ecpbreaker: Based on icebreaker FPGA board, upgraded ECP5

Gregory Davill is a technical expert from Australia who is very famous and active in the field of open source hardware. In December 2020, he insisted on designing a circuit board every day, using KiCad to complete the circuit design and PCB layout and routing. This is the adventure-calendar-of-circuits-2020 project.

The icebreaker project is a very nice and handy little board. But it has a small flaw, the ice40 FPGA it uses is very simple, and it's generally fun to see people doing exciting projects with 5k LUTs. Sometimes it's convenient to have some extra space available when experimenting.

  - The board design is based on the original design, simply replacing the fpga with ECP5.  

 - FTDI replaced by Cypress FX2 (using 8051 core)

 - Added SYZYGY port with programmable VIO Please note this will not work "out of the box" like icebreaker, the FX2 USB controller will require firmware to perform JTAG programming. It may also be responsible for SYZYGY VIO configuration.