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The CR50 RO version is identified not just by the git hash, but also by the fuse settings and keys used for signing. The first four bytes of the entire RO image's hash are saved in the image header. Adding these four bytes to the version string reported to the host allows to uniquely identify both RO and RW firmware versions. BRANCH=none BUG=none TEST=verified that the appropriate string is showing up: localhost ~ # grep cr50 /sys/firmware/log Firmware version: RO: 97594095 RW: cr50_v1.1.4803-dcac93a-dirty localhost ~ # Change-Id: I30a21fad15d99523b1edfa1baa32d80b44e7d0df Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/356735 Reviewed-by: Scott Collyer <scollyer@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly