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 esp32 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 onesp_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[2]
reserved for IDF
-
uint8_t secure_version
The version used by bootloader anti-rollback feature
-
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
-
uint8_t magic_byte
Macros
-
ESP_BOOTLOADER_DESC_MAGIC_BYTE
The magic byte for the esp_bootloader_desc structure that is in DRAM.