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bootloader: Add option to build with Link Time Optimisation enabled

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This commit is contained in:
Angus Gratton
2017-06-30 17:14:50 +10:00
committed by Angus Gratton
parent 17adb40ca8
commit d1b66a08c1
3 changed files with 17 additions and 3 deletions
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13
components/bootloader/Kconfig.projbuild
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@@ -43,7 +43,16 @@ config BOOTLOADER_SPI_WP_PIN
The default value (GPIO 7) is correct for WP pin on ESP32-D2WD integrated flash. The default value (GPIO 7) is correct for WP pin on ESP32-D2WD integrated flash.
endmenu # Bootloader config BOOTLOADER_LTO
bool "Build bootloader with Link Time Optimisation"
default n
help
Setting this option enables gcc Link Time Optimisation for the bootloader build & link pass.
This gives a smaller bootloader binary (can be useful if secure boot & flash encryption & logging are all enabled), and can
give faster boot times, but it makes the bootloader harder to debug.
endmenu # Bootloader config
menu "Security features" menu "Security features"
@@ -217,7 +226,7 @@ config FLASH_ENCRYPTION_UART_BOOTLOADER_ALLOW_CACHE
config SECURE_BOOT_TEST_MODE config SECURE_BOOT_TEST_MODE
bool "Secure boot test mode: don't permanently set any efuses" bool "Secure boot test mode: don't permanently set any efuses"
depends on SECURE_BOOT_INSECURE depends on SECURE_BOOT_INSECURE
default N default n
help help
If this option is set, all permanent secure boot changes (via Efuse) are disabled. If this option is set, all permanent secure boot changes (via Efuse) are disabled.

5
components/bootloader/subproject/main/Makefile.projbuild
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@@ -2,3 +2,8 @@
# paths can be added at this level (we need binary librtc to be # paths can be added at this level (we need binary librtc to be
# available to link bootloader). # available to link bootloader).
COMPONENT_SUBMODULES += $(IDF_PATH)/components/esp32/lib COMPONENT_SUBMODULES += $(IDF_PATH)/components/esp32/lib
ifdef CONFIG_BOOTLOADER_LTO
CFLAGS += -flto
EXTRA_LDFLAGS += -Wl,-flto
endif

2
make/project.mk
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@@ -290,7 +290,7 @@ export HOSTCC HOSTLD HOSTAR HOSTOBJCOPY SIZE
CC := $(call dequote,$(CONFIG_TOOLPREFIX))gcc CC := $(call dequote,$(CONFIG_TOOLPREFIX))gcc
CXX := $(call dequote,$(CONFIG_TOOLPREFIX))c++ CXX := $(call dequote,$(CONFIG_TOOLPREFIX))c++
LD := $(call dequote,$(CONFIG_TOOLPREFIX))ld LD := $(call dequote,$(CONFIG_TOOLPREFIX))ld
AR := $(call dequote,$(CONFIG_TOOLPREFIX))ar AR := $(call dequote,$(CONFIG_TOOLPREFIX))gcc-ar
OBJCOPY := $(call dequote,$(CONFIG_TOOLPREFIX))objcopy OBJCOPY := $(call dequote,$(CONFIG_TOOLPREFIX))objcopy
SIZE := $(call dequote,$(CONFIG_TOOLPREFIX))size SIZE := $(call dequote,$(CONFIG_TOOLPREFIX))size
export CC CXX LD AR OBJCOPY SIZE export CC CXX LD AR OBJCOPY SIZE