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PD#SWPL-163760 Problem: When modules send mailbox message to aocpu, sometimes aocpu can not response because of stuck or interrupt signal lost, at this time driver modules need to know whether aocpu is alive or not, this is helpful to debug. Solution: Add aocpu alive check mechanism, when aocpu did not response, system will check and print aocpu status. Verify: S7D-BM209 Change-Id: I285a300313c1439be2ed50fafc58c4a92fa032ac Signed-off-by: Yao Jie <jie.yao@amlogic.com>