The screen wrap seems to be an issue with the rev C boards.  I've never 
noticed it with my rev A5C bbb. 
Quickly scrolling up and down a directory listing in mc running in a vc 
causes the screen to often jump back and forth.
As suggested in this ti forum thread, sitara_arm forum 
<http://e2e.ti.com/support/arm/sitara_arm/f/791/p/300197/1052263.aspx>, try 
adjusting the value in the REG_PR_OLD_COUNT register. 
I've found a value below 0x68 works well on mine but I expect it depends on 
what software you have running.


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