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Up until now, every image includes the time of compilation in the build information. This makes it impossible to verify that a particular image came from a particular source code snapshot. With this change, specifying USE_GIT_DATE=1 to the make command will use the author date of HEAD as the timestamp. That means that successive builds from the same source will produce bitwise-identical output (assuming the same toolchain, of course). BUG=none BRANCH=none TEST=manual Do this twice: \rm -rf build make BOARD=cr50 USE_GIT_DATE=1 md5sum build/cr50/ec.bin The md5sum should be the same for both runs. Change-Id: If64307101a453cb13c62fa003f1bf432f4998273 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/252751 Reviewed-by: Randall Spangler <rspangler@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit