Open-hardware Lattice ECP5 board used for open-source FPGA development, education, LiteX and retro-computing projects.
Short verdict: open-source flow. Critical characteristics must be checked against sources before purchase or external wiring.
Digital video connector x1, SD card x1, USB x1
Expansion headers x1
SDRAM varies by revision
Yosys is an open-source synthesis tool; nextpnr is a portable place-and-route tool supporting several FPGA architectures through device databases.
Start by identifying the ULX3S revision and ECP5 size, then use the documented open ECP5 flow and board-specific constraints.
A RISC-V softcore project needs enough logic, memory, a debug path, firmware build flow and a board-specific memory/IO map.
Linux-capable FPGA projects need a CPU subsystem or large softcore, external memory, storage or boot media, console and a reproducible software build.
