esp-idf/components/bootloader_support/CMakeLists.txt

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CMake
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set(srcs
"src/bootloader_clock.c"
"src/bootloader_common.c"
"src/bootloader_flash.c"
"src/bootloader_random.c"
"src/bootloader_utility.c"
"src/esp_image_format.c"
"src/flash_partitions.c"
"src/flash_qio_mode.c"
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"src/bootloader_flash_config_${IDF_TARGET}.c"
"src/bootloader_efuse_${IDF_TARGET}.c"
)
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if(IDF_TARGET STREQUAL "esp32")
# Not supported on ESP32S2Beta yet
list(APPEND srcs "src/flash_encrypt.c")
endif()
if(BOOTLOADER_BUILD)
set(include_dirs "include" "include_bootloader")
# freertos is included just for the CONFIG_FREERTOS_UNICORE macro
set(priv_requires micro-ecc spi_flash efuse freertos)
list(APPEND srcs
"src/bootloader_init.c"
"src/${IDF_TARGET}/bootloader_sha.c"
"src/${IDF_TARGET}/flash_encrypt.c"
"src/${IDF_TARGET}/secure_boot_signatures.c"
"src/${IDF_TARGET}/secure_boot.c"
"src/${IDF_TARGET}/bootloader_${IDF_TARGET}.c"
)
else()
list(APPEND srcs
"src/idf/bootloader_sha.c"
"src/idf/secure_boot_signatures.c")
set(include_dirs "include")
set(priv_include_dirs "include_bootloader")
set(priv_requires spi_flash mbedtls efuse)
endif()
set(requires soc) #unfortunately the header directly uses SOC registers
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idf_component_register(SRCS "${srcs}"
INCLUDE_DIRS "${include_dirs}"
PRIV_INCLUDE_DIRS "${priv_include_dirs}"
REQUIRES "${requires}"
PRIV_REQUIRES "${priv_requires}")
if(CONFIG_SECURE_SIGNED_APPS)
if(BOOTLOADER_BUILD)
# Whether CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES or not, we need verification key to embed
# in the library.
if(CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES)
# We generate the key from the signing key. The signing key is passed from the main project.
get_filename_component(secure_boot_signing_key
"${SECURE_BOOT_SIGNING_KEY}"
ABSOLUTE BASE_DIR "${project_dir}")
get_filename_component(secure_boot_verification_key
"signature_verification_key.bin"
ABSOLUTE BASE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
add_custom_command(OUTPUT "${secure_boot_verification_key}"
COMMAND ${ESPSECUREPY}
extract_public_key --keyfile "${secure_boot_signing_key}"
"${secure_boot_verification_key}"
DEPENDS ${secure_boot_signing_key}
VERBATIM)
else()
# We expect to 'inherit' the verification key passed from main project.
get_filename_component(secure_boot_verification_key
${SECURE_BOOT_VERIFICATION_KEY}
ABSOLUTE BASE_DIR "${project_dir}")
endif()
else() # normal app build
idf_build_get_property(project_dir PROJECT_DIR)
if(CONFIG_SECURE_BOOT_VERIFICATION_KEY)
# verification-only build supplies verification key
set(secure_boot_verification_key ${CONFIG_SECURE_BOOT_VERIFICATION_KEY})
get_filename_component(secure_boot_verification_key
${secure_boot_verification_key}
ABSOLUTE BASE_DIR "${project_dir}")
else()
# sign at build time, extracts key from signing key
set(secure_boot_verification_key "${CMAKE_BINARY_DIR}/signature_verification_key.bin")
get_filename_component(secure_boot_signing_key
${CONFIG_SECURE_BOOT_SIGNING_KEY}
ABSOLUTE BASE_DIR "${project_dir}")
add_custom_command(OUTPUT "${secure_boot_verification_key}"
COMMAND ${ESPSECUREPY}
extract_public_key --keyfile "${secure_boot_signing_key}"
"${secure_boot_verification_key}"
WORKING_DIRECTORY ${project_dir}
DEPENDS ${secure_boot_signing_key}
VERBATIM)
endif()
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endif()
# Embed the verification key in the binary (app & bootloader)
#
target_add_binary_data(${COMPONENT_LIB} "${secure_boot_verification_key}" "BINARY"
RENAME_TO signature_verification_key_bin)
set_property(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES
"${secure_boot_verification_key}")
endif()