Jim Kleiner created a minimal FPGA cape for the BeagleBone Black: BBB LX9 FPGA Board Jim describes his design decisions: I decided to try a minimalist hand solderable FPGA board. The LX9 is the largest part available in a TQG-144, beyond that its BGAs One of the key points is that the SPI interface is on BBB […]
via FPGA cape for BeagleBone Black — BeagleBoard.org Blog
KiCad design files are available on GitHub:
BREC_3/Boards/Fboard
KD2BOA has shared the board on OSH Park:
OSH Park 
KiCad files are available at:
https://github.com/drone32768/BREC/tree/master/BREC_3/Boards/Fboard
The OSH Park project is also shared at:
https://oshpark.com/profiles/KD2BOA
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