boot/zephyr/Kconfig

# Copyright (c) 2017 Linaro Limited
#
# SPDX-License-Identifier: Apache-2.0
#

mainmenu "MCUboot configuration"

comment "MCUboot-specific configuration options"

# Hidden option to mark a project as MCUboot
config MCUBOOT
	default y
	bool
	select MPU_ALLOW_FLASH_WRITE if ARM_MPU

if BOARD_HAS_NRF5_BOOTLOADER

# When compiling MCUBoot, the image will be linked to the boot partition.
# Override .text offset to make sure it is set to zero.
# This is necessary when other bootloaders set a different default for
# application images which are not bootloaders.

config TEXT_SECTION_OFFSET
	default 0x00

endif # BOARD_HAS_NRF5_BOOTLOADER

config BOOT_USE_MBEDTLS
	bool
	# Hidden option
	default n
	help
	  Use mbedTLS for crypto primitives.

config BOOT_USE_TINYCRYPT
	bool
	# Hidden option
	default n
	# When building for ECDSA, we use our own copy of mbedTLS, so the
	# Zephyr one must not be enabled or the MBEDTLS_CONFIG_FILE macros
	# will collide.
	depends on ! MBEDTLS
	help
	  Use TinyCrypt for crypto primitives.

menu "MCUBoot settings"

choice
	prompt "Signature type"
	default BOOT_SIGNATURE_TYPE_RSA

config BOOT_SIGNATURE_TYPE_RSA
	bool "RSA signatures"
	select BOOT_USE_MBEDTLS
	select MBEDTLS

config BOOT_SIGNATURE_TYPE_ECDSA_P256
	bool "Elliptic curve digital signatures with curve P-256"
	select BOOT_USE_TINYCRYPT

endchoice

config BOOT_SIGNATURE_KEY_FILE
	string "PEM key file"
	default ""
	help
	  The key file will be parsed by imgtool's getpub command and a .c source
	  with the public key information will be written in a format expected by
	  MCUboot.

config MBEDTLS_CFG_FILE
	default "mcuboot-mbedtls-cfg.h"

config BOOT_VALIDATE_SLOT0
	bool "Validate image slot 0 on every boot"
	default y
	help
	  If y, the bootloader attempts to validate the signature of
	  slot0 every boot.  This adds the signature check time to
	  every boot, but can mitigate against some changes that are
	  able to modify the flash image itself.

config BOOT_UPGRADE_ONLY
	bool "Overwrite image updates instead of swapping"
	default n
	help
	  If y, overwrite slot0 with the upgrade image instead of
	  swapping them.  This prevents the fallback recovery, but
	  uses a much simpler code path.

config BOOT_BOOTSTRAP
	bool "Boostrap erased slot0 from slot1"
	default n
	help
	  If y, enables bootstraping support. Bootstrapping allows an erased
	  slot0 to be initialized from a valid image in slot1.
	  If unsure, leave at the default value.

config BOOT_ENCRYPT_RSA
	bool "Support for encrypted upgrade images"
	default n
	help
	  If y, images in slot 1 can be encrypted and are decrypted
	  on the fly when upgrading to slot 0, as well as encrypted
	  back when swapping from slot 0 to slot 1.

config BOOT_MAX_IMG_SECTORS
	int "Maximum number of sectors per image slot"
	default 128
	help
	  This option controls the maximum number of sectors that each of
	  the two image areas can contain. Smaller values reduce MCUboot's
	  memory usage; larger values allow it to support larger images.
	  If unsure, leave at the default value.

config BOOT_ERASE_PROGRESSIVELY
	bool "Erase flash progressively when receiving new firmware"
	default y if SOC_NRF52840
	help
	 If enabled, flash is erased as necessary when receiving new firmware,
	 instead of erasing the whole image slot at once. This is necessary
	 on some hardware that has long erase times, to prevent long wait
	 times at the beginning of the DFU process.

config BOOT_WAIT_FOR_USB_DFU
	bool "Wait for a prescribed duration to see if USB DFU is invoked"
	default n
	select USB
	select USB_DFU_CLASS
	select IMG_MANAGER
	help
	  If y, MCUboot waits for a prescribed duration of time to allow
	  for USB DFU to be invoked. Please note DFU always updates the
	  slot1 image.

config ZEPHYR_TRY_MASS_ERASE
	bool "Try to mass erase flash when flashing MCUboot image"
	default y
	help
	  If y, attempt to configure the Zephyr build system's "flash"
	  target to mass-erase the flash device before flashing the
	  MCUboot image. This ensures the scratch and other partitions
	  are in a consistent state.

	  This is not available for all targets.

config BOOT_HAVE_LOGGING
	bool "MCUboot have logging enabled"
	default y
	select LOG
	select LOG_IMMEDIATE
	help
	  If y, enables logging on the serial port. The log level can
	  be defined by setting `CONFIG_MCUBOOT_LOG_LEVEL_*`.
	  If unsure, leave at the default value.

if BOOT_HAVE_LOGGING
module = MCUBOOT
module-dep = LOG
module-str = Log level for MCUBOOT application
source "subsys/logging/Kconfig.template.log_config"
endif

menuconfig MCUBOOT_SERIAL
	bool "MCUboot serial recovery"
	default n
	select REBOOT
	select GPIO
	select SERIAL
	select UART_INTERRUPT_DRIVEN
	select BASE64
	select TINYCBOR
	help
	  If y, enables a serial-port based update mode. This allows
	  MCUboot itself to load update images into flash over a UART.
	  If unsure, leave at the default value.

if MCUBOOT_SERIAL

choice
	prompt "Serial device"
	default BOOT_SERIAL_UART if !BOARD_NRF52840_PCA10059
	default BOOT_SERIAL_CDC_ACM if BOARD_NRF52840_PCA10059

config BOOT_SERIAL_UART
	bool "UART"
	# SERIAL and UART_INTERRUPT_DRIVEN already selected

config BOOT_SERIAL_CDC_ACM
	bool "CDC ACM"
	select USB
	select USB_DEVICE_STACK
	select USB_CDC_ACM

endchoice

config BOOT_MAX_LINE_INPUT_LEN
	int "Maximum command line length"
	default 512
	help
	  Maximum length of commands transported over the serial port.

config BOOT_SERIAL_DETECT_PORT
	string "GPIO device to trigger serial recovery mode"
	default GPIO_0 if SOC_FAMILY_NRF
	help
	  Zephyr GPIO device which contains the pin used to trigger
	  serial recovery mode.

config BOOT_SERIAL_DETECT_PIN
	int "Pin to trigger serial recovery mode"
	default 11 if BOARD_NRF52840_PCA10056
	default 13 if BOARD_NRF52_PCA10040
	help
	  Pin on the serial detect port which triggers serial recovery mode.

config BOOT_SERIAL_DETECT_PIN_VAL
	int "Serial detect pin trigger value"
	default 0
	range 0 1
	help
	  Logic value of the detect pin which triggers serial recovery
	  mode.

endif # MCUBOOT_SERIAL

endmenu

config MCUBOOT_DEVICE_SETTINGS
	# Hidden selector for device-specific settings
	bool
	default y
        # CPU options
	select MCUBOOT_DEVICE_CPU_CORTEX_M0 if CPU_CORTEX_M0
        # Enable flash page layout if available
	select FLASH_PAGE_LAYOUT if FLASH_HAS_PAGE_LAYOUT
	# Enable flash_map module as flash I/O back-end
	select FLASH_MAP

config MCUBOOT_DEVICE_CPU_CORTEX_M0
	# Hidden selector for Cortex-M0 settings
	bool
	default n
	select SW_VECTOR_RELAY if !CPU_CORTEX_M0_HAS_VECTOR_TABLE_REMAP

comment "Zephyr configuration options"

config ZEPHYR_BASE
	string
	option env="ZEPHYR_BASE"

source "$ZEPHYR_BASE/Kconfig.zephyr"