引导加载程序镜像的格式

引导加载程序镜像与应用程序镜像具有相同的结构，参见应用程序镜像结构。二者唯一的区别在于描述引导加载程序的结构体不同。

要查看关于引导加载程序镜像的更多内容，请运行以下命令：

esptool.py --chip esp32s2 image_info build/bootloader/bootloader.bin --version 2

输出结果如下形式所示：

File size: 26576 (bytes)

ESP32 image header
==================
Image version: 1
Entry point: 0x40080658
Segments: 4
Flash size: 2MB
Flash freq: 40m
Flash mode: DIO

ESP32 extended image header
===========================
WP pin: 0xee
Flash pins drive settings: clk_drv: 0x0, q_drv: 0x0, d_drv: 0x0, cs0_drv: 0x0, hd_drv: 0x0, wp_drv: 0x0
Chip ID: 0
Minimal chip revision: v0.0, (legacy min_rev = 0)
Maximal chip revision: v3.99

Segments information
====================
Segment   Length   Load addr   File offs  Memory types
-------  -------  ----------  ----------  ------------
    1  0x01bb0  0x3fff0030  0x00000018  BYTE_ACCESSIBLE, DRAM, DIRAM_DRAM
    2  0x03c90  0x40078000  0x00001bd0  CACHE_APP
    3  0x00004  0x40080400  0x00005868  IRAM
    4  0x00f2c  0x40080404  0x00005874  IRAM

ESP32 image footer
==================
Checksum: 0x65 (valid)
Validation hash: 6f31a7f8512f26f6bce7c3b270f93bf6cf1ee4602c322998ca8ce27433527e92 (valid)

Bootloader information
======================
Bootloader version: 1
ESP-IDF: v5.1-dev-4304-gcb51a3b-dirty
Compile time: Mar 30 2023 19:14:17

引导加载程序描述

引导加载程序二进制文件的 DRAM0 段起始位置为 esp_bootloader_desc_t 结构体，其中包含描述引导加载程序的特定字段。此结构体位置具有固定偏移量，大小为 sizeof(esp_image_header_t) + sizeof(esp_image_segment_header_t)。

magic_byte：esp_bootloader_desc 结构体的魔术字节

reserved：保留供 IDF 未来使用

version：引导加载程序版本，参见 CONFIG_BOOTLOADER_PROJECT_VER

idf_ver：IDF 版本。1

date 和 time：编译日期和时间

reserved2：保留供 IDF 未来使用

1: 最大长度为 32 个字符，包括空终止符。

如需从正在运行的引导加载程序中获取 esp_bootloader_desc_t 结构体，请使用 esp_bootloader_get_description()。

如需从正在运行的应用程序中获取 esp_bootloader_desc_t 结构体，请使用 esp_ota_get_bootloader_description()。

API参考

Header File

components/esp_bootloader_format/include/esp_bootloader_desc.h
This header file can be included with:
#include "esp_bootloader_desc.h"
This header file is a part of the API provided by the esp_bootloader_format component. To declare that your component depends on esp_bootloader_format, add the following to your CMakeLists.txt:
REQUIRES esp_bootloader_format
or
PRIV_REQUIRES esp_bootloader_format

Functions

const esp_bootloader_desc_t *esp_bootloader_get_description(void)

Return esp_bootloader_desc structure.

Intended for use by the bootloader.

返回: Pointer to esp_bootloader_desc structure.

Structures

struct esp_bootloader_desc_t

Bootloader description structure.

Public Members

uint8_t magic_byte: Magic byte ESP_BOOTLOADER_DESC_MAGIC_BYTE

uint8_t reserved[3]: reserved for IDF

uint32_t version: Bootloader version

char idf_ver[32]: Version IDF

char date_time[24]: Compile date and time

uint8_t reserved2[16]: reserved for IDF

Macros

ESP_BOOTLOADER_DESC_MAGIC_BYTE: The magic byte for the esp_bootloader_desc structure that is in DRAM.

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