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Kconfig.zephyr
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Kconfig.zephyr
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# Kconfig - 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 these first so that any properties (e.g. defaults) below can be
# overridden in *.defconfig files (by defining symbols in multiple locations).
# After merging all the symbol definitions, Kconfig picks the first property
# (e.g. the first default) with a satisfied condition.
#
# Board defaults should be parsed before SoC defaults, because boards usually
# overrides SoC values.
#
# Note: $ARCH and $BOARD_DIR might be glob patterns.
source "$(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"
source "ext/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.
config USE_CODE_PARTITION
bool "link into code-partition"
depends on HAS_FLASH_LOAD_OFFSET
help
When selected application will be linked into chosen code-partition.
# Workaround for not being able to have commas in macro arguments
DT_CHOSEN_Z_CODE_PARTITION := zephyr,code-partition
config FLASH_LOAD_OFFSET
hex "Kernel load offset"
default $(dt_chosen_reg_addr_hex,$(DT_CHOSEN_Z_CODE_PARTITION)) if USE_CODE_PARTITION
default 0
depends on HAS_FLASH_LOAD_OFFSET
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
hex "Kernel load size"
default $(dt_chosen_reg_size_hex,$(DT_CHOSEN_Z_CODE_PARTITION)) if USE_CODE_PARTITION
default 0
depends on HAS_FLASH_LOAD_OFFSET
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.
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
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_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."
depends on BUILD_OUTPUT_HEX || BUILD_OUTPUT_BIN || BUILD_OUTPUT_S19
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.
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_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
* Including dts/common/mcuboot.overlay when building the Device
Tree in order to place and link the image at the slot0 offset
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