There is a PinMux utility available on the TI wiki:
http://wiki.davincidsp.com/index.php?title=Image:DaVinci_Pinmux_v02.zip#file
Why is there a warning about it containing malicious code?
DaVinci_Pinmux_v02.zip (file size: 386 KB, MIME type: application/zip)
DM644x Pinmux Utility.