bootloader: Add option to build with Link Time Optimisation enabled
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@ -43,7 +43,16 @@ config BOOTLOADER_SPI_WP_PIN
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The default value (GPIO 7) is correct for WP pin on ESP32-D2WD integrated flash.
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endmenu # Bootloader
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config BOOTLOADER_LTO
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bool "Build bootloader with Link Time Optimisation"
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default n
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help
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Setting this option enables gcc Link Time Optimisation for the bootloader build & link pass.
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This gives a smaller bootloader binary (can be useful if secure boot & flash encryption & logging are all enabled), and can
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give faster boot times, but it makes the bootloader harder to debug.
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endmenu # Bootloader config
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menu "Security features"
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@ -217,7 +226,7 @@ config FLASH_ENCRYPTION_UART_BOOTLOADER_ALLOW_CACHE
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config SECURE_BOOT_TEST_MODE
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bool "Secure boot test mode: don't permanently set any efuses"
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depends on SECURE_BOOT_INSECURE
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default N
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default n
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help
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If this option is set, all permanent secure boot changes (via Efuse) are disabled.
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@ -2,3 +2,8 @@
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# paths can be added at this level (we need binary librtc to be
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# available to link bootloader).
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COMPONENT_SUBMODULES += $(IDF_PATH)/components/esp32/lib
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ifdef CONFIG_BOOTLOADER_LTO
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CFLAGS += -flto
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EXTRA_LDFLAGS += -Wl,-flto
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endif
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@ -290,7 +290,7 @@ export HOSTCC HOSTLD HOSTAR HOSTOBJCOPY SIZE
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CC := $(call dequote,$(CONFIG_TOOLPREFIX))gcc
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CXX := $(call dequote,$(CONFIG_TOOLPREFIX))c++
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LD := $(call dequote,$(CONFIG_TOOLPREFIX))ld
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AR := $(call dequote,$(CONFIG_TOOLPREFIX))ar
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AR := $(call dequote,$(CONFIG_TOOLPREFIX))gcc-ar
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OBJCOPY := $(call dequote,$(CONFIG_TOOLPREFIX))objcopy
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SIZE := $(call dequote,$(CONFIG_TOOLPREFIX))size
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export CC CXX LD AR OBJCOPY SIZE
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