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77 lines
2.8 KiB
ReStructuredText
77 lines
2.8 KiB
ReStructuredText
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Bootloader Image Format
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=======================
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The bootloader image consists of the same structures as the application image, see :ref:`Application Image Structures <app-image-structures>`. The only difference is in the :ref:`Bootloader Description <image-format-bootloader-description>` structure.
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To get information about the bootloader image, please run the following command:
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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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.. 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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Bootloader Description
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----------------------
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The ``DRAM0`` segment of the bootloader binary starts with the :cpp:type:`esp_bootloader_desc_t` structure which carries specific fields describing the bootloader. This structure is located at a fixed offset = sizeof(:cpp:type:`esp_image_header_t`) + sizeof(:cpp:type:`esp_image_segment_header_t`).
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* ``magic_byte`` - the magic byte for the esp_bootloader_desc structure.
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* ``reserved`` - reserved for the future IDF use.
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* ``version`` - bootloader version, see :ref:`CONFIG_BOOTLOADER_PROJECT_VER`
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* ``idf_ver`` - ESP-IDF version. ``*``
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* ``date`` and ``time`` - compile date and time.
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* ``reserved2`` - reserved for the future IDF use.
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``*`` - The maximum length is 32 characters, including null-termination character.
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To get the :cpp:type:`esp_bootloader_desc_t` structure from the running bootloader, use :cpp:func:`esp_bootloader_get_description`.
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To get the :cpp:type:`esp_bootloader_desc_t` structure from a running application, use :cpp:func:`esp_ota_get_bootloader_description`.
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API Reference
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-------------
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.. include-build-file:: inc/esp_bootloader_desc.inc
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