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https://github.com/espressif/esp-idf.git
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5f2d918437
Change the default bootloader config to -Os to save size. This is a useful feature because it allows switching between debug and release configs in the app without also needing to account for a size change in the bootloader.
356 lines
15 KiB
Plaintext
356 lines
15 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see kconfig/kconfig-language.txt.
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#
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mainmenu "Espressif IoT Development Framework Configuration"
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config IDF_CMAKE
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bool
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option env="IDF_CMAKE"
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config IDF_ENV_FPGA
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# This option is for internal use only
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bool
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config IDF_TARGET
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# This option records the IDF target when sdkconfig is generated the first time.
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# It is not updated if environment variable $IDF_TARGET changes later, and
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# the build system is responsible for detecting the mismatch between
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# CONFIG_IDF_TARGET and $IDF_TARGET.
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string
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default "$IDF_TARGET"
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config IDF_TARGET_ESP32
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bool
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default "y" if IDF_TARGET="esp32"
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config IDF_TARGET_ESP32S2BETA
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bool
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default "y" if IDF_TARGET="esp32s2beta"
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select FREERTOS_UNICORE
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config IDF_FIRMWARE_CHIP_ID
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hex
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default 0x0000 if IDF_TARGET_ESP32
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# note: S2 beta uses Chip ID 0 still, S2 will use 0x0002
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default 0x0000 if IDF_TARGET_ESP32S2BETA
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default 0xFFFF
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menu "SDK tool configuration"
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config SDK_TOOLPREFIX
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string "Compiler toolchain path/prefix"
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default "xtensa-esp32-elf-" if IDF_TARGET_ESP32
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default "xtensa-esp32s2-elf-" if IDF_TARGET_ESP32S2BETA
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help
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The prefix/path that is used to call the toolchain. The default setting assumes
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a crosstool-ng gcc setup that is in your PATH.
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config SDK_PYTHON
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string "Python interpreter"
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depends on !IDF_CMAKE
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default "python"
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help
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The executable name/path that is used to run python.
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(Note: This option is used with the legacy GNU Make build system only.)
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config SDK_MAKE_WARN_UNDEFINED_VARIABLES
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bool "'make' warns on undefined variables"
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depends on !IDF_CMAKE
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default "y"
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help
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Adds --warn-undefined-variables to MAKEFLAGS. This causes make to
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print a warning any time an undefined variable is referenced.
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This option helps find places where a variable reference is misspelled
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or otherwise missing, but it can be unwanted if you have Makefiles which
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depend on undefined variables expanding to an empty string.
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(Note: this option is used with the legacy GNU Make build system only.)
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config SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS
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bool "Toolchain supports time_t wide 64-bits"
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default n
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help
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Enable this option in case you have a custom toolchain which supports time_t wide 64-bits.
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This option checks time_t is 64-bits and disables ROM time functions
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to use the time functions from the toolchain instead.
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This option allows resolving the Y2K38 problem.
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See "Setup Linux Toolchain from Scratch" to build
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a custom toolchain which supports 64-bits time_t.
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Note: ESP-IDF does not currently come with any pre-compiled toolchain
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that supports 64-bit wide time_t.
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This will change in a future major release,
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but currently 64-bit time_t requires a custom built toolchain.
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endmenu # SDK tool configuration
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menu "Build type"
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choice APP_BUILD_TYPE
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prompt "Application build type"
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default APP_BUILD_TYPE_APP_2NDBOOT
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help
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Select the way the application is built.
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By default, the application is built as a binary file in a format compatible with
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the ESP32 bootloader. In addition to this application, 2nd stage bootloader is
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also built. Application and bootloader binaries can be written into flash and
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loaded/executed from there.
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Another option, useful for only very small and limited applications, is to only link
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the .elf file of the application, such that it can be loaded directly into RAM over
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JTAG. Note that since IRAM and DRAM sizes are very limited, it is not possible to
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build any complex application this way. However for kinds of testing and debugging,
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this option may provide faster iterations, since the application does not need to be
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written into flash.
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Note that at the moment, ESP-IDF does not contain all the startup code required to
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initialize the CPUs and ROM memory (data/bss). Therefore it is necessary to execute
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a bit of ROM code prior to executing the application. A gdbinit file may look as follows:
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# Connect to a running instance of OpenOCD
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target remote :3333
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# Reset and halt the target
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mon reset halt
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# Run to a specific point in ROM code,
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# where most of initialization is complete.
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thb *0x40007901
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c
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# Load the application into RAM
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load
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# Run till app_main
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tb app_main
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c
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Execute this gdbinit file as follows:
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xtensa-esp32-elf-gdb build/app-name.elf -x gdbinit
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Recommended sdkconfig.defaults for building loadable ELF files is as follows.
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CONFIG_APP_BUILD_TYPE_ELF_RAM is required, other options help reduce application
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memory footprint.
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CONFIG_APP_BUILD_TYPE_ELF_RAM=y
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CONFIG_VFS_SUPPORT_TERMIOS=
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CONFIG_NEWLIB_NANO_FORMAT=y
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CONFIG_ESP32_PANIC_PRINT_HALT=y
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CONFIG_ESP32_DEBUG_STUBS_ENABLE=
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CONFIG_ESP_ERR_TO_NAME_LOOKUP=
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config APP_BUILD_TYPE_APP_2NDBOOT
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bool
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prompt "Default (binary application + 2nd stage bootloader)"
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select APP_BUILD_GENERATE_BINARIES
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select APP_BUILD_BOOTLOADER
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select APP_BUILD_USE_FLASH_SECTIONS
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config APP_BUILD_TYPE_ELF_RAM
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bool
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prompt "ELF file, loadable into RAM (EXPERIMENTAL))"
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endchoice # APP_BUILD_TYPE
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# Hidden options, set according to the choice above
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config APP_BUILD_GENERATE_BINARIES
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bool # Whether to generate .bin files or not
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config APP_BUILD_BOOTLOADER
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bool # Whether to build the bootloader
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config APP_BUILD_USE_FLASH_SECTIONS
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bool # Whether to place code/data into memory-mapped flash sections
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endmenu # Build type
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source "$COMPONENT_KCONFIGS_PROJBUILD_SOURCE_FILE"
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menu "Compiler options"
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choice COMPILER_OPTIMIZATION
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prompt "Optimization Level"
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default COMPILER_OPTIMIZATION_DEFAULT
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help
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This option sets compiler optimization level (gcc -O argument) for the app.
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- The "Default" setting will add the -0g flag to CFLAGS.
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- The "Size" setting will add the -0s flag to CFLAGS.
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- The "Performance" setting will add the -O2 flag to CFLAGS.
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- The "None" setting will add the -O0 flag to CFLAGS.
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The "Size" setting cause the compiled code to be smaller and faster, but
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may lead to difficulties of correlating code addresses to source file
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lines when debugging.
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The "Performance" setting causes the compiled code to be larger and faster,
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but will be easier to correlated code addresses to source file lines.
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"None" with -O0 produces compiled code without optimization.
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Note that custom optimization levels may be unsupported.
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Compiler optimization for the IDF bootloader is set separately,
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see the BOOTLOADER_COMPILER_OPTIMIZATION setting.
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config COMPILER_OPTIMIZATION_DEFAULT
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bool "Debug (-Og)"
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config COMPILER_OPTIMIZATION_SIZE
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bool "Optimize for size (-Os)"
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config COMPILER_OPTIMIZATION_PERF
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bool "Optimize for performance (-O2)"
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config COMPILER_OPTIMIZATION_NONE
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bool "Debug without optimization (-O0)"
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endchoice
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choice COMPILER_OPTIMIZATION_ASSERTION_LEVEL
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prompt "Assertion level"
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default COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
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help
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Assertions can be:
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- Enabled. Failure will print verbose assertion details. This is the default.
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- Set to "silent" to save code size (failed assertions will abort() but user
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needs to use the aborting address to find the line number with the failed assertion.)
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- Disabled entirely (not recommended for most configurations.) -DNDEBUG is added
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to CPPFLAGS in this case.
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config COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE
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prompt "Enabled"
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bool
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help
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Enable assertions. Assertion content and line number will be printed on failure.
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config COMPILER_OPTIMIZATION_ASSERTIONS_SILENT
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prompt "Silent (saves code size)"
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bool
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help
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Enable silent assertions. Failed assertions will abort(), user needs to
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use the aborting address to find the line number with the failed assertion.
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config COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE
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prompt "Disabled (sets -DNDEBUG)"
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bool
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help
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If assertions are disabled, -DNDEBUG is added to CPPFLAGS.
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endchoice # assertions
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menuconfig COMPILER_CXX_EXCEPTIONS
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bool "Enable C++ exceptions"
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default n
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help
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Enabling this option compiles all IDF C++ files with exception support enabled.
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Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code
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which throws an exception will abort instead.
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Enabling this option currently adds an additional ~500 bytes of heap overhead
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when an exception is thrown in user code for the first time.
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config COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE
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int "Emergency Pool Size"
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default 0
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depends on COMPILER_CXX_EXCEPTIONS
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help
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Size (in bytes) of the emergency memory pool for C++ exceptions. This pool will be used to allocate
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memory for thrown exceptions when there is not enough memory on the heap.
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config COMPILER_CXX_RTTI
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bool "Enable C++ run-time type info (RTTI)"
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default n
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help
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Enabling this option compiles all C++ files with RTTI support enabled.
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This increases binary size (typically by tens of kB) but allows using
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dynamic_cast conversion and typeid operator.
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choice COMPILER_STACK_CHECK_MODE
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prompt "Stack smashing protection mode"
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default COMPILER_STACK_CHECK_MODE_NONE
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help
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Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack
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smashing attacks. This is done by adding a guard variable to functions with vulnerable objects.
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The guards are initialized when a function is entered and then checked when the function exits.
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If a guard check fails, program is halted. Protection has the following modes:
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- In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with
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buffers larger than 8 bytes are protected.
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- STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions
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to be protected -- those that have local array definitions, or have references to local frame
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addresses.
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- In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected.
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Modes have the following impact on code performance and coverage:
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- performance: NORMAL > STRONG > OVERALL
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- coverage: NORMAL < STRONG < OVERALL
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config COMPILER_STACK_CHECK_MODE_NONE
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bool "None"
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config COMPILER_STACK_CHECK_MODE_NORM
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bool "Normal"
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config COMPILER_STACK_CHECK_MODE_STRONG
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bool "Strong"
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config COMPILER_STACK_CHECK_MODE_ALL
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bool "Overall"
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endchoice
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config COMPILER_STACK_CHECK
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bool
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default !COMPILER_STACK_CHECK_MODE_NONE
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help
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Stack smashing protection.
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config COMPILER_WARN_WRITE_STRINGS
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bool "Enable -Wwrite-strings warning flag"
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default "n"
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help
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Adds -Wwrite-strings flag for the C/C++ compilers.
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For C, this gives string constants the type ``const char[]`` so that
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copying the address of one into a non-const ``char *`` pointer
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produces a warning. This warning helps to find at compile time code
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that tries to write into a string constant.
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For C++, this warns about the deprecated conversion from string
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literals to ``char *``.
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config COMPILER_DISABLE_GCC8_WARNINGS
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bool "Disable new warnings introduced in GCC 6 - 8"
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default "n"
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help
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Enable this option if using GCC 6 or newer, and wanting to disable warnings which don't appear with
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GCC 5.
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endmenu # Compiler Options
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menu "Component config"
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source "$COMPONENT_KCONFIGS_SOURCE_FILE"
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endmenu
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menu "Compatibility options"
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config LEGACY_INCLUDE_COMMON_HEADERS
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bool "Include headers across components as before IDF v4.0"
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default n
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help
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Soc, esp32, and driver components, the most common
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components. Some header of these components are included
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implicitly by headers of other components before IDF v4.0.
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It's not required for high-level components, but still
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included through long header chain everywhere.
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This is harmful to the modularity. So it's changed in IDF
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v4.0.
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You can still include these headers in a legacy way until it
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is totally deprecated by enable this option.
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endmenu #Compatibility options
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