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I have a revC adalm-pluto device. When I examinate the schematic i see there is 5 pl_gpio pin which not connected anywhere. I think that means we can use these pins for custom operations. I cloned the plutosdr-fw repository on my local. I open Vivado project after run make. It seen these pins are in use. 3 of them for axi_spi and 2 of them for iic_main ports. I removed that IPs and conmection and I customized these pins in system_top.v file in hdl/projects/pluto directory. Then I generated and exported bitstream file and make again plutosdr-fw project. It didnt work.

Is this usage legal or not? Why I can not use these pl_gpio pins?