esp-idf/components/app_update/Kconfig.projbuild

menu "Application manager"

    config APP_COMPILE_TIME_DATE
        bool "Use time/date stamp for app"
        default y
        help
            If set, then the app will be built with the current time/date stamp. It is stored in the app description
            structure. If not set, time/date stamp will be excluded from app image. This can be useful for getting the
            same binary image files made from the same source, but at different times.

    config APP_EXCLUDE_PROJECT_VER_VAR
        bool "Exclude PROJECT_VER from firmware image"
        default n
        help
            The PROJECT_VER variable from the build system will not affect the firmware image.
            This value will not be contained in the esp_app_desc structure.

    config APP_EXCLUDE_PROJECT_NAME_VAR
        bool "Exclude PROJECT_NAME from firmware image"
        default n
        help
            The PROJECT_NAME variable from the build system will not affect the firmware image.
            This value will not be contained in the esp_app_desc structure.

    config APP_RETRIEVE_LEN_ELF_SHA
        int "The length of APP ELF SHA is stored in RAM(chars)"
        default 16
        range 8 64
        help
            At startup, the app will read this many hex characters from the embedded APP ELF SHA-256 hash value
            and store it in static RAM. This ensures the app ELF SHA-256 value is always available
            if it needs to be printed by the panic handler code.
            Changing this value will change the size of a static buffer, in bytes.

endmenu # "Application manager"