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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#
ifndef IS_BOOTLOADER_BUILD
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BOOTLOADER_COMPONENT_PATH := $(COMPONENT_PATH)
BOOTLOADER_BUILD_DIR=$(abspath $(BUILD_DIR_BASE)/bootloader)
BOOTLOADER_BIN=$(BOOTLOADER_BUILD_DIR)/bootloader.bin
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# signing key path is resolved relative to the project directory
SECURE_BOOT_SIGNING_KEY=$(abspath $(call dequote,$(CONFIG_SECURE_BOOT_SIGNING_KEY)))
export SECURE_BOOT_SIGNING_KEY # used by bootloader_support component
# Has a matching value in bootloader_support esp_flash_partitions.h
BOOTLOADER_OFFSET := 0x1000
# Custom recursive make for bootloader sub-project
BOOTLOADER_MAKE=+$(MAKE) -C $(BOOTLOADER_COMPONENT_PATH)/src \
V=$(V) BUILD_DIR_BASE=$(BOOTLOADER_BUILD_DIR) TEST_COMPONENTS=
.PHONY: bootloader-clean bootloader-flash bootloader $(BOOTLOADER_BIN)
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$(BOOTLOADER_BIN): $(SDKCONFIG_MAKEFILE)
$(BOOTLOADER_MAKE) $@
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clean: bootloader-clean
ifndef CONFIG_SECURE_BOOT_ENABLED
# If secure boot disabled, bootloader flashing is integrated
# with 'make flash' and no warnings are printed.
bootloader: $(BOOTLOADER_BIN)
@echo $(SEPARATOR)
@echo "Bootloader built. Default flash command is:"
@echo "$(ESPTOOLPY_WRITE_FLASH) $(BOOTLOADER_OFFSET) $^"
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ESPTOOL_ALL_FLASH_ARGS += $(BOOTLOADER_OFFSET) $(BOOTLOADER_BIN)
bootloader-flash: $(BOOTLOADER_BIN) $(call prereq_if_explicit,erase_flash)
$(ESPTOOLPY_WRITE_FLASH) 0x1000 $^
else ifdef CONFIG_SECURE_BOOTLOADER_ONE_TIME_FLASH
# One time flashing requires user to run esptool.py command themselves,
# and warning is printed about inability to reflash.
#
# The flashing command is deliberately printed without an auto-reset
# step, so the device doesn't immediately reset to flash itself.
bootloader: $(BOOTLOADER_BIN)
@echo $(SEPARATOR)
@echo "Bootloader built. One-time flash command is:"
@echo "$(subst hard_reset,no_reset,$(ESPTOOLPY_WRITE_FLASH)) $(BOOTLOADER_OFFSET) $(BOOTLOADER_BIN)"
@echo $(SEPARATOR)
@echo "* IMPORTANT: After first boot, BOOTLOADER CANNOT BE RE-FLASHED on same device"
else ifdef CONFIG_SECURE_BOOTLOADER_REFLASHABLE
# Reflashable secure bootloader
# generates a digest binary (bootloader + digest)
BOOTLOADER_DIGEST_BIN := $(BOOTLOADER_BUILD_DIR)/bootloader-reflash-digest.bin
SECURE_BOOTLOADER_KEY := $(BOOTLOADER_BUILD_DIR)/secure-bootloader-key.bin
ifdef CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES
$(SECURE_BOOTLOADER_KEY): $(SECURE_BOOT_SIGNING_KEY)
$(ESPSECUREPY) digest_private_key -k $< $@
else
$(SECURE_BOOTLOADER_KEY):
@echo "No pre-generated key for a reflashable secure bootloader is available, due to signing configuration."
@echo "To generate one, you can use this command:"
@echo "espsecure.py generate_flash_encryption_key $@"
@echo "then re-run make."
exit 1
endif
bootloader: $(BOOTLOADER_DIGEST_BIN)
@echo $(SEPARATOR)
@echo "Bootloader built and secure digest generated. First time flash command is:"
@echo "$(ESPEFUSEPY) burn_key secure_boot $(SECURE_BOOTLOADER_KEY)"
@echo "$(ESPTOOLPY_WRITE_FLASH) $(BOOTLOADER_OFFSET) $(BOOTLOADER_BIN)"
@echo $(SEPARATOR)
@echo "To reflash the bootloader after initial flash:"
@echo "$(ESPTOOLPY_WRITE_FLASH) 0x0 $(BOOTLOADER_DIGEST_BIN)"
@echo $(SEPARATOR)
@echo "* After first boot, only re-flashes of this kind (with same key) will be accepted."
@echo "* Not recommended to re-use the same secure boot keyfile on multiple production devices."
$(BOOTLOADER_DIGEST_BIN): $(BOOTLOADER_BIN) $(SECURE_BOOTLOADER_KEY)
@echo "DIGEST $(notdir $@)"
$(Q) $(ESPSECUREPY) digest_secure_bootloader -k $(SECURE_BOOTLOADER_KEY) -o $@ $<
else
bootloader:
@echo "Invalid bootloader target: bad sdkconfig?"
@exit 1
endif
ifndef CONFIG_SECURE_BOOT_ENABLED
# don't build bootloader by default is secure boot is enabled
all_binaries: $(BOOTLOADER_BIN)
endif
bootloader-clean:
$(BOOTLOADER_MAKE) app-clean
rm -f $(SECURE_BOOTLOADER_KEY) $(BOOTLOADER_DIGEST_BIN)
$(BOOTLOADER_BUILD_DIR):
mkdir -p $@
else
CFLAGS += -D BOOTLOADER_BUILD=1 -I $(IDF_PATH)/components/esp32/include
endif