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Depthcharge currently asks EC whether recovery was requested manually or not without verifying EC is in RO or not. If EC-RW is compromised, recovery switch state can be spoofed. This patch makes Depthcharge check EC_IN_RW to determine whether EC is in RO or not. Only if it's in RO and it says recovery button was pressed at boot, we proceed to the recovery process. All other recovery requests including manual recovery requested by a (compromised) host will end up with 'broken' screen. BUG=b:66516882 BRANCH=none TEST=Boot Fizz. make runtests. Change-Id: I01d2df05fe22e79bbc949f5cb83db605147667b3 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/693008 Reviewed-by: Randall Spangler <rspangler@chromium.org>