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how to clone frame buffer fb0 to frame buffer fb1

Hi

we have a DM814x custom board. we have two displays with different resolutions to be connected to the board.

we want the data on frame buffer fb0 to be cloned onto the frame buffer fb1. 

so that we can tie both the displays to two different graphics pipelines and get displays working.

how can we clone the framebuffer0 (fb0) to framebuffer1(fb1) ....?

pls help us in resolving this issue.....

Thank you.