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We don't really have the ability to build the latest signer yet, but this should not stop us from being able to build a properly signed image using the ec makefiles. As a stopgap measure the suggestion is to keep the latest signer binary in ~/bin/codesigner in chroot, then with this patch applied invoking make with CR50_DEV=1 will cause the proper sighner used and proper signing procedure followed. The signed targets need to be built in series to avoid concurrent use of the signer fob, an addition dependency is being added to enforce that. BRANCH=none BUG=chrome-os-partner:55557 TEST=ran make as follows: CR50_DEV=1 make BOARD=cr50 touched the fob when requested, uploaded the generated build/cr50/ec.bin on a kevin-tpm2 using usb_updater, and observed it boot properly with the new version. Change-Id: Ia9494bdc60b4bd3b8e5e09cbcbd8b27409c739d2 Signed-off-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/376885 Tested-by: Bill Richardson <wfrichar@chromium.org> Reviewed-by: Bill Richardson <wfrichar@chromium.org>