zephyr/Kconfig.zephyr

# General configuration options

# Copyright (c) 2014-2015 Wind River Systems, Inc.
# Copyright (c) 2016 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

menu "Modules"

source "$(CMAKE_BINARY_DIR)/Kconfig.modules"
source "modules/Kconfig"

endmenu

# Include Kconfig.defconfig files first so that they can override defaults and
# other symbol/choice properties by adding extra symbol/choice definitions.
# After merging all definitions for a symbol/choice, Kconfig picks the first
# property (e.g. the first default) with a satisfied condition.
#
# Shield defaults should have precedence over board defaults, which should have
# precedence over SoC defaults, so include them in that order.
#
# $ARCH and $BOARD_DIR will be glob patterns when building documentation.
source "boards/shields/*/Kconfig.defconfig"
source "$(BOARD_DIR)/Kconfig.defconfig"
source "$(SOC_DIR)/$(ARCH)/*/Kconfig.defconfig"

source "boards/Kconfig"
source "$(SOC_DIR)/Kconfig"
source "arch/Kconfig"
source "kernel/Kconfig"
source "dts/Kconfig"
source "drivers/Kconfig"
source "lib/Kconfig"
source "subsys/Kconfig"

osource "$(TOOLCHAIN_KCONFIG_DIR)/Kconfig"

menu "Build and Link Features"

menu "Linker Options"

choice
	prompt "Linker Orphan Section Handling"
	default LINKER_ORPHAN_SECTION_WARN

config LINKER_ORPHAN_SECTION_PLACE
	bool "Place"
	help
	  Linker puts orphan sections in place without warnings
	  or errors.

config LINKER_ORPHAN_SECTION_WARN
	bool "Warn"
	help
	  Linker places the orphan sections in output and issues
	  warning about those sections.

config LINKER_ORPHAN_SECTION_ERROR
	bool "Error"
	help
	  Linker exits with error when an orphan section is found.

endchoice

config CODE_DATA_RELOCATION
	bool "Relocate code/data sections"
	depends on ARM
	help
	  When selected this will relocate .text, data and .bss sections from
	  the specified files and places it in the required memory region. The
	  files should be specified in the CMakeList.txt file with
	  a cmake API zephyr_code_relocate().

config HAS_FLASH_LOAD_OFFSET
	bool
	help
	  This option is selected by targets having a FLASH_LOAD_OFFSET
	  and FLASH_LOAD_SIZE.

if HAS_FLASH_LOAD_OFFSET

config USE_DT_CODE_PARTITION
	bool "Link application into /chosen/zephyr,code-partition from devicetree"
	help
	  When enabled, the application will be linked into the flash partition
	  selected by the zephyr,code-partition property in /chosen in devicetree.
	  When this is disabled, the flash load offset and size can be set manually
	  below.

# Workaround for not being able to have commas in macro arguments
DT_CHOSEN_Z_CODE_PARTITION := zephyr,code-partition

config FLASH_LOAD_OFFSET
	# Only user-configurable when USE_DT_CODE_PARTITION is disabled
	hex "Kernel load offset" if !USE_DT_CODE_PARTITION
	default $(dt_chosen_reg_addr_hex,$(DT_CHOSEN_Z_CODE_PARTITION)) if USE_DT_CODE_PARTITION
	default 0
	help
	  This option specifies the byte offset from the beginning of flash that
	  the kernel should be loaded into. Changing this value from zero will
	  affect the Zephyr image's link, and will decrease the total amount of
	  flash available for use by application code.

	  If unsure, leave at the default value 0.

config FLASH_LOAD_SIZE
	# Only user-configurable when USE_DT_CODE_PARTITION is disabled
	hex "Kernel load size" if !USE_DT_CODE_PARTITION
	default $(dt_chosen_reg_size_hex,$(DT_CHOSEN_Z_CODE_PARTITION)) if USE_DT_CODE_PARTITION
	default 0
	help
	  If non-zero, this option specifies the size, in bytes, of the flash
	  area that the Zephyr image will be allowed to occupy.  If zero, the
	  image will be able to occupy from the FLASH_LOAD_OFFSET to the end of
	  the device.

	  If unsure, leave at the default value 0.

endif # HAS_FLASH_LOAD_OFFSET

config TEXT_SECTION_OFFSET
	hex
	prompt "TEXT section offset" if !BOOTLOADER_MCUBOOT
	default 0x200 if BOOTLOADER_MCUBOOT
	default 0
	help
	  If the application is built for chain-loading by a bootloader this
	  variable is required to be set to value that leaves sufficient
	  space between the beginning of the image and the start of the .text
	  section to store an image header or any other metadata.
	  In the particular case of the MCUboot bootloader this reserves enough
	  space to store the image header, which should also meet vector table
	  alignment requirements on most ARM targets, although some targets
	  may require smaller or larger values.

config HAVE_CUSTOM_LINKER_SCRIPT
	bool "Custom linker scripts provided"
	help
	  Set this option if you have a custom linker script which needed to
	  be define in CUSTOM_LINKER_SCRIPT.

config CUSTOM_LINKER_SCRIPT
	string "Path to custom linker script"
	depends on HAVE_CUSTOM_LINKER_SCRIPT
	help
	  Path to the linker script to be used instead of the one define by the
	  board.

	  The linker script must be based on a version provided by Zephyr since
	  the kernel can expect a certain layout/certain regions.

	  This is useful when an application needs to add sections into the
	  linker script and avoid having to change the script provided by
	  Zephyr.

config CUSTOM_RODATA_LD
	bool "(DEPRECATED) Include custom-rodata.ld"
	help
	  Note: This is deprecated, use Cmake function zephyr_linker_sources() instead.
	  Include a customized linker script fragment for inserting additional
	  data and linker directives into the rodata section.

config CUSTOM_RWDATA_LD
	bool "(DEPRECATED) Include custom-rwdata.ld"
	help
	  Note: This is deprecated, use Cmake function zephyr_linker_sources() instead.
	  Include a customized linker script fragment for inserting additional
	  data and linker directives into the data section.

config CUSTOM_SECTIONS_LD
	bool "(DEPRECATED) Include custom-sections.ld"
	help
	  Note: This is deprecated, use Cmake function zephyr_linker_sources() instead.
	  Include a customized linker script fragment for inserting additional
	  arbitrary sections.

config KERNEL_ENTRY
	string "Kernel entry symbol"
	default "__start"
	help
	  Code entry symbol, to be set at linking phase.

config LINKER_SORT_BY_ALIGNMENT
	bool "Sort input sections by alignment"
	default y
	help
	  This turns on the linker flag to sort sections by alignment
	  in decreasing size of symbols. This helps to minimize
	  padding between symbols.

endmenu

menu "Compiler Options"

config NATIVE_APPLICATION
	bool "Build as a native host application"
	help
	  Build as a native application that can run on the host and using
	  resources and libraries provided by the host.

choice
	prompt "Optimization level"
	default NO_OPTIMIZATIONS    if COVERAGE
	default DEBUG_OPTIMIZATIONS if DEBUG
	default SIZE_OPTIMIZATIONS
	help
	  Note that these flags shall only control the compiler
	  optimization level, and that no extra debug code shall be
	  conditionally compiled based on them.

config SIZE_OPTIMIZATIONS
	bool "Optimize for size"
	help
	  Compiler optimizations will be set to -Os independently of other
	  options.

config SPEED_OPTIMIZATIONS
	bool "Optimize for speed"
	help
	  Compiler optimizations will be set to -O2 independently of other
	  options.

config DEBUG_OPTIMIZATIONS
	bool "Optimize debugging experience"
	help
	  Compiler optimizations will be set to -Og independently of other
	  options.

config NO_OPTIMIZATIONS
	bool "Optimize nothing"
	help
	  Compiler optimizations will be set to -O0 independently of other
	  options.

endchoice

config COMPILER_OPT
	string "Custom compiler options"
	help
	  This option is a free-form string that is passed to the compiler
	  when building all parts of a project (i.e. kernel).
	  The compiler options specified by this string supplement the
	  predefined set of compiler supplied by the build system,
	  and can be used to change compiler optimization, warning and error
	  messages, and so on.

endmenu

choice
	prompt "Error checking behavior for CHECK macro"
	default RUNTIME_ERROR_CHECKS

config ASSERT_ON_ERRORS
	bool "Assert on all errors"
	help
	  Assert on errors covered with the CHECK macro.

config NO_RUNTIME_CHECKS
	bool "No runtime error checks"
	help
	  Do not do any runtime checks or asserts when using the CHECK macro.

config RUNTIME_ERROR_CHECKS
	bool "Enable runtime error checks"
	help
	  Always perform runtime checks covered with the CHECK macro. This
	  option is the default and the only option used during testing.

endchoice

menu "Build Options"

config KERNEL_BIN_NAME
	string "The kernel binary name"
	default "zephyr"
	help
	  This option sets the name of the generated kernel binary.

config OUTPUT_STAT
	bool "Create a statistics file"
	default y
	help
	  Create a stat file using readelf -e <elf>

config OUTPUT_DISASSEMBLY
	bool "Create a disassembly file"
	default y
	help
	  Create an .lst file with the assembly listing of the firmware.

config OUTPUT_DISASSEMBLE_ALL
	bool "Disassemble all sections with source. Fill zeros."
	default n
	depends on OUTPUT_DISASSEMBLY
	help
	  The .lst file will contain complete disassembly of the firmware
	  not just those expected to contain instructions including zeros

config OUTPUT_PRINT_MEMORY_USAGE
	bool "Print memory usage to stdout"
	default y
	help
	  If the toolchain supports it, this option will pass
	  --print-memory-region to the linker when it is doing it's first
	  linker pass. Note that the memory regions are symbolic concepts
	  defined by the linker scripts and do not necessarily map
	  directly to the real physical address space. Take also note that
	  some platforms do two passes of the linker so the results do not
	  match exactly to the final elf file. See also rom_report,
	  ram_report and
	  https://sourceware.org/binutils/docs/ld/MEMORY.html

config BUILD_OUTPUT_HEX
	bool "Build a binary in HEX format"
	help
	  Build a binary in HEX format. This will build a zephyr.hex file need
	  by some platforms.

config BUILD_OUTPUT_BIN
	bool "Build a binary in BIN format"
	default y
	help
	  Build a binary in BIN format. This will build a zephyr.bin file need
	  by some platforms.

config BUILD_OUTPUT_EXE
	bool "Build a binary in ELF format with .exe extension"
	help
	  Build a binary in ELF format that can run in the host system. This
	  will build a zephyr.exe file.

config BUILD_OUTPUT_S19
	bool "Build a binary in S19 format"
	help
	  Build a binary in S19 format. This will build a zephyr.s19 file need
	  by some platforms.

config BUILD_NO_GAP_FILL
	bool "Don't fill gaps in generated hex/bin/s19 files."

config BUILD_OUTPUT_STRIPPED
	bool "Build a stripped binary"
	help
	  Build a stripped binary. This will build a zephyr.stripped file need
	  by some platforms.

config APPLICATION_DEFINED_SYSCALL
	bool "Scan application folder for any syscall definition"
	help
	  Scan additional folders inside application source folder
	  for application defined syscalls.

config MAKEFILE_EXPORTS
	bool "Generate build metadata files named Makefile.exports"
	help
	  Generates a file with build information that can be read by
	  third party Makefile-based build systems.

config LEGACY_DEVICETREE_MACROS
	bool "Allow use of legacy devicetree macros"
	help
	  Allows use of legacy devicetree macros which were used in
	  Zephyr 2.2 and previous versions, rather than the devicetree.h
	  API introduced during the Zephyr 2.3 development cycle.

config LEGACY_ZEPHYR_INT_TYPES
	bool "Allow the use of the legacy zephyr integer types"
	help
	  Allows the use of the legacy Zephyr integer typedefs defined in
	  Zephyr 2.3 and previous versions.

endmenu
endmenu


menu "Boot Options"

config IS_BOOTLOADER
	bool "Act as a bootloader"
	depends on XIP
	depends on ARM
	help
	  This option indicates that Zephyr will act as a bootloader to execute
	  a separate Zephyr image payload.

config BOOTLOADER_SRAM_SIZE
	int "SRAM reserved for bootloader"
	default 16
	depends on !XIP || IS_BOOTLOADER
	depends on ARM || XTENSA
	help
	  This option specifies the amount of SRAM (measure in kB) reserved for
	  a bootloader image, when either:
	  - the Zephyr image itself is to act as the bootloader, or
	  - Zephyr is a !XIP image, which implicitly assumes existence of a
	  bootloader that loads the Zephyr !XIP image onto SRAM.

config BOOTLOADER_MCUBOOT
	bool "MCUboot bootloader support"
	select USE_DT_CODE_PARTITION
	help
	  This option signifies that the target uses MCUboot as a bootloader,
	  or in other words that the image is to be chain-loaded by MCUboot.
	  This sets several required build system and Device Tree options in
	  order for the image generated to be bootable using the MCUboot open
	  source bootloader. Currently this includes:

	    * Setting TEXT_SECTION_OFFSET to a default value that allows space
	      for the MCUboot image header
	    * Activating SW_VECTOR_RELAY on Cortex-M0 (or Armv8-M baseline)
	      targets with no built-in vector relocation mechanisms

config BOOTLOADER_ESP_IDF
	bool "ESP-IDF bootloader support"
	depends on SOC_ESP32
	help
	  This option will trigger the compilation of the ESP-IDF bootloader
	  inside the build folder.
	  At flash time, the bootloader will be flashed with the zephyr image

config BOOTLOADER_KEXEC
	bool "Boot using Linux kexec() system call"
	depends on X86
	help
	  This option signifies that Linux boots the kernel using kexec system call
	  and utility. This method is used to boot the kernel over the network.

config BOOTLOADER_CONTEXT_RESTORE
	bool "Boot loader has context restore support"
	default y
	depends on SYS_POWER_DEEP_SLEEP_STATES && BOOTLOADER_CONTEXT_RESTORE_SUPPORTED
	help
	  This option signifies that the target has a bootloader
	  that restores CPU context upon resuming from deep sleep
	  power state.

config REBOOT
	bool "Reboot functionality"
	select SYSTEM_CLOCK_DISABLE
	help
	  Enable the sys_reboot() API. Enabling this can drag in other subsystems
	  needed to perform a "safe" reboot (e.g. SYSTEM_CLOCK_DISABLE, to stop the
	  system clock before issuing a reset).

config MISRA_SANE
	bool "MISRA standards compliance features"
	help
	  Causes the source code to build in "MISRA" mode, which
	  disallows some otherwise-permitted features of the C
	  standard for safety reasons.  Specifically variable length
	  arrays are not permitted (and gcc will enforce this).

endmenu

menu "Compatibility"

config COMPAT_INCLUDES
	bool "Suppress warnings when using header shims"
	default y
	help
	  Suppress any warnings from the pre-processor when including
	  deprecated header files.

endmenu