[ Also available at https://lucasteske.dev/2020/06/hacking-a-esp32-into-fpga-board ] Last year I saw a russian guy that found out that this cheap board (US$15~) had an Lattice ECP5 FPGA, which is compatible with Open Source Tool-chains for synthesis. He was running a RISC-V Core inside that and piping the serial through the ethernet…