I have made some progress on this. It seems that the "Profile" setting in the mux table is daughterboard dependent and left in my BSP from the EVM BSP which used the DIP switches. On my Variscite BSP, only Profile(1) is used. In my confusion I had assumed (yes, I know) that the Profile (0-7) and Mux Mode (0-7) were the same. I found documentation in the AM335x General Purpose EVM HW User Guide to set me straight. The SPI2 function is working now but I'm still not able to configure/toggle GPIO1_21.
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