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OCTVO-3P-AM335X: Using SysConfig, unable to select pins as they are defined in datasheet.

Part Number: OCTVO-3P-AM335X
Other Parts Discussed in Thread: SYSCONFIG

Using SysConfig 1.9.0+2015, I want to pick pin A15 for SPI1_CS1.  It shows it as valid here, and in the datasheet:

Yet it will not allow it when I pick it here:

The same thing is happening for SPI1_SCLK:

Please let me know if I can use this pins as they are defined in the datasheet.  Thank you.