Start with the board, then the architecture
Choose SBC in the board library to combine Raspberry Pi and other single-board computers. Open More filters and choose Architecture to narrow documented ARM, x86 or RISC-V records. Architecture describes the processor ecosystem; it does not determine connector wiring. Records without a verified architecture remain available in the unfiltered library.
LattePanda models stay separate
The collection includes IOTA, Sigma, Alpha, Delta, V1, 3 Delta, Mu and Mu Ultra. Alpha and Delta share a manufacturer diagram with model-specific colors. Mu and Mu Ultra include connector orientation drawings and original signal-definition spreadsheets. An orientation drawing alone does not locate every signal and is not counted as a physical pinout source.
Check the connector scope
A 40-pin GPIO image, such as the Milk-V Mars reference, covers that connector only. It does not document every connector on the computer. Compare physical numbering, signal functions, orientation and electrical limits with the exact model documentation before connecting a peripheral.
Keep specifications close
Board records now expose Specifications & hardware documentation links. A dedicated specification link is distinguished from general source documentation. Missing specifications remain explicit. Source availability does not establish independent electrical testing or complete pin coverage.