PROCESSOR-SDK-AM437X: IDK GPIO pins

I have questions about the 7 industrial inputs available to be used as GPIO input in the AM437x processor kits.

First : Why are the industrial input pins connected to SPI module?

Second:What GPIO ports are these pins connected to? as there is no indication in the data sheet or in the schematics.

Third: If I'm going to use some of them as external interrupts how can that be done when these pins are connected to SPI module and as in question 2 what GPIO ports are these connected to to use the interrupt of that port?

Fourth: Are there any GPIO pins available on the kit besides the 7 industrial pins shown in the schematic?

Thanks in advance.