**
+ * @brief Do relu with clips for a quantized matrix
+ *
+ * @param in        Input and output quantized matrix, data will be updated
+ * @param clip      Float point value to limit the maximum data
+ */
 void dl_matrix3dq_relu_clip(dl_matrix3dq_t *in, fptp_t clip);
 
+/**
+ * @brief Do leaky relu for a quantized matrix
+ *
+ * @param in        Input and output quantized matrix, data will be updated
+ * @param alpha     Float point value to multiply for those less than zero
+ * @param clip      Float point value to limit the maximum data
+ */
 void dl_matrix3dq_leaky_relu(dl_matrix3dq_t *in, fptp_t alpha, fptp_t clip);
 
+/**
+ * @brief Do prelu for a quantized matrix
+ *
+ * @param in        Input and output quantized matrix, data will be updated
+ * @param alpha     Quantized matrix to multiply for those less than zero
+ */
 void dl_matrix3dq_p_relu(dl_matrix3dq_t *in, dl_matrix3dq_t *alpha);
 
 //
 // Concat
 //
+/**
+ * @brief Concatenate two quantized matrix in channel
+ *
+ * @param in_1      Quantized matrix to be concatenated
+ * @param in_2      Quantized matrix to be concatenated
+ * @return          Quantized matrix with the same width and height of in_1 and in_2, and with the sum of channel number of in_1 and in_2
+ */
 dl_matrix3dq_t *dl_matrix3dq_concat(dl_matrix3dq_t *in_1,
                                     dl_matrix3dq_t *in_2);
 
+/**
+ * @brief Concatenate four quantized matrix in channel
+ *
+ * @param in_1      Quantized matrix to be concatenated
+ * @param in_2      Quantized matrix to be concatenated
+ * @param in_3      Quantized matrix to be concatenated
+ * @param in_4      Quantized matrix to be concatenated
+ * @return          Quantized matrix with the same width and height of all inputs, and with the sum of channel number of all inputs
+ */
 dl_matrix3dq_t *dl_matrix3dq_concat_4(dl_matrix3dq_t *in_1,
                                       dl_matrix3dq_t *in_2,
                                       dl_matrix3dq_t *in_3,
                                       dl_matrix3dq_t *in_4);
 
+/**
+ * @brief Concatenate four quantized matrix in channel
+ *
+ * @param in_1      Quantized matrix to be concatenated
+ * @param in_2      Quantized matrix to be concatenated
+ * @param in_3      Quantized matrix to be concatenated
+ * @param in_4      Quantized matrix to be concatenated
+ * @param in_5      Quantized matrix to be concatenated
+ * @param in_6      Quantized matrix to be concatenated
+ * @param in_7      Quantized matrix to be concatenated
+ * @param in_8      Quantized matrix to be concatenated
+ * @return          Quantized matrix with the same width and height of all inputs, and with the sum of channel number of all inputs
+ */
 dl_matrix3dq_t *dl_matrix3dq_concat_8(dl_matrix3dq_t *in_1,
                                       dl_matrix3dq_t *in_2,
                                       dl_matrix3dq_t *in_3,
@@ -135,16 +234,42 @@ dl_matrix3dq_t *dl_matrix3dq_concat_8(dl_matrix3dq_t *in_1,
 //
 // Conv 1x1
 //
+/**
+ * @brief Do 1x1 convolution with a quantized matrix
+ *
+ * @param out       Preallocated quantized matrix, size (1, w, h, n)
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    1x1 filter, size (n, 1, 1, c)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3dqq_conv_1x1(dl_matrix3dq_t *out,
                             dl_matrix3dq_t *in,
                             dl_matrix3dq_t *filter,
                             dl_conv_mode mode);
 
+/**
+ * @brief Do 1x1 convolution with a quantized matrix, with relu activation
+ *
+ * @param out       Preallocated quantized matrix, size (1, w, h, n)
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    1x1 filter, size (n, 1, 1, c)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3dqq_conv_1x1_with_relu(dl_matrix3dq_t *out,
                                       dl_matrix3dq_t *in,
                                       dl_matrix3dq_t *filter,
                                       dl_conv_mode mode);
 
+/**
+ * @brief Do 1x1 convolution with a quantized matrix, with bias adding
+ *
+ * @param out       Preallocated quantized matrix, size (1, w, h, n)
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    1x1 filter, size (n, 1, 1, c)
+ * @param bias      Bias, size (1, 1, 1, n)
+ * @param mode      Implementation mode
+ * @param name      Layer name to debug
+ */
 void dl_matrix3dqq_conv_1x1_with_bias(dl_matrix3dq_t *out,
                                       dl_matrix3dq_t *in,
                                       dl_matrix3dq_t *filter,
@@ -152,23 +277,49 @@ void dl_matrix3dqq_conv_1x1_with_bias(dl_matrix3dq_t *out,
                                       dl_conv_mode mode,
                                       char *name);
 
-void dl_matrix3dqq_conv_1x1_with_prelu(dl_matrix3dq_t *out,
-                                       dl_matrix3dq_t *in,
-                                       dl_matrix3dq_t *filter,
-                                       dl_matrix3dq_t *prelu,
-                                       dl_conv_mode mode);
-
+/**
+ * @brief Do 1x1 convolution with a quantized matrix, with bias adding and relu activation
+ *
+ * @param out       Preallocated quantized matrix, size (1, w, h, n)
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    1x1 filter, size (n, 1, 1, c)
+ * @param bias      Bias, size (1, 1, 1, n)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3dqq_conv_1x1_with_bias_relu(dl_matrix3dq_t *out,
                                            dl_matrix3dq_t *in,
                                            dl_matrix3dq_t *filter,
                                            dl_matrix3dq_t *bias,
                                            dl_conv_mode mode);
 
+void dl_matrix3dqq_conv_1x1_with_prelu(dl_matrix3dq_t *out,
+                                       dl_matrix3dq_t *in,
+                                       dl_matrix3dq_t *filter,
+                                       dl_matrix3dq_t *prelu,
+                                       dl_conv_mode mode);
+
+/**
+ * @brief Do 1x1 convolution with an 8-bit fixed point matrix
+ *
+ * @param out       Preallocated quantized matrix, size (1, w, h, n)
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    1x1 filter, size (n, 1, 1, c)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3duq_conv_1x1(dl_matrix3dq_t *out,
                             dl_matrix3du_t *in,
                             dl_matrix3dq_t *filter,
                             dl_conv_mode mode);
 
+/**
+ * @brief Do 1x1 convolution with an 8-bit fixed point matrix, with bias adding
+ *
+ * @param out       Preallocated quantized matrix, size (1, w, h, n)
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    1x1 filter, size (n, 1, 1, c)
+ * @param bias      Bias, size (1, 1, 1, n)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3duq_conv_1x1_with_bias(dl_matrix3dq_t *out,
                                       dl_matrix3du_t *in,
                                       dl_matrix3dq_t *filter,
@@ -178,12 +329,32 @@ void dl_matrix3duq_conv_1x1_with_bias(dl_matrix3dq_t *out,
 //
 // Conv 3x3
 //
+/**
+ * @brief Do 3x3 convolution basic operation with a quantized matrix
+ *
+ * @param out       Preallocated quantized matrix
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (n, 3, 3, c)
+ * @param stride_x  Stride of width
+ * @param stride_y  Stride of height
+ */
 void dl_matrix3dqq_conv_3x3_op(dl_matrix3dq_t *out,
                                dl_matrix3dq_t *in,
-                               dl_matrix3dq_t *f,
+                               dl_matrix3dq_t *filter,
                                int stride_x,
                                int stride_y);
 
+/**
+ * @brief Do 3x3 convolution with a quantized matrix
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (n, 3, 3, c)
+ * @param stride_x  Stride of width
+ * @param stride_y  Stride of height
+ * @param padding   Padding type, 0: valid, 1: same
+ * @param exponent  Exponent for resulting matrix
+ * @return          Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_conv_3x3(dl_matrix3dq_t *in,
                                        dl_matrix3dq_t *filter,
                                        int stride_x,
@@ -191,6 +362,18 @@ dl_matrix3dq_t *dl_matrix3dqq_conv_3x3(dl_matrix3dq_t *in,
                                        dl_padding_type padding,
                                        int exponent);
 
+/**
+ * @brief Do 3x3 convolution with a quantized matrix, with bias adding
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (n, 3, 3, c)
+ * @param bias      Bias, size (1, 1, 1, n)
+ * @param stride_x  Stride of width
+ * @param stride_y  Stride of height
+ * @param padding   Padding type, 0: valid, 1: same
+ * @param exponent  Exponent for resulting matrix
+ * @return          Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_conv_3x3_with_bias(dl_matrix3dq_t *in,
                                                  dl_matrix3dq_t *f,
                                                  dl_matrix3dq_t *bias,
@@ -224,7 +407,7 @@ dl_matrix3dq_t *dl_matrix3duq_conv_3x3_with_bias_prelu(dl_matrix3du_t *in,
 //
 
 /**
- * @brief Do a general CNN layer pass, dimension is (number, width, height, channel)
+ * @brief Do a general convolution layer pass, size is (number, width, height, channel)
  *
  * @param in             Input image
  * @param filter         Weights of the neurons
@@ -245,6 +428,19 @@ dl_matrix3dq_t *dl_matrix3dqq_conv_common(dl_matrix3dq_t *in,
                                           int exponent,
                                           dl_conv_mode mode);
 
+/**
+ * @brief Do a general convolution layer pass for an 8-bit fixed point matrix, size is (number, width, height, channel)
+ *
+ * @param in             Input image
+ * @param filter         Weights of the neurons
+ * @param bias           Bias for the CNN layer.
+ * @param stride_x       The step length of the convolution window in x(width) direction
+ * @param stride_y       The step length of the convolution window in y(height) direction
+ * @param padding        One of VALID or SAME
+ * @param mode           Do convolution using C implement or xtensa implement, 0 or 1, with respect.
+ *                       If ESP_PLATFORM is not defined, this value is not used.
+ * @return               The result of CNN layer.
+ */
 dl_matrix3dq_t *dl_matrix3duq_conv_common(dl_matrix3du_t *in,
                                           dl_matrix3dq_t *filter,
                                           dl_matrix3dq_t *bias,
@@ -257,6 +453,17 @@ dl_matrix3dq_t *dl_matrix3duq_conv_common(dl_matrix3du_t *in,
 //
 // Depthwise 3x3
 //
+/**
+ * @brief Do 3x3 depthwise convolution with an 8-bit fixed point matrix
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (1, 3, 3, c)
+ * @param stride_x  Stride of width
+ * @param stride_y  Stride of height
+ * @param padding   Padding type, 0: valid, 1: same
+ * @param exponent  Exponent for resulting matrix
+ * @return          Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3duq_depthwise_conv_3x3(dl_matrix3du_t *in,
                                                  dl_matrix3dq_t *filter,
                                                  int stride_x,
@@ -264,6 +471,17 @@ dl_matrix3dq_t *dl_matrix3duq_depthwise_conv_3x3(dl_matrix3du_t *in,
                                                  dl_padding_type padding,
                                                  int exponent);
 
+/**
+ * @brief Do 3x3 depthwise convolution with a quantized matrix
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (1, 3, 3, c)
+ * @param stride_x  Stride of width
+ * @param stride_y  Stride of height
+ * @param padding   Padding type, 0: valid, 1: same
+ * @param exponent  Exponent for resulting matrix
+ * @return          Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3(dl_matrix3dq_t *in,
                                                  dl_matrix3dq_t *filter,
                                                  int stride_x,
@@ -287,14 +505,45 @@ dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3_3(dl_matrix3dq_t *in,
                                                    int exponent);
 #endif
 
+/**
+ * @brief Do 3x3 depthwise convolution with a quantized matrix, with bias adding
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (1, 3, 3, c)
+ * @param bias      Bias, size (1, 1, 1, c)
+ * @param stride_x  Stride of width
+ * @param stride_y  Stride of height
+ * @param padding   Padding type, 0: valid, 1: same
+ * @param exponent  Exponent for resulting matrix
+ * @param relu      Whether to use relu activation
+ * @return          Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3_with_bias(dl_matrix3dq_t *in,
-                                                           dl_matrix3dq_t *f,
-                                                           dl_matrix3dq_t *bias,
-                                                           int stride_x,
-                                                           int stride_y,
-                                                           dl_padding_type padding,
-                                                           int exponent,
-                                                           int relu);
+                                                          dl_matrix3dq_t *f,
+                                                          dl_matrix3dq_t *bias,
+                                                          int stride_x,
+                                                          int stride_y,
+                                                          dl_padding_type padding,
+                                                          int exponent,
+                                                          int relu);
+
+/**
+ * @brief Do 3x3 depthwise convolution with a quantized matrix, with bias adding and stride 1
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @param filter    3x3 filter, size (1, 3, 3, c)
+ * @param bias      Bias, size (1, 1, 1, n)
+ * @param padding   Padding type, 0: valid, 1: same
+ * @param exponent  Exponent for resulting matrix
+ * @param relu      Whether to use relu activation
+ * @return          Resulting quantized matrix
+ */
+dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3s1_with_bias(dl_matrix3dq_t *in,
+                                                            dl_matrix3dq_t *f,
+                                                            dl_matrix3dq_t *bias,
+                                                            dl_padding_type padding,
+                                                            int exponent,
+                                                            int relu);
 
 dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3_with_prelu(dl_matrix3dq_t *in,
                                                             dl_matrix3dq_t *filter,
@@ -304,12 +553,6 @@ dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3_with_prelu(dl_matrix3dq_t *in,
                                                             dl_padding_type padding,
                                                             int exponent);
 
-dl_matrix3dq_t *dl_matrix3dqq_depthwise_conv_3x3s1_with_bias(dl_matrix3dq_t *in,
-                                                             dl_matrix3dq_t *f,
-                                                             dl_matrix3dq_t *bias,
-                                                             dl_padding_type padding,
-                                                             int exponent,
-                                                             int relu);
 
 //
 // Depthwise Common
@@ -344,12 +587,28 @@ void dl_matrix3dqq_dot_product(dl_matrix3dq_t *out,
 //
 // FC
 //
-
+/**
+ * @brief Do fully connected layer forward.
+ *
+ * @param out       Preallocated resulting matrix, size (1, 1, 1, h)
+ * @param in        Input matrix, size (1, 1, 1, w)
+ * @param filter    Filter matrix, size (1, w, h, 1)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3dqq_fc(dl_matrix3dq_t *out,
                       dl_matrix3dq_t *in,
                       dl_matrix3dq_t *filter,
                       dl_conv_mode mode);
 
+/**
+ * @brief Do fully connected layer forward, with bias adding
+ *
+ * @param out       Preallocated resulting matrix, size (1, 1, 1, h)
+ * @param in        Input matrix, size (1, 1, 1, w)
+ * @param filter    Filter matrix, size (1, w, h, 1)
+ * @param bias      Bias matrix, size (1, 1, 1, h)
+ * @param mode      Implementation mode
+ */
 void dl_matrix3dqq_fc_with_bias(dl_matrix3dq_t *out,
                                 dl_matrix3dq_t *in,
                                 dl_matrix3dq_t *filter,
@@ -360,7 +619,28 @@ void dl_matrix3dqq_fc_with_bias(dl_matrix3dq_t *out,
 //
 // Mobilefaceblock
 //
-
+/**
+ * @brief Do mobilefacenet process with splited pointwise 1x1 convolution, the process sequence is 1x1 pointwise->bn->relu->3x3 depthwise->bn->relu->1x1 pointwise->bn
+ *
+ * @param in                    Input matrix, size (1, w, h, c)
+ * @param pw_1                  Pointwise 1x1 filter, size (n1/2, 1, 1, c)
+ * @param pw_2                  Pointwise 1x1 filter, size (n1/2, 1, 1, c)
+ * @param pw_bias               Pointwise bias, size (1, 1, 1, n1)
+ * @param dw                    Depthwise 3x3 filter, size (1, 3, 3, n1)
+ * @param dw_bias               Depthwise bias, size (1, 1, 1, n1)
+ * @param pw_linear_1           Pointwise 1x1 filter, size (n2/2, 1, 1, n1)
+ * @param pw_linear_2           Pointwise 1x1 filter, size (n2/2, 1, 1, n1)
+ * @param pw_linear_bias        Pointwise bias, size (1, 1, 1, n2)
+ * @param pw_exponent           Exponent for pointwise resulting matrix
+ * @param dw_exponent           Exponent for depthwise resulting matrix
+ * @param pw_linear_exponent    Exponent for pointwise resulting matrix
+ * @param stride_x              Stride of width
+ * @param stride_y              Stride of height
+ * @param padding               Padding type, 0: valid, 1: same
+ * @param mode                  Implementation mode
+ * @param shortcut              Whether has a shortcut at pointwise linear
+ * @return                      Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_mobilefaceblock_split(dl_matrix3dq_t *in,
                                                     dl_matrix3dq_t *pw_1,
                                                     dl_matrix3dq_t *pw_2,
@@ -379,6 +659,26 @@ dl_matrix3dq_t *dl_matrix3dqq_mobilefaceblock_split(dl_matrix3dq_t *in,
                                                     dl_conv_mode mode,
                                                     int shortcut);
 
+/**
+ * @brief Do mobilefacenet process, the process sequence is 1x1 pointwise->bn->relu->3x3 depthwise->bn->relu->1x1 pointwise->bn
+ *
+ * @param in                    Input matrix, size (1, w, h, c)
+ * @param pw                    Pointwise 1x1 filter, size (n1, 1, 1, c)
+ * @param pw_bias               Pointwise bias, size (1, 1, 1, n1)
+ * @param dw                    Depthwise 3x3 filter, size (1, 3, 3, n1)
+ * @param dw_bias               Depthwise bias, size (1, 1, 1, n1)
+ * @param pw_linear             Pointwise 1x1 filter, size (n2, 1, 1, n1)
+ * @param pw_linear_bias        Pointwise bias, size (1, 1, 1, n2)
+ * @param pw_exponent           Exponent for pointwise resulting matrix
+ * @param dw_exponent           Exponent for depthwise resulting matrix
+ * @param pw_linear_exponent    Exponent for pointwise resulting matrix
+ * @param stride_x              Stride of width
+ * @param stride_y              Stride of height
+ * @param padding               Padding type, 0: valid, 1: same
+ * @param mode                  Implementation mode
+ * @param shortcut              Whether has a shortcut at pointwise linear
+ * @return                      Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_mobilefaceblock(dl_matrix3dq_t *in,
                                               dl_matrix3dq_t *pw,
                                               dl_matrix3dq_t *pw_bias,
@@ -399,6 +699,19 @@ dl_matrix3dq_t *dl_matrix3dqq_mobilefaceblock(dl_matrix3dq_t *in,
 // Mobilenet
 //
 
+/**
+ * @brief Do mobilenet process, the process sequence is 1x1 dilated->prelu->3x3 depthwise->prelu->1x1 compress->bias
+ *
+ * @param in                    Input matrix, size (1, w, h, c)
+ * @param dilate                Pointwise 1x1 filter, size (n1, 1, 1, c)
+ * @param dilate_prelu          Pointwise prelu, size (1, 1, 1, n1)
+ * @param depthwise             Depthwise 3x3 filter, size (1, 3, 3, n1)
+ * @param depthwise_prelu       Depthwise prelu, size (1, 1, 1, n1)
+ * @param compress              Pointwise 1x1 filter, size (n2, 1, 1, n1)
+ * @param bias                  Pointwise bias, size (1, 1, 1, n2)
+ * @param config                Mobilenet configuration
+ * @return                      Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3dqq_mobilenet(dl_matrix3dq_t *in,
                                         dl_matrix3dq_t *dilate,
                                         dl_matrix3dq_t *dilate_prelu,
@@ -409,6 +722,19 @@ dl_matrix3dq_t *dl_matrix3dqq_mobilenet(dl_matrix3dq_t *in,
                                         dl_matrix3dq_mobilenet_config_t config,
                                         char *name);
 
+/**
+ * @brief Do mobilenet process, the process sequence is 1x1 dilated->prelu->3x3 depthwise->prelu->1x1 compress->bias
+ *
+ * @param in                    Input matrix, 8-bit fixed point, size (1, w, h, c)
+ * @param dilate                Pointwise 1x1 filter, size (n1, 1, 1, c)
+ * @param dilate_prelu          Pointwise prelu, size (1, 1, 1, n1)
+ * @param depthwise             Depthwise 3x3 filter, size (1, 3, 3, n1)
+ * @param depthwise_prelu       Depthwise prelu, size (1, 1, 1, n1)
+ * @param compress              Pointwise 1x1 filter, size (n2, 1, 1, n1)
+ * @param bias                  Pointwise bias, size (1, 1, 1, n2)
+ * @param config                Mobilenet configuration
+ * @return                      Resulting quantized matrix
+ */
 dl_matrix3dq_t *dl_matrix3duq_mobilenet(dl_matrix3du_t *in,
                                         dl_matrix3dq_t *dilate,
                                         dl_matrix3dq_t *dilate_prelu,
@@ -444,5 +770,10 @@ dl_error_type dl_matrix3duq_padding(dl_matrix3du_t **padded_in,
 //
 // Pooling
 //
-
+/**
+ * @brief Calculate average value of a feature map
+ *
+ * @param in        Input matrix, size (1, w, h, c)
+ * @return          Resulting matrix, size (1, 1, 1, c)
+ */
 dl_matrix3dq_t *dl_matrix3dq_global_pool(dl_matrix3dq_t *in);
diff --git a/tools/sdk/include/esp-face/frmn.h b/tools/sdk/include/esp-face/frmn.h
index afdd253afcc..171f69ad885 100644
--- a/tools/sdk/include/esp-face/frmn.h
+++ b/tools/sdk/include/esp-face/frmn.h
@@ -9,23 +9,47 @@ extern "C"
 #include "dl_lib_matrix3dq.h"
 
     /**
-     * @brief 
-     * 
-     * @param in 
-     * @return dl_matrix3d_t* 
+     * @brief Forward the face recognition process with frmn model. Calculate in float.
+     *
+     * @param in    Image matrix, rgb888 format, size is 56x56, normalized
+     * @return dl_matrix3d_t* Face ID feature vector, size is 512
      */
     dl_matrix3d_t *frmn(dl_matrix3d_t *in);
 
     /**
-     * @brief 
-     * 
-     * @param in 
-     * @return dl_matrix3dq_t* 
+     * @brief Forward the face recognition process with frmn model. Calculate in quantization.
+     *
+     * @param in    Image matrix, rgb888 format, size is 56x56, normalized
+     * @param mode  0: C implement; 1: handwrite xtensa instruction implement
+     * @return      Face ID feature vector, size is 512
      */
     dl_matrix3dq_t *frmn_q(dl_matrix3dq_t *in, dl_conv_mode mode);
 
+    /**
+     * @brief Forward the face recognition process with frmn2 model. Calculate in quantization.
+     *
+     * @param in    Image matrix, rgb888 format, size is 56x56, normalized
+     * @param mode  0: C implement; 1: handwrite xtensa instruction implement
+     * @return      Face ID feature vector, size is 512
+     */
     dl_matrix3dq_t *frmn2_q(dl_matrix3dq_t *in, dl_conv_mode mode);
+
+    /**
+     * @brief Forward the face recognition process with frmn2p model. Calculate in quantization.
+     *
+     * @param in    Image matrix, rgb888 format, size is 56x56, normalized
+     * @param mode  0: C implement; 1: handwrite xtensa instruction implement
+     * @return      Face ID feature vector, size is 512
+     */
     dl_matrix3dq_t *frmn2p_q(dl_matrix3dq_t *in, dl_conv_mode mode);
+
+    /**
+     * @brief Forward the face recognition process with frmn2c model. Calculate in quantization.
+     *
+     * @param in    Image matrix, rgb888 format, size is 56x56, normalized
+     * @param mode  0: C implement; 1: handwrite xtensa instruction implement
+     * @return      Face ID feature vector, size is 512
+     */
     dl_matrix3dq_t *frmn2c_q(dl_matrix3dq_t *in, dl_conv_mode mode);
 
 #if __cplusplus
diff --git a/tools/sdk/include/esp-face/mtmn.h b/tools/sdk/include/esp-face/mtmn.h
index 144a5b97082..609a82ea488 100644
--- a/tools/sdk/include/esp-face/mtmn.h
+++ b/tools/sdk/include/esp-face/mtmn.h
@@ -30,18 +30,33 @@ extern "C"
 #include "dl_lib_matrix3d.h"
 #include "dl_lib_matrix3dq.h"
 
+    /**
+     * Detection results with MTMN.
+     *
+     */
     typedef struct
     {
-        dl_matrix3d_t *category;
-        dl_matrix3d_t *offset;
-        dl_matrix3d_t *landmark;
+        dl_matrix3d_t *category;    /*!< Classification result after softmax, channel is 2 */
+        dl_matrix3d_t *offset;      /*!< Bounding box offset of 2 points: top-left and bottom-right, channel is 4 */
+        dl_matrix3d_t *landmark;    /*!< Offsets of 5 landmarks:
+                                     * - Left eye
+                                     * - Mouth leftside
+                                     * - Nose
+                                     * - Right eye
+                                     * - Mouth rightside
+                                     *
+                                     * channel is 10
+                                     * */
     } mtmn_net_t;
 
+
     /**
      * @brief Free a mtmn_net_t
      *
      * @param p         A mtmn_net_t pointer
+     *
      */
+
     void mtmn_net_t_free(mtmn_net_t *p);
 
     /**
diff --git a/tools/sdk/include/esp32/esp_dport_access.h b/tools/sdk/include/esp32/esp_dport_access.h
index adbb8282012..8ea60c4cdb0 100644
--- a/tools/sdk/include/esp32/esp_dport_access.h
+++ b/tools/sdk/include/esp32/esp_dport_access.h
@@ -33,7 +33,7 @@ uint32_t esp_dport_access_sequence_reg_read(uint32_t reg);
 //only call in case of panic().
 void esp_dport_access_int_abort(void);
 
-#if defined(BOOTLOADER_BUILD) || defined(CONFIG_FREERTOS_UNICORE) || !defined(ESP_PLATFORM)
+#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
 #define DPORT_STALL_OTHER_CPU_START()
 #define DPORT_STALL_OTHER_CPU_END()
 #define DPORT_INTERRUPT_DISABLE()
@@ -41,7 +41,7 @@ void esp_dport_access_int_abort(void);
 #else
 #define DPORT_STALL_OTHER_CPU_START()   esp_dport_access_stall_other_cpu_start()
 #define DPORT_STALL_OTHER_CPU_END()     esp_dport_access_stall_other_cpu_end()
-#define DPORT_INTERRUPT_DISABLE()       unsigned int intLvl = XTOS_SET_INTLEVEL(XCHAL_EXCM_LEVEL)
+#define DPORT_INTERRUPT_DISABLE()       unsigned int intLvl = XTOS_SET_INTLEVEL(CONFIG_ESP32_DPORT_DIS_INTERRUPT_LVL)
 #define DPORT_INTERRUPT_RESTORE()       XTOS_RESTORE_JUST_INTLEVEL(intLvl)
 #endif
 
diff --git a/tools/sdk/include/json/cJSON.h b/tools/sdk/include/json/cJSON.h
index 52101e11793..592986b86e9 100644
--- a/tools/sdk/include/json/cJSON.h
+++ b/tools/sdk/include/json/cJSON.h
@@ -28,10 +28,60 @@ extern "C"
 {
 #endif
 
+#if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
+#define __WINDOWS__
+#endif
+
+#ifdef __WINDOWS__
+
+/* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention.  For windows you have 3 define options:
+
+CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
+CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
+CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
+
+For *nix builds that support visibility attribute, you can define similar behavior by
+
+setting default visibility to hidden by adding
+-fvisibility=hidden (for gcc)
+or
+-xldscope=hidden (for sun cc)
+to CFLAGS
+
+then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
+
+*/
+
+#define CJSON_CDECL __cdecl
+#define CJSON_STDCALL __stdcall
+
+/* export symbols by default, this is necessary for copy pasting the C and header file */
+#if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_EXPORT_SYMBOLS
+#endif
+
+#if defined(CJSON_HIDE_SYMBOLS)
+#define CJSON_PUBLIC(type)   type CJSON_STDCALL
+#elif defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllexport) type CJSON_STDCALL
+#elif defined(CJSON_IMPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllimport) type CJSON_STDCALL
+#endif
+#else /* !__WINDOWS__ */
+#define CJSON_CDECL
+#define CJSON_STDCALL
+
+#if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
+#define CJSON_PUBLIC(type)   __attribute__((visibility("default"))) type
+#else
+#define CJSON_PUBLIC(type) type
+#endif
+#endif
+
 /* project version */
 #define CJSON_VERSION_MAJOR 1
 #define CJSON_VERSION_MINOR 7
-#define CJSON_VERSION_PATCH 1
+#define CJSON_VERSION_PATCH 12
 
 #include <stddef.h>
 
@@ -74,55 +124,13 @@ typedef struct cJSON
 
 typedef struct cJSON_Hooks
 {
-      void *(*malloc_fn)(size_t sz);
-      void (*free_fn)(void *ptr);
+      /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
+      void *(CJSON_CDECL *malloc_fn)(size_t sz);
+      void (CJSON_CDECL *free_fn)(void *ptr);
 } cJSON_Hooks;
 
 typedef int cJSON_bool;
 
-#if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
-#define __WINDOWS__
-#endif
-#ifdef __WINDOWS__
-
-/* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention.  For windows you have 2 define options:
-
-CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
-CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
-CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
-
-For *nix builds that support visibility attribute, you can define similar behavior by
-
-setting default visibility to hidden by adding
--fvisibility=hidden (for gcc)
-or
--xldscope=hidden (for sun cc)
-to CFLAGS
-
-then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
-
-*/
-
-/* export symbols by default, this is necessary for copy pasting the C and header file */
-#if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
-#define CJSON_EXPORT_SYMBOLS
-#endif
-
-#if defined(CJSON_HIDE_SYMBOLS)
-#define CJSON_PUBLIC(type)   type __stdcall
-#elif defined(CJSON_EXPORT_SYMBOLS)
-#define CJSON_PUBLIC(type)   __declspec(dllexport) type __stdcall
-#elif defined(CJSON_IMPORT_SYMBOLS)
-#define CJSON_PUBLIC(type)   __declspec(dllimport) type __stdcall
-#endif
-#else /* !WIN32 */
-#if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
-#define CJSON_PUBLIC(type)   __attribute__((visibility("default"))) type
-#else
-#define CJSON_PUBLIC(type) type
-#endif
-#endif
-
 /* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
  * This is to prevent stack overflows. */
 #ifndef CJSON_NESTING_LIMIT
@@ -156,7 +164,7 @@ CJSON_PUBLIC(void) cJSON_Delete(cJSON *c);
 
 /* Returns the number of items in an array (or object). */
 CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
-/* Retrieve item number "item" from array "array". Returns NULL if unsuccessful. */
+/* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
 CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
 /* Get item "string" from object. Case insensitive. */
 CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
diff --git a/tools/sdk/include/json/cJSON_Utils.h b/tools/sdk/include/json/cJSON_Utils.h
index 03ec10c9e2c..a970c650467 100644
--- a/tools/sdk/include/json/cJSON_Utils.h
+++ b/tools/sdk/include/json/cJSON_Utils.h
@@ -20,6 +20,14 @@
   THE SOFTWARE.
 */
 
+#ifndef cJSON_Utils__h
+#define cJSON_Utils__h
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #include "cJSON.h"
 
 /* Implement RFC6901 (https://tools.ietf.org/html/rfc6901) JSON Pointer spec. */
@@ -72,3 +80,9 @@ CJSON_PUBLIC(char *) cJSONUtils_FindPointerFromObjectTo(const cJSON * const obje
 /* Sorts the members of the object into alphabetical order. */
 CJSON_PUBLIC(void) cJSONUtils_SortObject(cJSON * const object);
 CJSON_PUBLIC(void) cJSONUtils_SortObjectCaseSensitive(cJSON * const object);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/tools/sdk/include/soc/soc/dport_access.h b/tools/sdk/include/soc/soc/dport_access.h
index 00e7c838105..2639e46ef14 100644
--- a/tools/sdk/include/soc/soc/dport_access.h
+++ b/tools/sdk/include/soc/soc/dport_access.h
@@ -48,7 +48,7 @@ extern "C" {
 //    After completing read operations, use DPORT_STALL_OTHER_CPU_END().
 //    This method uses stall other CPU while reading DPORT registers.
 //    Useful for compatibility, as well as for large consecutive readings.
-//    This method is slower, but must be used if ROM functions or 
+//    This method is slower, but must be used if ROM functions or
 //    other code is called which accesses DPORT without any other workaround.
 // *) The pre-readable APB register before reading the DPORT register
 //    helps synchronize the operation of the two CPUs,
@@ -73,7 +73,7 @@ extern "C" {
  */
 static inline uint32_t IRAM_ATTR DPORT_REG_READ(uint32_t reg)
 {
-#if defined(BOOTLOADER_BUILD) || defined(CONFIG_FREERTOS_UNICORE) || !defined(ESP_PLATFORM)
+#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
     return _DPORT_REG_READ(reg);
 #else
     return esp_dport_access_reg_read(reg);
@@ -106,7 +106,7 @@ static inline uint32_t IRAM_ATTR DPORT_REG_READ(uint32_t reg)
  */
 static inline uint32_t IRAM_ATTR DPORT_SEQUENCE_REG_READ(uint32_t reg)
 {
-#if defined(BOOTLOADER_BUILD) || defined(CONFIG_FREERTOS_UNICORE) || !defined(ESP_PLATFORM)
+#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
     return _DPORT_REG_READ(reg);
 #else
     return esp_dport_access_sequence_reg_read(reg);
@@ -166,7 +166,7 @@ static inline uint32_t IRAM_ATTR DPORT_SEQUENCE_REG_READ(uint32_t reg)
  */
 static inline uint32_t IRAM_ATTR DPORT_READ_PERI_REG(uint32_t reg)
 {
-#if defined(BOOTLOADER_BUILD) || defined(CONFIG_FREERTOS_UNICORE) || !defined(ESP_PLATFORM)
+#if defined(BOOTLOADER_BUILD) || !defined(CONFIG_ESP32_DPORT_WORKAROUND) || !defined(ESP_PLATFORM)
     return _DPORT_REG_READ(reg);
 #else
     return esp_dport_access_reg_read(reg);
diff --git a/tools/sdk/include/soc/soc/soc.h b/tools/sdk/include/soc/soc/soc.h
index 96dea802324..d1d468303cc 100644
--- a/tools/sdk/include/soc/soc/soc.h
+++ b/tools/sdk/include/soc/soc/soc.h
@@ -147,7 +147,7 @@
 
 #define IS_DPORT_REG(_r) (((_r) >= DR_REG_DPORT_BASE) && (_r) <= DR_REG_DPORT_END)
 
-#if !defined( BOOTLOADER_BUILD ) && !defined( CONFIG_FREERTOS_UNICORE ) && defined( ESP_PLATFORM )
+#if !defined( BOOTLOADER_BUILD ) && defined( CONFIG_ESP32_DPORT_WORKAROUND ) && defined( ESP_PLATFORM )
 #define ASSERT_IF_DPORT_REG(_r, OP)  TRY_STATIC_ASSERT(!IS_DPORT_REG(_r), (Cannot use OP for DPORT registers use DPORT_##OP));
 #else
 #define ASSERT_IF_DPORT_REG(_r, OP)
diff --git a/tools/sdk/lib/libapp_trace.a b/tools/sdk/lib/libapp_trace.a
index fd4556cb532..4857b5afedf 100644
Binary files a/tools/sdk/lib/libapp_trace.a and b/tools/sdk/lib/libapp_trace.a differ
diff --git a/tools/sdk/lib/libapp_update.a b/tools/sdk/lib/libapp_update.a
index 7feaa11090a..9ead7d8c63c 100644
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diff --git a/tools/sdk/lib/libasio.a b/tools/sdk/lib/libasio.a
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index f347dae9f42..cccbbb0f7cf 100644
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diff --git a/tools/sdk/lib/libwpa_supplicant.a b/tools/sdk/lib/libwpa_supplicant.a
index 5631572f24c..15535d887ec 100644
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diff --git a/tools/sdk/lib/libxtensa-debug-module.a b/tools/sdk/lib/libxtensa-debug-module.a
index 34567ef6258..6b32ff1dce0 100644
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diff --git a/tools/sdk/sdkconfig b/tools/sdk/sdkconfig
index 97cab6898f5..08e8142f7a4 100644
--- a/tools/sdk/sdkconfig
+++ b/tools/sdk/sdkconfig
@@ -2,6 +2,7 @@
 # Automatically generated file; DO NOT EDIT.
 # Espressif IoT Development Framework Configuration
 #
+CONFIG_IDF_FIRMWARE_CHIP_ID=0x0000
 
 #
 # SDK tool configuration
@@ -272,6 +273,12 @@ CONFIG_FRMN2C_QUANT=
 #
 # ESP32-specific
 #
+CONFIG_ESP32_REV_MIN_0=y
+CONFIG_ESP32_REV_MIN_1=
+CONFIG_ESP32_REV_MIN_2=
+CONFIG_ESP32_REV_MIN_3=
+CONFIG_ESP32_REV_MIN=0
+CONFIG_ESP32_DPORT_WORKAROUND=y
 CONFIG_ESP32_DEFAULT_CPU_FREQ_80=
 CONFIG_ESP32_DEFAULT_CPU_FREQ_160=
 CONFIG_ESP32_DEFAULT_CPU_FREQ_240=y
@@ -386,6 +393,7 @@ CONFIG_DISABLE_BASIC_ROM_CONSOLE=
 CONFIG_ESP_TIMER_PROFILING=
 CONFIG_COMPATIBLE_PRE_V2_1_BOOTLOADERS=
 CONFIG_ESP_ERR_TO_NAME_LOOKUP=y
+CONFIG_ESP32_DPORT_DIS_INTERRUPT_LVL=5
 
 #
 # Wi-Fi