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Non-blank screen during shutdown reboot

Hello,

I am new to DM816x, I have my application clear all the video data (set to black screen)  when program exits.
However, if I run "reboot"  command on my system, the program may not have enough time to go to that screen cleaning part of code.  Is there any way that I can still get clean and black screen when I issue reboot command on my system?

THX!!!