set(BOOTLOADER_OFFSET 0x1000) # Do not generate flash file when building bootloader if(BOOTLOADER_BUILD) return() endif() # Glue to build the bootloader subproject binary as an external # cmake project under this one # # idf_build_get_property(build_dir BUILD_DIR) set(BOOTLOADER_BUILD_DIR "${build_dir}/bootloader") set(bootloader_binary_files "${BOOTLOADER_BUILD_DIR}/bootloader.elf" "${BOOTLOADER_BUILD_DIR}/bootloader.bin" "${BOOTLOADER_BUILD_DIR}/bootloader.map" ) idf_build_get_property(project_dir PROJECT_DIR) # There are some additional processing when CONFIG_CONFIG_SECURE_SIGNED_APPS. This happens # when either CONFIG_SECURE_BOOT_ENABLED or SECURE_BOOT_BUILD_SIGNED_BINARIES. # For both cases, the user either sets binaries to be signed during build or not # using CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES. # # Regardless, pass the main project's keys (signing/verification) to the bootloader subproject # via config. if(CONFIG_SECURE_SIGNED_APPS) add_custom_target(gen_secure_boot_keys) if(CONFIG_SECURE_BOOT_ENABLED) # Check that the configuration is sane if((CONFIG_SECURE_BOOTLOADER_REFLASHABLE AND CONFIG_SECURE_BOOTLOADER_ONE_TIME_FLASH) OR (NOT CONFIG_SECURE_BOOTLOADER_REFLASHABLE AND NOT CONFIG_SECURE_BOOTLOADER_ONE_TIME_FLASH)) fail_at_build_time(bootloader "Invalid bootloader target: bad sdkconfig?") endif() if(CONFIG_SECURE_BOOTLOADER_REFLASHABLE) set(bootloader_binary_files ${bootloader_binary_files} "${BOOTLOADER_BUILD_DIR}/bootloader-reflash-digest.bin" "${BOOTLOADER_BUILD_DIR}/secure-bootloader-key-192.bin" "${BOOTLOADER_BUILD_DIR}/secure-bootloader-key-256.bin" ) endif() endif() # Since keys are usually given relative to main project dir, get the absolute paths to the keys # for use by the bootloader subproject. Replace the values in config with these absolute paths, # so that bootloader subproject does not need to assume main project dir to obtain path to the keys. if(CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES) get_filename_component(secure_boot_signing_key "${CONFIG_SECURE_BOOT_SIGNING_KEY}" ABSOLUTE BASE_DIR "${project_dir}") if(NOT EXISTS ${secure_boot_signing_key}) # If the signing key is not found, create a phony gen_secure_boot_signing_key target that # fails the build. fail_at_build_time causes a cmake run next time # (to pick up a new signing key if one exists, etc.) fail_at_build_time(gen_secure_boot_signing_key "Secure Boot Signing Key ${CONFIG_SECURE_BOOT_SIGNING_KEY} does not exist. Generate using:" "\tespsecure.py generate_signing_key ${CONFIG_SECURE_BOOT_SIGNING_KEY}") else() add_custom_target(gen_secure_boot_signing_key) endif() set(SECURE_BOOT_SIGNING_KEY ${secure_boot_signing_key}) # needed by some other components set(sign_key_arg "-DSECURE_BOOT_SIGNING_KEY=${secure_boot_signing_key}") add_dependencies(gen_secure_boot_keys gen_secure_boot_signing_key) else() get_filename_component(secure_boot_verification_key ${CONFIG_SECURE_BOOT_VERIFICATION_KEY} ABSOLUTE BASE_DIR "${project_dir}") if(NOT EXISTS ${secure_boot_verification_key}) # If the verification key is not found, create a phony gen_secure_boot_verification_key target that # fails the build. fail_at_build_time causes a cmake run next time # (to pick up a new verification key if one exists, etc.) fail_at_build_time(gen_secure_boot_verification_key "Secure Boot Verification Public Key ${CONFIG_SECURE_BOOT_VERIFICATION_KEY} does not exist." "\tThis can be extracted from the private signing key." "\tSee docs/security/secure-boot.rst for details.") else() add_custom_target(gen_secure_boot_verification_key) endif() set(ver_key_arg "-DSECURE_BOOT_VERIFICATION_KEY=${secure_boot_verification_key}") add_dependencies(gen_secure_boot_keys gen_secure_boot_verification_key) endif() endif() idf_build_get_property(idf_path IDF_PATH) idf_build_get_property(idf_target IDF_TARGET) idf_build_get_property(sdkconfig SDKCONFIG) externalproject_add(bootloader SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/subproject" BINARY_DIR "${BOOTLOADER_BUILD_DIR}" CMAKE_ARGS -DSDKCONFIG=${sdkconfig} -DIDF_PATH=${idf_path} -DIDF_TARGET=${idf_target} -DPYTHON_DEPS_CHECKED=1 -DEXTRA_COMPONENT_DIRS=${CMAKE_CURRENT_LIST_DIR} ${sign_key_arg} ${ver_key_arg} # LEGACY_INCLUDE_COMMON_HEADERS has to be passed in via cache variable since # the bootloader common component requirements depends on this and # config variables are not available before project() call. -DLEGACY_INCLUDE_COMMON_HEADERS=${CONFIG_LEGACY_INCLUDE_COMMON_HEADERS} INSTALL_COMMAND "" BUILD_ALWAYS 1 # no easy way around this... BUILD_BYPRODUCTS ${bootloader_binary_files} ) if(CONFIG_SECURE_SIGNED_APPS) add_dependencies(bootloader gen_secure_boot_keys) endif() # this is a hack due to an (annoying) shortcoming in cmake, it can't # extend the 'clean' target to the external project # see thread: https://cmake.org/pipermail/cmake/2016-December/064660.html # # So for now we just have the top-level build remove the final build products... set_property(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${bootloader_binary_files})