diff --git a/components/bootloader/Kconfig.projbuild b/components/bootloader/Kconfig.projbuild
index 5d2dad2e..50c7633c 100644
--- a/components/bootloader/Kconfig.projbuild
+++ b/components/bootloader/Kconfig.projbuild
@@ -19,6 +19,13 @@ config BOOTLOADER_DISABLE_JTAG_IO
 
         If users use JTAG to help develop, please disable this option.
 
+config BOOTLOADER_FAST_BOOT
+    bool "Bootloader fast boot"
+    default n
+    help
+        Enable this option, after initializing hardware, bootloader will try to load boot image
+        information from RTC memory directly and then run image without verifying it.
+
 choice LOG_BOOTLOADER_LEVEL
    bool "Bootloader log verbosity"
    default LOG_BOOTLOADER_LEVEL_INFO
diff --git a/components/bootloader/subproject/main/bootloader_start.c b/components/bootloader/subproject/main/bootloader_start.c
index cdcc9b20..3ba0adde 100644
--- a/components/bootloader/subproject/main/bootloader_start.c
+++ b/components/bootloader/subproject/main/bootloader_start.c
@@ -30,11 +30,19 @@ static int selected_boot_partition(const bootloader_state_t *bs);
 
 void call_start_cpu(void)
 {
+#ifdef CONFIG_BOOTLOADER_FAST_BOOT
+    REG_SET_BIT(DPORT_CTL_REG, DPORT_CTL_DOUBLE_CLK);
+#endif
+
     // 1. Hardware initialization
     if(bootloader_init() != ESP_OK){
         return;
     }
 
+#ifdef CONFIG_BOOTLOADER_FAST_BOOT
+    bootloader_utility_fast_boot_image();
+#endif
+
     // 2. Select image to boot
     esp_image_metadata_t image_data;
     if(select_image(&image_data) != ESP_OK){
diff --git a/components/bootloader_support/include_priv/bootloader_utility.h b/components/bootloader_support/include_priv/bootloader_utility.h
index 6cf6a77e..a2bc8328 100644
--- a/components/bootloader_support/include_priv/bootloader_utility.h
+++ b/components/bootloader_support/include_priv/bootloader_utility.h
@@ -62,3 +62,8 @@ bool bootloader_utility_load_boot_image(const bootloader_state_t *bs, int start_
  * @param[in] data Structure to hold on-flash image metadata.
  */
 void bootloader_utility_load_image(const esp_image_metadata_t* image_data);
+
+/**
+ * @brief Loading boot image information from RTC memory and then running image without verifying.
+ */
+void bootloader_utility_fast_boot_image(void);
diff --git a/components/bootloader_support/src/bootloader_utility.c b/components/bootloader_support/src/bootloader_utility.c
index a792caf8..da06ce3d 100644
--- a/components/bootloader_support/src/bootloader_utility.c
+++ b/components/bootloader_support/src/bootloader_utility.c
@@ -493,6 +493,7 @@ static void set_cache_and_start_app(
 #include "esp_log.h"
 
 #include "esp_flash_partitions.h"
+#include "esp_fast_boot.h"
 #include "internal/esp_system_internal.h"
 
 static const char* TAG = "boot";
@@ -743,6 +744,16 @@ static bool try_load_partition(const esp_partition_pos_t *partition, esp_image_m
 
 #define TRY_LOG_FORMAT "Trying partition index %d offs 0x%x size 0x%x"
 
+static void bootloader_utility_start_image(uint32_t image_start, uint32_t image_size, uint32_t entry_addr)
+{
+    void (*user_start)(size_t start_addr);
+
+    bootloader_mmap(image_start, image_size);
+
+    user_start = (void *)entry_addr;
+    user_start(image_start);
+}
+
 bool bootloader_utility_load_boot_image(const bootloader_state_t *bs, int start_index, esp_image_metadata_t *result)
 {
     int index = start_index;
@@ -793,8 +804,6 @@ bool bootloader_utility_load_boot_image(const bootloader_state_t *bs, int start_
 
 void bootloader_utility_load_image(const esp_image_metadata_t* image_data)
 {
-    void (*user_start)(size_t start_addr);
-
 #if defined(CONFIG_SECURE_BOOT_ENABLED) || defined(CONFIG_FLASH_ENCRYPTION_ENABLED)
     esp_err_t err;
 #endif
@@ -838,11 +847,18 @@ void bootloader_utility_load_image(const esp_image_metadata_t* image_data)
     copy loaded segments to RAM, set up caches for mapped segments, and start application
     unpack_load_app(image_data);
 #else
-    bootloader_mmap(image_data->start_addr, image_data->image_len);
-
-    user_start = (void *)image_data->image.entry_addr;
-    user_start(image_data->start_addr);
+    bootloader_utility_start_image(image_data->start_addr, image_data->image_len, image_data->image.entry_addr);
 #endif /* BOOTLOADER_UNPACK_APP */
 }
 
+void bootloader_utility_fast_boot_image(void)
+{
+    uint32_t image_start, image_size, image_entry;
+
+    if (!esp_fast_boot_get_info(&image_start, &image_size, &image_entry)) {
+        bootloader_utility_start_image(image_start, image_size, image_entry);
+    }
+
+    ESP_LOGD(TAG, "fast boot image fail");
+}
 #endif
diff --git a/components/esp8266/CMakeLists.txt b/components/esp8266/CMakeLists.txt
index 882519a6..bb436422 100644
--- a/components/esp8266/CMakeLists.txt
+++ b/components/esp8266/CMakeLists.txt
@@ -2,7 +2,7 @@ if(BOOTLOADER_BUILD)
     # For bootloader, all we need from esp8266 is headers
     set(COMPONENT_ADD_INCLUDEDIRS include)
     # set(COMPONENT_REQUIRES ${COMPONENTS})
-    set(COMPONENT_SRCS source/ets_printf.c source/crc.c)
+    set(COMPONENT_SRCS source/ets_printf.c source/crc.c source/esp_fast_boot.c)
     register_component(esp8266)
 
     # as cmake won't attach linker args to a header-only library, attach
@@ -37,6 +37,7 @@ else()
         "source/task_wdt.c"
         "source/rom.c"
         "source/hw_random.c"
+        "source/esp_fast_boot.c"
         "driver/adc.c"
         "driver/gpio.c"
         "driver/hw_timer.c"
@@ -53,7 +54,7 @@ else()
     set(include_dirs "include" "include/driver")
 
     set(requires "esp_common" "esp_event")
-    set(priv_requires "wpa_supplicant" "log" "spi_flash" "tcpip_adapter" "esp_ringbuf" "bootloader_support" "nvs_flash")
+    set(priv_requires "wpa_supplicant" "log" "spi_flash" "tcpip_adapter" "esp_ringbuf" "bootloader_support" "nvs_flash" "app_update")
     set(fragments linker.lf ld/esp8266_fragments.lf ld/esp8266_bss_fragments.lf)
 
     idf_component_register(SRCS "${srcs}"
diff --git a/components/esp8266/component.mk b/components/esp8266/component.mk
index dfcc9331..44c86d4b 100644
--- a/components/esp8266/component.mk
+++ b/components/esp8266/component.mk
@@ -2,7 +2,7 @@
 # Component Makefile
 #
 ifdef IS_BOOTLOADER_BUILD
-COMPONENT_OBJS := source/ets_printf.o source/crc.o
+COMPONENT_OBJS := source/ets_printf.o source/crc.o source/esp_fast_boot.o
 COMPONENT_SRCDIRS := source
 else
 COMPONENT_ADD_INCLUDEDIRS += include
diff --git a/components/esp8266/include/esp8266/eagle_soc.h b/components/esp8266/include/esp8266/eagle_soc.h
index 2fc00d91..97aab970 100644
--- a/components/esp8266/include/esp8266/eagle_soc.h
+++ b/components/esp8266/include/esp8266/eagle_soc.h
@@ -205,6 +205,9 @@
 #define CACHE_READ_EN_BIT               BIT8
 //}}
 
+#define ESP_CACHE1_ADDR_MAX             (0x100000)
+#define ESP_CACHE2_ADDR_MAX             (0x200000)
+
 #define DRAM_BASE                       (0x3FFE8000)
 #define DRAM_SIZE                       (96 * 1024)
 
diff --git a/components/esp8266/include/esp8266/rom_functions.h b/components/esp8266/include/esp8266/rom_functions.h
index 012fde05..1c5a5d68 100644
--- a/components/esp8266/include/esp8266/rom_functions.h
+++ b/components/esp8266/include/esp8266/rom_functions.h
@@ -1,9 +1,16 @@
 #ifndef _ROM_FUNCTIONS_H
 #define _ROM_FUNCTIONS_H
 
+#include "sdkconfig.h"
 #include <stdint.h>
 #include <stdarg.h>
 
+#ifdef CONFIG_SOC_FULL_ICACHE
+#define SOC_CACHE_SIZE 1 // 32KB
+#else
+#define SOC_CACHE_SIZE 0 // 16KB
+#endif
+
 #define ROM_FLASH_BUF_DECLARE(__name, __size) uint8_t __name[__size] __attribute__((aligned(4)))
 
 typedef struct {
diff --git a/components/esp8266/include/esp_fast_boot.h b/components/esp8266/include/esp_fast_boot.h
new file mode 100644
index 00000000..7aca7ec4
--- /dev/null
+++ b/components/esp8266/include/esp_fast_boot.h
@@ -0,0 +1,87 @@
+// Copyright 2020-2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#ifndef BOOTLOADER_BUILD
+#include "esp_partition.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef BOOTLOADER_BUILD
+/**
+ * @brief Setting target partition as fast boot partition and enable fast boot function.
+ * 
+ * @param partition partition which has image to be booted
+ *
+ * @return
+ *      - 0 on success
+ *      - -EINVAL parameter error
+ *      - -EIO read flash error
+ */
+int esp_fast_boot_enable_partition(const esp_partition_t *partition);
+
+/**
+ * @brief Setting current running partition as fast boot partition and enable fast boot function.
+ *
+ * @return
+ *      - 0 on success
+ *      - -EINVAL current running partition information error
+ *      - -EIO read flash error
+ */
+int esp_fast_boot_enable(void);
+
+/**
+ * @brief Directly running the image which is to be booted after restart.
+ * 
+ * @note It is just like jumping directly from one APP to another one without running ROM bootloader and level 2 bootloader.
+ *       Using this API, system starting up is fastest.
+ *
+ * @return
+ *      - 0 on success
+ *      - -EINVAL booted partition information error
+ *      - -EIO read flash error
+ */
+int esp_fast_boot_restart(void);
+#endif
+
+/**
+ * @brief Disabling fast boot function and bootloader will not boot fast.
+ */
+void esp_fast_boot_disable(void);
+
+/**
+ * @brief Getting fast boot information.
+ * 
+ * @param image_start image startting address in the SPI Flash
+ * @param image_size  image max size in the SPI Flash
+ * @param image_entry image entry address in the SPI Flash
+ * 
+ * @return
+ *      - 0 on success
+ *      - -EINVAL fast boot information error
+ */
+int esp_fast_boot_get_info(uint32_t *image_start, uint32_t *image_size, uint32_t *image_entry);
+
+/**
+ * @brief Printing fast boot information.
+ */
+void esp_fast_boot_print_info(void);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/components/esp8266/include/esp_system.h b/components/esp8266/include/esp_system.h
index 06d2f52c..dfdf4f47 100644
--- a/components/esp8266/include/esp_system.h
+++ b/components/esp8266/include/esp_system.h
@@ -50,6 +50,7 @@ typedef enum {
     ESP_RST_DEEPSLEEP,      //!< Reset after exiting deep sleep mode
     ESP_RST_BROWNOUT,       //!< Brownout reset (software or hardware)
     ESP_RST_SDIO,           //!< Reset over SDIO
+    ESP_RST_FAST_SW,        //!< Fast reboot
 } esp_reset_reason_t;
 
 /**
@@ -187,6 +188,13 @@ uint32_t esp_random(void);
  */
 void esp_fill_random(void *buf, size_t len);
 
+/**
+ * @brief Initialize MAC address
+ * 
+ * @return 0 if sucess or others failed
+ */
+esp_err_t esp_mac_init(void);
+
 typedef enum {
     FLASH_SIZE_4M_MAP_256_256 = 0,  /**<  Flash size : 4Mbits. Map : 256KBytes + 256KBytes */
     FLASH_SIZE_2M,                  /**<  Flash size : 2Mbits. Map : 256KBytes */
diff --git a/components/esp8266/include/internal/esp_system_internal.h b/components/esp8266/include/internal/esp_system_internal.h
index 37702e77..ff468302 100644
--- a/components/esp8266/include/internal/esp_system_internal.h
+++ b/components/esp8266/include/internal/esp_system_internal.h
@@ -22,6 +22,7 @@ extern "C" {
 #endif
 
 #define RTC_SYS_RAM_SIZE            256
+#define ESP_SYSTEM_FAST_BOOT_IMAGE  0x5aa5a55a
 
 /**
  * @brief Station's AP base information of old SDK
@@ -50,6 +51,13 @@ struct _rtc_sys_info {
     uint32_t        hint;   // software reset reason
     uint32_t        old_sysconf_addr;   /*<! old SDK system configuration parameters base address, 
                                              if your bootloader is older than v3.2, please don't use this */
+    struct {
+        uint32_t    magic;
+        uint32_t    image_start;
+        uint32_t    image_size;
+        uint32_t    image_entry;
+        uint32_t    crc32;
+    } fast_boot;
 };
 
 /**
diff --git a/components/esp8266/include/rom/uart.h b/components/esp8266/include/rom/uart.h
index 8f66155a..8a99f37b 100644
--- a/components/esp8266/include/rom/uart.h
+++ b/components/esp8266/include/rom/uart.h
@@ -101,6 +101,11 @@ static inline STATUS UartRxString(uint8_t *pString, uint8_t MaxStrlen)
     return OK;
 }
 
+/**
+  * @brief Disable UART0 I/O swap and don't care about if TX FIFO is empty
+  */
+void uart_disable_swap_io(void);
+
 /**
   * @}
   */
diff --git a/components/esp8266/source/esp_fast_boot.c b/components/esp8266/source/esp_fast_boot.c
new file mode 100644
index 00000000..7f562ef3
--- /dev/null
+++ b/components/esp8266/source/esp_fast_boot.c
@@ -0,0 +1,205 @@
+// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// #define LOG_LOCAL_LEVEL ESP_LOG_ERROR
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/errno.h>
+#include "esp_log.h"
+#include "rom/crc.h"
+#include "internal/esp_system_internal.h"
+#include "esp_fast_boot.h"
+#ifndef BOOTLOADER_BUILD
+#include "esp_ota_ops.h"
+#include "esp_image_format.h"
+#include "esp_wifi.h"
+#include "esp_system.h"
+#include "esp8266/rom_functions.h"
+#include "esp8266/eagle_soc.h"
+#include "rom/uart.h"
+#include "esp_spi_flash.h"
+#include "FreeRTOS.h"
+#include "task.h"
+#endif
+
+static char *TAG = "fast_boot";
+
+#ifndef BOOTLOADER_BUILD
+int esp_fast_boot_enable_partition(const esp_partition_t *partition)
+{
+    int ret;
+    esp_image_header_t image;
+
+    if (!partition || partition->type != ESP_PARTITION_TYPE_APP)
+        return -EINVAL;
+
+    ret = spi_flash_read(partition->address, &image, sizeof(esp_image_header_t));
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "read image head from spi flash error");
+        return -EIO;
+    }
+
+    rtc_sys_info.fast_boot.image_start = partition->address;
+    rtc_sys_info.fast_boot.image_size = partition->size - 4;
+    rtc_sys_info.fast_boot.image_entry = image.entry_addr;
+    rtc_sys_info.fast_boot.magic = ESP_SYSTEM_FAST_BOOT_IMAGE;
+    rtc_sys_info.fast_boot.crc32 = crc32_le(UINT32_MAX, (uint8_t *)&rtc_sys_info.fast_boot, sizeof(rtc_sys_info.fast_boot) - 4);
+
+    return 0;
+}
+
+int esp_fast_boot_enable(void)
+{
+    const esp_partition_t *running = esp_ota_get_running_partition();
+
+    return esp_fast_boot_enable_partition(running);
+}
+
+void IRAM_ATTR esp_fast_boot_restart_app(uint32_t image_start, uint32_t entry_addr, uint8_t region, uint8_t sub_region)
+{
+    const uint32_t sp = DRAM_BASE + DRAM_SIZE - 16;
+    void (*user_start)(size_t start_addr);
+
+    Cache_Read_Disable();
+    Cache_Read_Enable(sub_region, region, SOC_CACHE_SIZE);
+
+    __asm__ __volatile__(
+        "mov    a1, %0\n"
+        : : "a"(sp) : "memory"
+    );
+
+    user_start = (void *)entry_addr;
+    user_start(image_start);
+}
+
+int esp_fast_boot_restart(void)
+{
+    extern void pm_goto_rf_on(void);
+    extern void clockgate_watchdog(int on);
+
+    int ret;
+    uint8_t region, sub_region;
+    uint32_t image_start, image_size, image_entry, image_mask;
+    const esp_partition_t *to_boot;
+    esp_image_header_t image;
+
+    to_boot = esp_ota_get_boot_partition();
+    if (!to_boot) {
+        ESP_LOGI(TAG, "no OTA boot partition");
+        to_boot = esp_ota_get_running_partition();
+        if (!to_boot) {
+            ESP_LOGE(TAG, "ERROR: Fail to get running partition");
+            return -EINVAL;
+        }
+    }
+
+    image_start = to_boot->address;
+    image_size = to_boot->size - 4;
+
+    ret = spi_flash_read(image_start, &image, sizeof(esp_image_header_t));
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "ERROR: Fail to read image head from spi flash error=%d", ret);
+        return -EIO;
+    }
+
+    image_entry = image.entry_addr;
+
+    if (image_start < 0x200000) {
+        region = 0;
+    } else if (image_start < 0x400000) {
+        region = 1;
+    } else if (image_start < 0x600000) {
+        region = 2;
+    } else if (image_start < 0x800000) {
+        region = 3;
+    } else {
+        ESP_LOGE(TAG, "ERROR: App bin error, start_addr 0x%08x image_len %d\n", image_start, image_size);
+        return -EINVAL;
+    }
+
+    image_mask =  image_start & 0x1fffff;
+    if (image_mask < 0x100000) {
+        sub_region = 0;
+    } else {
+        sub_region = 1;
+    }
+
+    if (esp_wifi_stop() != ESP_OK) {
+        ESP_LOGD(TAG, "ERROR: Fail to stop Wi-Fi");
+    }
+
+    uart_tx_wait_idle(1);
+    uart_tx_wait_idle(0);
+
+    vTaskDelay(40 / portTICK_RATE_MS);
+
+    pm_goto_rf_on();
+    clockgate_watchdog(0);
+    REG_WRITE(0x3ff00018, 0xffff00ff);
+    SET_PERI_REG_MASK(0x60000D48, BIT1);
+    CLEAR_PERI_REG_MASK(0x60000D48, BIT1);
+
+    /* Get startup time */
+    //ets_printf("\nets\n");
+
+    uart_disable_swap_io();
+
+    vPortEnterCritical();
+    REG_WRITE(INT_ENA_WDEV, 0);
+    _xt_isr_mask(UINT32_MAX);
+
+    esp_reset_reason_set_hint(ESP_RST_FAST_SW);
+
+    esp_fast_boot_restart_app(image_start, image_entry, region, sub_region);
+
+    return 0;
+}
+#endif
+
+void esp_fast_boot_disable(void)
+{
+    memset(&rtc_sys_info.fast_boot, 0, sizeof(rtc_sys_info.fast_boot));
+}
+
+int esp_fast_boot_get_info(uint32_t *image_start, uint32_t *image_size, uint32_t *image_entry)
+{
+    if (rtc_sys_info.fast_boot.magic != ESP_SYSTEM_FAST_BOOT_IMAGE) {
+        ESP_LOGE(TAG, "magic error");
+        return -EINVAL;
+    }
+
+    if (rtc_sys_info.fast_boot.crc32 != crc32_le(UINT32_MAX, (uint8_t *)&rtc_sys_info.fast_boot, sizeof(rtc_sys_info.fast_boot) - 4)) {
+        ESP_LOGE(TAG, "CRC32 error");
+        esp_fast_boot_disable();
+        return -EINVAL;
+    }
+
+    *image_start = rtc_sys_info.fast_boot.image_start;
+    *image_size = rtc_sys_info.fast_boot.image_size;
+    *image_entry =  rtc_sys_info.fast_boot.image_entry;
+
+    esp_fast_boot_disable();
+
+    return 0;
+}
+
+void esp_fast_boot_print_info(void)
+{
+    ets_printf("\nmagic is %x\n", rtc_sys_info.fast_boot.magic);
+    ets_printf("image start is %x\n", rtc_sys_info.fast_boot.image_start);
+    ets_printf("image size is %x\n", rtc_sys_info.fast_boot.image_size);
+    ets_printf("image entry is %x\n", rtc_sys_info.fast_boot.image_entry);
+    ets_printf("CRC32 is %x\n", rtc_sys_info.fast_boot.crc32);
+}
diff --git a/components/esp8266/source/esp_wifi.c b/components/esp8266/source/esp_wifi.c
index b42a76cb..e1d1fab9 100644
--- a/components/esp8266/source/esp_wifi.c
+++ b/components/esp8266/source/esp_wifi.c
@@ -30,6 +30,7 @@ const bool _g_esp_wifi_connect_open_router_when_pwd_is_set = true;
 const bool _g_esp_wifi_connect_open_router_when_pwd_is_set = false;
 #endif
 
+esp_err_t mac_init(void);
 esp_err_t esp_wifi_init_internal(const wifi_init_config_t *config);
 
 ESP_EVENT_DEFINE_BASE(WIFI_EVENT);
@@ -129,6 +130,10 @@ static void esp_wifi_set_debug_log()
   */
 esp_err_t esp_wifi_init(const wifi_init_config_t *config)
 {
+    mac_init();
+
+    esp_wifi_set_rx_pbuf_mem_type(WIFI_RX_PBUF_DRAM);
+
     esp_err_t result = esp_wifi_init_internal(config);
     if (result == ESP_OK) {
         esp_wifi_set_debug_log();
diff --git a/components/esp8266/source/phy_init.c b/components/esp8266/source/phy_init.c
index 24247c9f..9fc23207 100644
--- a/components/esp8266/source/phy_init.c
+++ b/components/esp8266/source/phy_init.c
@@ -72,11 +72,6 @@ esp_err_t esp_phy_rf_init(const esp_phy_init_data_t* init_data, esp_phy_calibrat
     esp_err_t status = ESP_OK;
     uint8_t sta_mac[6];
     uint8_t *local_init_data = calloc(1, 256);
-#ifdef CONFIG_ESP_CONSOLE_UART_BAUDRATE
-    const uint32_t uart_baudrate = CONFIG_ESP_CONSOLE_UART_BAUDRATE;
-#else
-    const uint32_t uart_baudrate = 74880; // ROM default baudrate
-#endif
 
     memcpy(local_init_data, init_data->params, 128);
     memcpy(local_init_data + 128, calibration_data->rf_cal_data, 128);
@@ -102,12 +97,7 @@ esp_err_t esp_phy_rf_init(const esp_phy_init_data_t* init_data, esp_phy_calibrat
      * so UARTs must be flush here, then reconfigurate the UART frequency dividor
      */
     uart_tx_wait_idle(0);
-    uart_div_modify(0, UART_CLK_FREQ / uart_baudrate);
-
     uart_tx_wait_idle(1);
-    uart_div_modify(1, UART_CLK_FREQ / uart_baudrate);
-
-    rtc_init_clk(local_init_data);
 
     int ret = register_chipv6_phy(local_init_data);
     if (ret) {
diff --git a/components/esp8266/source/reset_reason.c b/components/esp8266/source/reset_reason.c
index e47d4d5a..b7956d4b 100644
--- a/components/esp8266/source/reset_reason.c
+++ b/components/esp8266/source/reset_reason.c
@@ -41,7 +41,7 @@ static inline void esp_reset_reason_clear_hint()
 
 static inline uint32_t esp_reset_reason_get_hint(uint32_t hw_reset)
 {
-    if (hw_reset == POWERON_RESET && rtc_sys_info.hint != ESP_RST_SW)
+    if (hw_reset == POWERON_RESET && ((rtc_sys_info.hint != ESP_RST_SW) && (rtc_sys_info.hint != ESP_RST_FAST_SW)))
         rtc_sys_info.hint = 0;
 
     return rtc_sys_info.hint;
@@ -63,7 +63,8 @@ static inline uint32_t get_reset_reason(uint32_t rtc_reset_reason, uint32_t rese
 {
     switch (rtc_reset_reason) {
         case POWERON_RESET:
-            if (reset_reason_hint == ESP_RST_SW)
+            if (reset_reason_hint == ESP_RST_SW ||
+                reset_reason_hint == ESP_RST_FAST_SW)
                 return reset_reason_hint;
             return ESP_RST_POWERON;
         case EXT_RESET:
@@ -108,7 +109,7 @@ static void __esp_reset_reason_init(int init)
     }
 
     if (init)
-        ESP_LOGI(TAG, "RTC reset %u wakeup %u store %u, reason is %u", hw_reset, hw_wakeup, hint, s_reset_reason);
+        ESP_LOGD(TAG, "RTC reset %u wakeup %u store %u, reason is %u", hw_reset, hw_wakeup, hint, s_reset_reason);
 }
 
 /**
diff --git a/components/esp8266/source/rom.c b/components/esp8266/source/rom.c
index 7369f09b..d8aa83db 100644
--- a/components/esp8266/source/rom.c
+++ b/components/esp8266/source/rom.c
@@ -31,3 +31,8 @@ void uart_tx_wait_idle(uint8_t uart_no)
 
     ets_delay_us(byte_delay_us);
 }
+
+void uart_disable_swap_io(void)
+{
+   CLEAR_PERI_REG_MASK(UART_SWAP_REG, 0x4);
+}
diff --git a/components/esp8266/source/startup.c b/components/esp8266/source/startup.c
index fb573d8a..6465cb4c 100644
--- a/components/esp8266/source/startup.c
+++ b/components/esp8266/source/startup.c
@@ -39,18 +39,10 @@
 #include "esp_newlib.h"
 #endif
 
-extern void chip_boot(void);
-extern int rtc_init(void);
-extern int mac_init(void);
-extern int base_gpio_init(void);
-extern int watchdog_init(void);
-extern int wifi_timer_init(void);
-extern int wifi_nvs_init(void);
 extern esp_err_t esp_pthread_init(void);
-extern void phy_get_bb_evm(void);
-extern void uart_div_modify(uint8_t uart_no, uint16_t DivLatchValue);
-/*Only for calling esp_wifi_set_ps can compile successfully */
-uint32_t LwipTimOutLim = 0;
+extern void chip_boot(void);
+extern int base_gpio_init(void);
+extern int rtc_init(void);
 
 static inline int should_load(uint32_t load_addr)
 {
@@ -73,23 +65,19 @@ static void user_init_entry(void *param)
     extern void (*__init_array_end)(void);
 
     extern void app_main(void);
+    extern uint32_t esp_get_time(void);
 
     /* initialize C++ construture function */
     for (func = &__init_array_start; func < &__init_array_end; func++)
         func[0]();
 
-    /*enable tsf0 interrupt for pwm*/
-    REG_WRITE(PERIPHS_DPORT_BASEADDR, (REG_READ(PERIPHS_DPORT_BASEADDR) & ~0x1F) | 0x1);
-    REG_WRITE(INT_ENA_WDEV, REG_READ(INT_ENA_WDEV) | WDEV_TSF0_REACH_INT);
-
-    assert(nvs_flash_init() == 0);
-    assert(rtc_init() == 0);
-    assert(mac_init() == 0);
+    rtc_init();
+    esp_phy_init_clk();
     assert(base_gpio_init() == 0);
 
-    esp_wifi_set_rx_pbuf_mem_type(WIFI_RX_PBUF_DRAM);
-
-    esp_phy_init_clk();
+    if (esp_reset_reason_early() != ESP_RST_FAST_SW) {
+        assert(esp_mac_init() == ESP_OK);
+    }
 
 #if CONFIG_RESET_REASON
     esp_reset_reason_init();
@@ -103,6 +91,10 @@ static void user_init_entry(void *param)
     assert(esp_pthread_init() == 0);
 #endif
 
+#ifdef CONFIG_BOOTLOADER_FAST_BOOT
+    REG_CLR_BIT(DPORT_CTL_REG, DPORT_CTL_DOUBLE_CLK);
+#endif
+
 #ifdef CONFIG_ESP8266_DEFAULT_CPU_FREQ_160
     esp_set_cpu_freq(ESP_CPU_FREQ_160M);
 #endif
@@ -120,6 +112,10 @@ void call_start_cpu(size_t start_addr)
     extern int _bss_start, _bss_end;
     extern int _iram_bss_start, _iram_bss_end;
 
+#ifdef CONFIG_BOOTLOADER_FAST_BOOT
+    REG_SET_BIT(DPORT_CTL_REG, DPORT_CTL_DOUBLE_CLK);
+#endif
+
     esp_image_header_t *head = (esp_image_header_t *)(FLASH_BASE + (start_addr & (FLASH_SIZE - 1)));
     esp_image_segment_header_t *segment = (esp_image_segment_header_t *)((uintptr_t)head + sizeof(esp_image_header_t));
 
diff --git a/components/esp8266/source/system_api.c b/components/esp8266/source/system_api.c
index 8bc65846..913e9502 100644
--- a/components/esp8266/source/system_api.c
+++ b/components/esp8266/source/system_api.c
@@ -313,6 +313,34 @@ esp_err_t esp_read_mac(uint8_t* mac, esp_mac_type_t type)
     return ESP_OK;
 }
 
+esp_err_t esp_mac_init(void)
+{
+    esp_err_t ret;
+    uint8_t efuse_mac[6];
+
+    if ((ret = nvs_flash_init()) != ESP_OK) {
+        ESP_LOGE(TAG, "Init NVS error=%d", ret);
+        return ESP_ERR_INVALID_MAC;
+    }
+
+    if (load_backup_mac_data(efuse_mac) == ESP_OK) {
+        ESP_LOGD(TAG, "Load MAC from NVS error=%d", ret);
+        return ESP_OK;
+    }
+
+    if ((ret = esp_efuse_mac_get_default(efuse_mac)) != ESP_OK) {
+        ESP_LOGE(TAG, "Get mac address error=%d", ret);
+        return ESP_ERR_INVALID_MAC;
+    }
+
+    if ((ret = store_backup_mac_data()) != ESP_OK) {
+        ESP_LOGE(TAG, "Store mac address error=%d", ret);
+        return ESP_ERR_INVALID_MAC;
+    }
+
+    return ESP_OK;
+}
+
 /**
  * Get IDF version
  */