Board Support Package (BSP) for Espressif's QEMU emulator: the virtual RGB panel, OpenCores Ethernet and SD card, so espp applications run with no hardware
Boards of ESP-IDF programs described once as data: pins, buses and parts, each fact with where it comes from. The board is chosen once; the component sets its hardware up through the library of each part, and the program asks for what it needs by kind, never by the board's name. A build downloads only the libraries the chosen board needs.