2023-09-26 03:47:19 -04:00
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引导加载程序镜像的格式
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=======================
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:link_to_translation:`en:[English]`
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引导加载程序镜像与应用程序镜像具有相同的结构，参见 :ref:`app-image-structures`。二者唯一的区别在于 :ref:`描述引导加载程序的结构体 <image-format-bootloader-description>` 不同。
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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：
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.. code-block::
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esptool.py --chip {IDF_TARGET_PATH_NAME} image_info build/bootloader/bootloader.bin --version 2
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输出结果如下形式所示：
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.. code-block::
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File size: 26576 (bytes)
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ESP32 image header
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==================
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Image version: 1
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Entry point: 0x40080658
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Segments: 4
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Flash size: 2MB
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Flash freq: 40m
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Flash mode: DIO
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ESP32 extended image header
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===========================
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WP pin: 0xee
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Flash pins drive settings: clk_drv: 0x0, q_drv: 0x0, d_drv: 0x0, cs0_drv: 0x0, hd_drv: 0x0, wp_drv: 0x0
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Chip ID: 0
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Minimal chip revision: v0.0, (legacy min_rev = 0)
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Maximal chip revision: v3.99
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Segments information
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====================
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Segment Length Load addr File offs Memory types
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------- ------- ---------- ---------- ------------
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1 0x01bb0 0x3fff0030 0x00000018 BYTE_ACCESSIBLE, DRAM, DIRAM_DRAM
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2 0x03c90 0x40078000 0x00001bd0 CACHE_APP
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3 0x00004 0x40080400 0x00005868 IRAM
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4 0x00f2c 0x40080404 0x00005874 IRAM
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ESP32 image footer
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==================
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Checksum: 0x65 (valid)
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Validation hash: 6f31a7f8512f26f6bce7c3b270f93bf6cf1ee4602c322998ca8ce27433527e92 (valid)
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Bootloader information
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======================
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Bootloader version: 1
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ESP-IDF: v5.1-dev-4304-gcb51a3b-dirty
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Compile time: Mar 30 2023 19:14:17
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.. _image-format-bootloader-description:
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引导加载程序描述
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----------------------
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引导加载程序二进制文件的 ``DRAM0`` 段起始位置为 :cpp:type:`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(:cpp:type:`esp_image_header_t`) + sizeof(:cpp:type:`esp_image_segment_header_t`)。
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* ``magic_byte``：esp_bootloader_desc 结构体的魔术字节
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* ``reserved``：保留供 IDF 未来使用
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* ``version``：引导加载程序版本，参见 :ref:`CONFIG_BOOTLOADER_PROJECT_VER`
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* ``idf_ver``：IDF 版本。[#f1]_
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* ``date`` 和 ``time``：编译日期和时间
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* ``reserved2``：保留供 IDF 未来使用
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.. [#f1] 最大长度为 32 个字符，包括空终止符。
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如需从正在运行的引导加载程序中获取 :cpp:type:`esp_bootloader_desc_t` 结构体，请使用 :cpp:func:`esp_bootloader_get_description`。
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如需从正在运行的应用程序中获取 :cpp:type:`esp_bootloader_desc_t` 结构体，请使用 :cpp:func:`esp_ota_get_bootloader_description`。
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API参考
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-------------
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.. include-build-file:: inc/esp_bootloader_desc.inc
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