On our AM335x design, a black block repeatedly redraws itself at the same position even though my program fills the frame buffer with white. The screen is completely white for a 1sec, then the black block redraws at the same spot again. The root file system is based on the basic filesystem from SDK 05.07.00.00, arago-base-tisdk-image-am335x-evm.tar.gz, so there is no X or QT libs. I've looked in the frame buffer kernel config options and didn't find anything.
I'm guessing that it is a cursor of some sort. If anyone has any ideas of how to get rid of it or where to investigate further, I'd appreciate it. Thanks in advance.