esp-idf/Kconfig

#
# Please run the following command for opening a page with more information about this configuration file:
# idf.py docs -sp api-reference/kconfig.html
#
mainmenu "Espressif IoT Development Framework Configuration"

    orsource "./components/soc/$IDF_TARGET/include/soc/Kconfig.soc_caps.in"

    config IDF_CMAKE
        bool
        default "y"

    config IDF_ENV_FPGA
        # This option is for internal use only
        bool
        option env="IDF_ENV_FPGA"

    config IDF_CI_BUILD
        bool
        default y if "$(IDF_CI_BUILD)" = "y" || "$(IDF_CI_BUILD)" = 1

    config IDF_TARGET_ARCH_RISCV
        bool
        default "n"

    config IDF_TARGET_ARCH_XTENSA
        bool
        default "n"

    config IDF_TARGET_ARCH
        string
        default "riscv" if IDF_TARGET_ARCH_RISCV
        default "xtensa" if IDF_TARGET_ARCH_XTENSA

    config IDF_TARGET
        # This option records the IDF target when sdkconfig is generated the first time.
        # It is not updated if environment variable $IDF_TARGET changes later, and
        # the build system is responsible for detecting the mismatch between
        # CONFIG_IDF_TARGET and $IDF_TARGET.
        string
        default "$IDF_TARGET"

    config IDF_TARGET_LINUX
        bool
        default "y" if IDF_TARGET="linux"

    config IDF_TARGET_ESP32
        bool
        default "y" if IDF_TARGET="esp32"
        select IDF_TARGET_ARCH_XTENSA

    config IDF_TARGET_ESP32S2
        bool
        default "y" if IDF_TARGET="esp32s2"
        select FREERTOS_UNICORE
        select IDF_TARGET_ARCH_XTENSA

    config IDF_TARGET_ESP32S3
        bool
        default "y" if IDF_TARGET="esp32s3"
        select IDF_TARGET_ARCH_XTENSA

    config IDF_TARGET_ESP32C3
        bool
        default "y" if IDF_TARGET="esp32c3"
        select FREERTOS_UNICORE
        select IDF_TARGET_ARCH_RISCV

    config IDF_TARGET_ESP32H4
        bool
        default "y" if IDF_TARGET="esp32h4"
        select FREERTOS_UNICORE
        select IDF_TARGET_ARCH_RISCV

    choice IDF_TARGET_ESP32H4_BETA_VERSION
        prompt "ESP32-H4 beta version"
        depends on IDF_TARGET_ESP32H4
        default IDF_TARGET_ESP32H4_BETA_VERSION_2
        help
            Currently ESP32-H4 has several beta versions for internal use only.
            Select the one that matches your chip model.

        config IDF_TARGET_ESP32H4_BETA_VERSION_1
            bool
            prompt "ESP32-H4 beta1"
        config IDF_TARGET_ESP32H4_BETA_VERSION_2
            bool
            prompt "ESP32-H4 beta2"
    endchoice

    config IDF_TARGET_ESP32C2
        bool
        default "y" if IDF_TARGET="esp32c2"
        select FREERTOS_UNICORE
        select IDF_TARGET_ARCH_RISCV

    config IDF_TARGET_ESP32C6
        bool
        default "y" if IDF_TARGET="esp32c6"
        select FREERTOS_UNICORE
        select IDF_TARGET_ARCH_RISCV

    config IDF_TARGET_LINUX
        bool
        default "y" if IDF_TARGET="linux"

    config IDF_FIRMWARE_CHIP_ID
        hex
        default 0x0000 if IDF_TARGET_ESP32
        default 0x0002 if IDF_TARGET_ESP32S2
        default 0x0005 if IDF_TARGET_ESP32C3
        default 0x0009 if IDF_TARGET_ESP32S3
        default 0x000A if IDF_TARGET_ESP32H4_BETA_VERSION_1
        default 0x000C if IDF_TARGET_ESP32C2
        default 0x000D if IDF_TARGET_ESP32C6
        default 0x000E if IDF_TARGET_ESP32H4_BETA_VERSION_2 # ESP32-TODO: IDF-3475
        default 0xFFFF


    menu "Build type"

        choice APP_BUILD_TYPE
            prompt "Application build type"
            default APP_BUILD_TYPE_APP_2NDBOOT
            help
                Select the way the application is built.

                By default, the application is built as a binary file in a format compatible with
                the ESP-IDF bootloader. In addition to this application, 2nd stage bootloader is
                also built. Application and bootloader binaries can be written into flash and
                loaded/executed from there.

                Another option, useful for only very small and limited applications, is to only link
                the .elf file of the application, such that it can be loaded directly into RAM over
                JTAG. Note that since IRAM and DRAM sizes are very limited, it is not possible to
                build any complex application this way. However for kinds of testing and debugging,
                this option may provide faster iterations, since the application does not need to be
                written into flash.
                Note that at the moment, ESP-IDF does not contain all the startup code required to
                initialize the CPUs and ROM memory (data/bss). Therefore it is necessary to execute
                a bit of ROM code prior to executing the application. A gdbinit file may look as follows (for ESP32):

                    # Connect to a running instance of OpenOCD
                    target remote :3333
                    # Reset and halt the target
                    mon reset halt
                    # Run to a specific point in ROM code,
                    #  where most of initialization is complete.
                    thb *0x40007d54
                    c
                    # Load the application into RAM
                    load
                    # Run till app_main
                    tb app_main
                    c

                Execute this gdbinit file as follows:

                    xtensa-esp32-elf-gdb build/app-name.elf -x gdbinit

                Example gdbinit files for other targets can be found in tools/test_apps/system/gdb_loadable_elf/

                Recommended sdkconfig.defaults for building loadable ELF files is as follows.
                CONFIG_APP_BUILD_TYPE_ELF_RAM is required, other options help reduce application
                memory footprint.

                    CONFIG_APP_BUILD_TYPE_ELF_RAM=y
                    CONFIG_VFS_SUPPORT_TERMIOS=
                    CONFIG_NEWLIB_NANO_FORMAT=y
                    CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y
                    CONFIG_ESP_DEBUG_STUBS_ENABLE=
                    CONFIG_ESP_ERR_TO_NAME_LOOKUP=


            config APP_BUILD_TYPE_APP_2NDBOOT
                bool
                prompt "Default (binary application + 2nd stage bootloader)"
                depends on !IDF_TARGET_LINUX
                select APP_BUILD_GENERATE_BINARIES
                select APP_BUILD_BOOTLOADER
                select APP_BUILD_USE_FLASH_SECTIONS

            config APP_BUILD_TYPE_ELF_RAM
                bool
                prompt "ELF file, loadable into RAM (EXPERIMENTAL))"
        endchoice # APP_BUILD_TYPE

        # Hidden options, set according to the choice above
        config APP_BUILD_GENERATE_BINARIES
            bool # Whether to generate .bin files or not

        config APP_BUILD_BOOTLOADER
            bool # Whether to build the bootloader

        config APP_BUILD_USE_FLASH_SECTIONS
            bool # Whether to place code/data into memory-mapped flash sections

        config APP_REPRODUCIBLE_BUILD
            bool "Enable reproducible build"
            default n
            select COMPILER_HIDE_PATHS_MACROS
            help
                If enabled, all date, time, and path information would be eliminated. A .gdbinit file would be create
                automatically. (or will be append if you have one already)

        config APP_NO_BLOBS
            bool "No Binary Blobs"
            default n
            help
                If enabled, this disables the linking of binary libraries in the application build. Note
                that after enabling this Wi-Fi/Bluetooth will not work.

        config APP_COMPATIBLE_PRE_V2_1_BOOTLOADERS
            bool "App compatible with bootloaders before ESP-IDF v2.1"
            select APP_COMPATIBLE_PRE_V3_1_BOOTLOADERS
            depends on IDF_TARGET_ESP32
            default n
            help
                Bootloaders before ESP-IDF v2.1 did less initialisation of the
                system clock. This setting needs to be enabled to build an app
                which can be booted by these older bootloaders.

                If this setting is enabled, the app can be booted by any bootloader
                from IDF v1.0 up to the current version.

                If this setting is disabled, the app can only be booted by bootloaders
                from IDF v2.1 or newer.

                Enabling this setting adds approximately 1KB to the app's IRAM usage.

        config APP_COMPATIBLE_PRE_V3_1_BOOTLOADERS
            bool "App compatible with bootloader and partition table before ESP-IDF v3.1"
            depends on IDF_TARGET_ESP32
            default n
            help
                Partition tables before ESP-IDF V3.1 do not contain an MD5 checksum
                field, and the bootloader before ESP-IDF v3.1 cannot read a partition
                table that contains an MD5 checksum field.

                Enable this option only if your app needs to boot on a bootloader and/or
                partition table that was generated from a version *before* ESP-IDF v3.1.

                If this option and Flash Encryption are enabled at the same time, and any
                data partitions in the partition table are marked Encrypted, then the
                partition encrypted flag should be manually verified in the app before accessing
                the partition (see CVE-2021-27926).

        config APP_INIT_CLK
            bool
            depends on IDF_TARGET_ESP32
            default y if APP_COMPATIBLE_PRE_V2_1_BOOTLOADERS
            default y if APP_BUILD_TYPE_ELF_RAM


    endmenu # Build type

    source "$COMPONENT_KCONFIGS_PROJBUILD_SOURCE_FILE"

    menu "Compiler options"

        choice COMPILER_OPTIMIZATION
            prompt "Optimization Level"
            default COMPILER_OPTIMIZATION_DEFAULT
            help
                This option sets compiler optimization level (gcc -O argument) for the app.

                - The "Default" setting will add the -0g flag to CFLAGS.
                - The "Size" setting will add the -0s flag to CFLAGS.
                - The "Performance" setting will add the -O2 flag to CFLAGS.
                - The "None" setting will add the -O0 flag to CFLAGS.

                The "Size" setting cause the compiled code to be smaller and faster, but
                may lead to difficulties of correlating code addresses to source file
                lines when debugging.

                The "Performance" setting causes the compiled code to be larger and faster,
                but will be easier to correlated code addresses to source file lines.

                "None" with -O0 produces compiled code without optimization.

                Note that custom optimization levels may be unsupported.

                Compiler optimization for the IDF bootloader is set separately,
                see the BOOTLOADER_COMPILER_OPTIMIZATION setting.

            config COMPILER_OPTIMIZATION_DEFAULT
                bool "Debug (-Og)"
            config COMPILER_OPTIMIZATION_SIZE
                bool "Optimize for size (-Os)"
            config COMPILER_OPTIMIZATION_PERF
                bool "Optimize for performance (-O2)"
            config COMPILER_OPTIMIZATION_NONE
                bool "Debug without optimization (-O0)"

        endchoice

        choice COMPILER_OPTIMIZATION_ASSERTION_LEVEL
            prompt "Assertion level"
            default COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
            help
                Assertions can be:

                - Enabled. Failure will print verbose assertion details. This is the default.

                - Set to "silent" to save code size (failed assertions will abort() but user
                  needs to use the aborting address to find the line number with the failed assertion.)

                - Disabled entirely (not recommended for most configurations.) -DNDEBUG is added
                  to CPPFLAGS in this case.

            config COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
                prompt "Enabled"
                bool
                help
                    Enable assertions. Assertion content and line number will be printed on failure.

            config COMPILER_OPTIMIZATION_ASSERTIONS_SILENT
                prompt "Silent (saves code size)"
                bool
                help
                    Enable silent assertions. Failed assertions will abort(), user needs to
                    use the aborting address to find the line number with the failed assertion.

            config COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE
                prompt "Disabled (sets -DNDEBUG)"
                bool
                help
                    If assertions are disabled, -DNDEBUG is added to CPPFLAGS.

        endchoice # assertions

        choice COMPILER_FLOAT_LIB_FROM
            prompt "Compiler float lib source"
            default COMPILER_FLOAT_LIB_FROM_RVFPLIB if ESP_ROM_HAS_RVFPLIB
            default COMPILER_FLOAT_LIB_FROM_GCCLIB
            help
                In the soft-fp part of libgcc, riscv version is written in C,
                and handles all edge cases in IEEE754, which makes it larger
                and performance is slow.

                RVfplib is an optimized RISC-V library for FP arithmetic on 32-bit
                integer processors, for single and double-precision FP.
                RVfplib is "fast", but it has a few exceptions from IEEE 754 compliance.

            config COMPILER_FLOAT_LIB_FROM_GCCLIB
                bool "libgcc"
            config COMPILER_FLOAT_LIB_FROM_RVFPLIB
                depends on ESP_ROM_HAS_RVFPLIB
                bool "librvfp"
        endchoice # COMPILER_FLOAT_LIB_FROM

        config COMPILER_OPTIMIZATION_ASSERTION_LEVEL
            int
            default 0 if COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE
            default 1 if COMPILER_OPTIMIZATION_ASSERTIONS_SILENT
            default 2 if COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE

        config COMPILER_OPTIMIZATION_CHECKS_SILENT
            bool "Disable messages in ESP_RETURN_ON_* and ESP_EXIT_ON_* macros"
            default n
            help
                If enabled, the error messages will be discarded in following check macros:
                - ESP_RETURN_ON_ERROR
                - ESP_EXIT_ON_ERROR
                - ESP_RETURN_ON_FALSE
                - ESP_EXIT_ON_FALSE

        menuconfig COMPILER_HIDE_PATHS_MACROS
            bool "Replace ESP-IDF and project paths in binaries"
            default y
            help
                When expanding the __FILE__ and __BASE_FILE__ macros, replace paths inside ESP-IDF
                with paths relative to the placeholder string "IDF", and convert paths inside the
                project directory to relative paths.

                This allows building the project with assertions or other code that embeds file paths,
                without the binary containing the exact path to the IDF or project directories.

                This option passes -fmacro-prefix-map options to the GCC command line. To replace additional
                paths in your binaries, modify the project CMakeLists.txt file to pass custom -fmacro-prefix-map or
                -ffile-prefix-map arguments.

        menuconfig COMPILER_CXX_EXCEPTIONS
            bool "Enable C++ exceptions"
            default n
            help
                Enabling this option compiles all IDF C++ files with exception support enabled.

                Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code
                which throws an exception will abort instead.

                Enabling this option currently adds an additional ~500 bytes of heap overhead
                when an exception is thrown in user code for the first time.

        config COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE
            int "Emergency Pool Size"
            default 0
            depends on COMPILER_CXX_EXCEPTIONS
            help
                Size (in bytes) of the emergency memory pool for C++ exceptions. This pool will be used to allocate
                memory for thrown exceptions when there is not enough memory on the heap.

        config COMPILER_CXX_RTTI
            bool "Enable C++ run-time type info (RTTI)"
            default n
            help
                Enabling this option compiles all C++ files with RTTI support enabled.
                This increases binary size (typically by tens of kB) but allows using
                dynamic_cast conversion and typeid operator.

        choice COMPILER_STACK_CHECK_MODE
            prompt "Stack smashing protection mode"
            default COMPILER_STACK_CHECK_MODE_NONE
            help
                Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
                smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
                The guards are initialized when a function is entered and then checked when the function exits.
                If a guard check fails, program is halted. Protection has the following modes:

                - In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with
                  buffers larger than 8 bytes are protected.

                - STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions
                  to be protected -- those that have local array definitions, or have references to local frame
                  addresses.

                - In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.

                Modes have the following impact on code performance and coverage:

                - performance: NORMAL > STRONG > OVERALL

                - coverage: NORMAL < STRONG < OVERALL

                The performance impact includes increasing the amount of stack memory required for each task.

            config COMPILER_STACK_CHECK_MODE_NONE
                bool "None"
            config COMPILER_STACK_CHECK_MODE_NORM
                bool "Normal"
            config COMPILER_STACK_CHECK_MODE_STRONG
                bool "Strong"
            config COMPILER_STACK_CHECK_MODE_ALL
                bool "Overall"
        endchoice

        config COMPILER_STACK_CHECK
            bool
            default !COMPILER_STACK_CHECK_MODE_NONE
            help
                Stack smashing protection.

        config COMPILER_WARN_WRITE_STRINGS
            bool "Enable -Wwrite-strings warning flag"
            default "n"
            help
                Adds -Wwrite-strings flag for the C/C++ compilers.

                For C, this gives string constants the type ``const char[]`` so that
                copying the address of one into a non-const ``char *`` pointer
                produces a warning. This warning helps to find at compile time code
                that tries to write into a string constant.

                For C++, this warns about the deprecated conversion from string
                literals to ``char *``.

        config COMPILER_SAVE_RESTORE_LIBCALLS
            bool "Enable -msave-restore flag to reduce code size"
            depends on IDF_TARGET_ARCH_RISCV
            help
                Adds -msave-restore to C/C++ compilation flags.

                When this flag is enabled, compiler will call library functions to
                save/restore registers in function prologues/epilogues. This results
                in lower overall code size, at the expense of slightly reduced performance.

                This option can be enabled for RISC-V targets only.

        config COMPILER_DUMP_RTL_FILES
            bool "Dump RTL files during compilation"
            help
                If enabled, RTL files will be produced during compilation. These files
                can be used by other tools, for example to calculate call graphs.

    endmenu # Compiler Options

    menu "Component config"
        source "$COMPONENT_KCONFIGS_SOURCE_FILE"
    endmenu