diff options
| author | Keith Short <keithshort@chromium.org> | 2021-03-19 10:20:27 -0600 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-03-24 20:19:48 +0000 |
| commit | d3468b111247e43ffdc1855f1c07ad802f1c3cc2 (patch) | |
| tree | d781083a272121adeadd3b5f3f821f92e2a52dc0 /zephyr/app | |
| parent | 5eb23205dd023a738a9cbc0ae90661a898274180 (diff) | |
| download | chrome-ec-d3468b111247e43ffdc1855f1c07ad802f1c3cc2.tar.gz | |
zephyr: Enable link time optimization (LTO)
The upstream Zephyr repo does not support LTO. Reconfigure the
platform/ec source files into a cmake library so the LTO option can be
enabled for all the platorm/ec sources.
This reduces the Volteer flash image size by 9176 bytes.
BUG=none
BRANCH=none
TEST=zmake testall
TEST=boot zephyr-ec on Volteer, verfiy AP boots
Cq-Depend: chromium:2776218
Signed-off-by: Keith Short <keithshort@chromium.org>
Change-Id: I8312773c8b21c498ec8116a8558b7571831159ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2776217
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Diffstat (limited to 'zephyr/app')
| -rw-r--r-- | zephyr/app/ec/CMakeLists.txt | 2 | ||||
| -rw-r--r-- | zephyr/app/ec/Kconfig | 12 |
2 files changed, 13 insertions, 1 deletions
diff --git a/zephyr/app/ec/CMakeLists.txt b/zephyr/app/ec/CMakeLists.txt index 608d2343fb..43f4ff2fe2 100644 --- a/zephyr/app/ec/CMakeLists.txt +++ b/zephyr/app/ec/CMakeLists.txt @@ -3,5 +3,5 @@ # found in the LICENSE file. if(NOT DEFINED CONFIG_ZTEST) - target_sources(app PRIVATE main.c) + zephyr_library_sources(main.c) endif() diff --git a/zephyr/app/ec/Kconfig b/zephyr/app/ec/Kconfig index b0dab67c1b..c5ca463457 100644 --- a/zephyr/app/ec/Kconfig +++ b/zephyr/app/ec/Kconfig @@ -18,6 +18,18 @@ if CROS_EC rsource "soc/Kconfig" +config LTO + bool "Link Time Optimization (LTO)" + default y if !SOC_POSIX + help + Enable the Link Time Optimization (LTO) feature for the toolchain. + LTO expands the scope of optimizations to encompass the whole program, + reducing the image size. + + At this time, LTO is only enabled for Chromium OS source files and + is not enabled for the Zephyr kernel or drivers due. + https://github.com/zephyrproject-rtos/zephyr/issues/2112 + choice CBPRINTF_IMPLEMENTATION default CBPRINTF_NANO |