esp-idf/components/bootloader/Makefile.projbuild

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#
# Bootloader component
#
# The bootloader is not a real component that gets linked into the project.
# Instead it is an entire standalone project ( in src/) that gets built in
# the upper projects build directory. This Makefile.projbuild provides the
# glue to build the bootloader project from the original project. It
# basically runs Make in the src/ directory but it needs to zero some variables
# the ESP-IDF project.mk makefile exports first, to not let them interfere.
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#
ifeq ("$(IS_BOOTLOADER_BUILD)","")
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BOOTLOADER_COMPONENT_PATH := $(COMPONENT_PATH)
BOOTLOADER_BUILD_DIR=$(BUILD_DIR_BASE)/bootloader
BOOTLOADER_BIN=$(BOOTLOADER_BUILD_DIR)/bootloader.bin
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.PHONY: bootloader-clean bootloader-flash bootloader $(BOOTLOADER_BIN)
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$(BOOTLOADER_BIN): $(COMPONENT_PATH)/src/sdkconfig
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$(Q) PROJECT_PATH= \
BUILD_DIR_BASE=$(BOOTLOADER_BUILD_DIR) \
$(MAKE) -C $(BOOTLOADER_COMPONENT_PATH)/src MAKEFLAGS= V=$(V) TARGET_BIN_LAYOUT="$(BOOTLOADER_TARGET_BIN_LAYOUT)" $(BOOTLOADER_BIN)
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bootloader-clean:
$(Q) PROJECT_PATH= \
BUILD_DIR_BASE=$(BOOTLOADER_BUILD_DIR) \
$(MAKE) -C $(BOOTLOADER_COMPONENT_PATH)/src app-clean MAKEFLAGS= V=$(V)
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clean: bootloader-clean
bootloader: $(BOOTLOADER_BIN)
@echo "Bootloader built. Default flash command is:"
@echo "$(ESPTOOLPY_WRITE_FLASH) 0x1000 $(BOOTLOADER_BIN)"
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all_binaries: $(BOOTLOADER_BIN)
ESPTOOL_ALL_FLASH_ARGS += 0x1000 $(BOOTLOADER_BIN)
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# synchronise the project level config to the component's
# config
$(COMPONENT_PATH)/src/sdkconfig: $(PROJECT_PATH)/sdkconfig
$(Q) cp $< $@
# bootloader-flash calls flash in the bootloader dummy project
bootloader-flash: $(BOOTLOADER_BIN)
$(MAKE) -C $(BOOTLOADER_COMPONENT_PATH)/src flash MAKEFLAGS= V=$(V)
else
CFLAGS += -D BOOTLOADER_BUILD=1 -I $(IDF_PATH)/components/esp32/include
endif