BIO: The Bao I/O Coprocessor
Summary
BIO is an open source I/O coprocessor in the Baochip-1x that reimagines an I/O co-processor around four RV32E cores with register queues, FIFOs, and a BDMA extension. The post compares BIO to the Raspberry Pi PIO, explains the architecture and memory tradeoffs, and provides practical C and Rust tooling workflows along with code examples. It highlights deterministic real-time IO and potential applications in embedded systems and protocol handling.