| # Copyright (c) 2020-2025 Nordic Semiconductor ASA |
| # SPDX-License-Identifier: Apache-2.0 |
| |
| # This file includes extra build system logic that is enabled when |
| # CONFIG_BOOTLOADER_MCUBOOT=y. |
| # |
| # It builds signed binaries using imgtool as a post-processing step |
| # after zephyr/zephyr.elf is created in the build directory. |
| # |
| # Since this file is brought in via include(), we do the work in a |
| # function to avoid polluting the top-level scope. |
| |
| function(zephyr_runner_file type path) |
| # Property magic which makes west flash choose the signed build |
| # output of a given type. |
| set_target_properties(runners_yaml_props_target PROPERTIES "${type}_file" "${path}") |
| endfunction() |
| |
| function(zephyr_mcuboot_tasks) |
| set(keyfile "${CONFIG_MCUBOOT_SIGNATURE_KEY_FILE}") |
| set(keyfile_enc "${CONFIG_MCUBOOT_ENCRYPTION_KEY_FILE}") |
| |
| if(NOT "${CONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE}") |
| # Check for misconfiguration. |
| if("${keyfile}" STREQUAL "") |
| # No signature key file, no signed binaries. No error, though: |
| # this is the documented behavior. |
| message(WARNING "Neither CONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE or " |
| "CONFIG_MCUBOOT_SIGNATURE_KEY_FILE are set, the generated build will not be " |
| "bootable by MCUboot unless it is signed manually/externally.") |
| return() |
| endif() |
| endif() |
| |
| if(NOT WEST) |
| # This feature requires west. |
| message(FATAL_ERROR "Can't sign images for MCUboot: west not found. To fix, install west and ensure it's on PATH.") |
| endif() |
| |
| foreach(file keyfile keyfile_enc) |
| if(NOT "${${file}}" STREQUAL "") |
| if(NOT IS_ABSOLUTE "${${file}}") |
| # Relative paths are relative to 'west topdir'. |
| set(${file} "${WEST_TOPDIR}/${${file}}") |
| endif() |
| |
| if(NOT EXISTS "${${file}}" AND NOT "${CONFIG_MCUBOOT_GENERATE_UNSIGNED_IMAGE}") |
| message(FATAL_ERROR "west sign can't find file ${${file}} (Note: Relative paths are relative to the west workspace topdir \"${WEST_TOPDIR}\")") |
| elseif(NOT (CONFIG_BUILD_OUTPUT_BIN OR CONFIG_BUILD_OUTPUT_HEX)) |
| message(FATAL_ERROR "Can't sign images for MCUboot: Neither CONFIG_BUILD_OUTPUT_BIN nor CONFIG_BUILD_OUTPUT_HEX is enabled, so there's nothing to sign.") |
| endif() |
| endif() |
| endforeach() |
| |
| # No imgtool, no signed binaries. |
| if(NOT DEFINED IMGTOOL) |
| message(FATAL_ERROR "Can't sign images for MCUboot: can't find imgtool. To fix, install imgtool with pip3, or add the mcuboot repository to the west manifest and ensure it has a scripts/imgtool.py file.") |
| return() |
| endif() |
| |
| # Fetch devicetree details for flash and slot information |
| dt_chosen(flash_node PROPERTY "zephyr,flash") |
| dt_nodelabel(slot0_flash NODELABEL "slot0_partition" REQUIRED) |
| dt_prop(slot_size PATH "${slot0_flash}" PROPERTY "reg" INDEX 1 REQUIRED) |
| dt_prop(write_block_size PATH "${flash_node}" PROPERTY "write-block-size") |
| |
| if(NOT write_block_size) |
| set(write_block_size 4) |
| message(WARNING "slot0_partition write block size devicetree parameter is missing, assuming write block size is 4") |
| endif() |
| |
| # If single slot mode, or if in firmware updater mode and this is the firmware updater image, |
| # use slot 0 information |
| if(NOT CONFIG_MCUBOOT_BOOTLOADER_MODE_SINGLE_APP AND (NOT CONFIG_MCUBOOT_BOOTLOADER_MODE_FIRMWARE_UPDATER OR CONFIG_MCUBOOT_APPLICATION_FIRMWARE_UPDATER)) |
| # Slot 1 size is used instead of slot 0 size |
| set(slot_size) |
| dt_nodelabel(slot1_flash NODELABEL "slot1_partition" REQUIRED) |
| dt_prop(slot_size PATH "${slot1_flash}" PROPERTY "reg" INDEX 1 REQUIRED) |
| endif() |
| |
| # Basic 'imgtool sign' command with known image information. |
| set(imgtool_sign ${PYTHON_EXECUTABLE} ${IMGTOOL} sign |
| --version ${CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION} --header-size ${CONFIG_ROM_START_OFFSET} |
| --slot-size ${slot_size}) |
| |
| # Arguments to imgtool. |
| if(NOT CONFIG_MCUBOOT_EXTRA_IMGTOOL_ARGS STREQUAL "") |
| # Separate extra arguments into the proper format for adding to |
| # extra_post_build_commands. |
| # |
| # Use UNIX_COMMAND syntax for uniform results across host |
| # platforms. |
| separate_arguments(imgtool_args UNIX_COMMAND ${CONFIG_MCUBOOT_EXTRA_IMGTOOL_ARGS}) |
| else() |
| set(imgtool_args) |
| endif() |
| |
| if(NOT "${keyfile}" STREQUAL "") |
| set(imgtool_args --key "${keyfile}" ${imgtool_args}) |
| endif() |
| |
| if(CONFIG_MCUBOOT_IMGTOOL_OVERWRITE_ONLY) |
| # Use overwrite-only instead of swap upgrades. |
| set(imgtool_args --overwrite-only --align 1 ${imgtool_args}) |
| elseif(CONFIG_MCUBOOT_BOOTLOADER_MODE_RAM_LOAD) |
| # RAM load requires setting the location of where to load the image to |
| dt_chosen(chosen_ram PROPERTY "zephyr,sram") |
| dt_reg_addr(chosen_ram_address PATH ${chosen_ram}) |
| dt_nodelabel(slot0_partition NODELABEL "slot0_partition" REQUIRED) |
| dt_reg_addr(slot0_partition_address PATH ${slot0_partition}) |
| dt_nodelabel(slot1_partition NODELABEL "slot1_partition" REQUIRED) |
| dt_reg_addr(slot1_partition_address PATH ${slot1_partition}) |
| |
| set(imgtool_args --align 1 --load-addr ${chosen_ram_address} ${imgtool_args}) |
| set(imgtool_args_alt_slot ${imgtool_args} --hex-addr ${slot1_partition_address}) |
| set(imgtool_args ${imgtool_args} --hex-addr ${slot0_partition_address}) |
| else() |
| set(imgtool_args --align ${write_block_size} ${imgtool_args}) |
| endif() |
| |
| # Extensionless prefix of any output file. |
| set(output ${ZEPHYR_BINARY_DIR}/${KERNEL_NAME}) |
| |
| # List of additional build byproducts. |
| set(byproducts) |
| |
| # Set up .bin outputs. |
| if(CONFIG_BUILD_OUTPUT_BIN) |
| list(APPEND byproducts ${output}.signed.bin) |
| zephyr_runner_file(bin ${output}.signed.bin) |
| set(BYPRODUCT_KERNEL_SIGNED_BIN_NAME "${output}.signed.bin" |
| CACHE FILEPATH "Signed kernel bin file" FORCE |
| ) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} ${output}.bin ${output}.signed.bin) |
| |
| if(CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE) |
| list(APPEND byproducts ${output}.signed.confirmed.bin) |
| set(BYPRODUCT_KERNEL_SIGNED_CONFIRMED_BIN_NAME "${output}.signed.confirmed.bin" |
| CACHE FILEPATH "Signed and confirmed kernel bin file" FORCE |
| ) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} --pad --confirm ${output}.bin |
| ${output}.signed.confirmed.bin) |
| endif() |
| |
| if(NOT "${keyfile_enc}" STREQUAL "") |
| list(APPEND byproducts ${output}.signed.encrypted.bin) |
| set(BYPRODUCT_KERNEL_SIGNED_ENCRYPTED_BIN_NAME "${output}.signed.encrypted.bin" |
| CACHE FILEPATH "Signed and encrypted kernel bin file" FORCE |
| ) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} --encrypt "${keyfile_enc}" ${output}.bin |
| ${output}.signed.encrypted.bin) |
| endif() |
| |
| if(CONFIG_MCUBOOT_BOOTLOADER_MODE_RAM_LOAD) |
| list(APPEND byproducts ${output}.slot1.signed.encrypted.bin) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args_alt_slot} ${output}.bin |
| ${output}.slot1.signed.bin) |
| |
| if(CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE) |
| list(APPEND byproducts ${output}.slot1.signed.confirmed.bin) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args_alt_slot} --pad --confirm ${output}.bin |
| ${output}.slot1.signed.confirmed.bin) |
| endif() |
| |
| if(NOT "${keyfile_enc}" STREQUAL "") |
| list(APPEND byproducts ${output}.slot1.signed.encrypted.bin) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args_alt_slot} --encrypt "${keyfile_enc}" |
| ${output}.bin ${output}.slot1.signed.encrypted.bin) |
| endif() |
| endif() |
| endif() |
| |
| # Set up .hex outputs. |
| if(CONFIG_BUILD_OUTPUT_HEX) |
| list(APPEND byproducts ${output}.signed.hex) |
| zephyr_runner_file(hex ${output}.signed.hex) |
| set(BYPRODUCT_KERNEL_SIGNED_HEX_NAME "${output}.signed.hex" |
| CACHE FILEPATH "Signed kernel hex file" FORCE |
| ) |
| |
| if(NOT "${keyfile_enc}" STREQUAL "") |
| # When encryption is enabled, set the encrypted bit when signing the image but do not |
| # encrypt the data, this means that when the image is moved out of the primary into the |
| # secondary, it will be encrypted rather than being in unencrypted |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} --encrypt "${keyfile_enc}" --clear |
| ${output}.hex ${output}.signed.hex) |
| else() |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} ${output}.hex ${output}.signed.hex) |
| endif() |
| |
| if(CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE) |
| list(APPEND byproducts ${output}.signed.confirmed.hex) |
| set(BYPRODUCT_KERNEL_SIGNED_CONFIRMED_HEX_NAME "${output}.signed.confirmed.hex" |
| CACHE FILEPATH "Signed and confirmed kernel hex file" FORCE |
| ) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} --pad --confirm ${output}.hex |
| ${output}.signed.confirmed.hex) |
| endif() |
| |
| if(NOT "${keyfile_enc}" STREQUAL "") |
| list(APPEND byproducts ${output}.signed.encrypted.hex) |
| set(BYPRODUCT_KERNEL_SIGNED_ENCRYPTED_HEX_NAME "${output}.signed.encrypted.hex" |
| CACHE FILEPATH "Signed and encrypted kernel hex file" FORCE |
| ) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args} --encrypt "${keyfile_enc}" ${output}.hex |
| ${output}.signed.encrypted.hex) |
| endif() |
| |
| if(CONFIG_MCUBOOT_BOOTLOADER_MODE_RAM_LOAD) |
| list(APPEND byproducts ${output}.slot1.signed.hex) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args_alt_slot} ${output}.hex |
| ${output}.slot1.signed.hex) |
| |
| if(CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE) |
| list(APPEND byproducts ${output}.slot1.signed.confirmed.hex) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args_alt_slot} --pad --confirm ${output}.hex |
| ${output}.slot1.signed.confirmed.hex) |
| endif() |
| |
| if(NOT "${keyfile_enc}" STREQUAL "") |
| list(APPEND byproducts ${output}.slot1.signed.encrypted.hex) |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_commands COMMAND |
| ${imgtool_sign} ${imgtool_args_alt_slot} --encrypt "${keyfile_enc}" |
| ${output}.hex ${output}.slot1.signed.encrypted.hex) |
| endif() |
| endif() |
| endif() |
| set_property(GLOBAL APPEND PROPERTY extra_post_build_byproducts ${byproducts}) |
| endfunction() |
| |
| zephyr_mcuboot_tasks() |
