esp-idf/components/bootloader/CMakeLists.txt

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CMake
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idf_component_register(PRIV_REQUIRES partition_table esptool_py)
# Do not generate flash file when building bootloader or is in early expansion of the build
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if(BOOTLOADER_BUILD OR NOT CONFIG_APP_BUILD_BOOTLOADER)
return()
endif()
add_dependencies(bootloader partition_table_bin)
# When secure boot is enabled, do not flash bootloader along with invocation of `idf.py flash`
if(NOT CONFIG_SECURE_BOOT)
set(flash_bootloader FLASH_IN_PROJECT)
endif()
esptool_py_custom_target(bootloader-flash bootloader "bootloader")
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esptool_py_flash_target_image(bootloader-flash bootloader
${CONFIG_BOOTLOADER_OFFSET_IN_FLASH}
"${BOOTLOADER_BUILD_DIR}/bootloader.bin")
# Also attach an image to the project flash target
if(NOT CONFIG_SECURE_BOOT)
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esptool_py_flash_target_image(flash bootloader
${CONFIG_BOOTLOADER_OFFSET_IN_FLASH}
"${BOOTLOADER_BUILD_DIR}/bootloader.bin")
endif()