The Mambo XiaoXin Robot uses the StarrySky C2-Pico open-source development board as its core controller, paired with ASR-PRO voice recognition module, forming a compact robotic system that integrates motion control, voice interaction, and intelligent response.
The StarrySky C2-Pico board is equipped with the RetroSoC chip independently developed by the ECOS(EDA, Chip, One Student One Chip, System) team. This chip is fabricated using the ICSprout 55 nm open-source PDK process flow and represents a technological achievement that combines the open instruction set RISC-V, open-source EDA, open-source IP, and open-source PDK. Its functionality and performance are benchmarked against the low- to mid-end products of ST’s F1 series.
Internally, the chip integrates the classic lightweight open-source RISC-V processor core PicoRV32, fully implementing the RV32IMC instruction set architecture, with a maximum clock frequency of up to 72 MHz. The chip includes 128 KB of on-chip SRAM, while the board further expands storage with 8 MB PSRAM and 16 MB SPI Flash, forming a multi-level memory system. In addition, the chip integrates a rich set of open-source peripheral drivers, including UART, SPI, I2C, PS/2, PWM, GPIO, timers, and more, meeting diverse embedded development requirements.

The “One Student One Chip” (OSOC) initiative was launched by the University of Chinese Academy of Sciences in 2019. The initiative guides students through designing a RISC-V processor chip from scratch, including tape-out, developing a simple operating system, running it on the chip, running the real game Legend of Sword and Fairy, and completing the physical design process using open-source EDA tools. This enables students to understand the entire processor chip design process. As of February 2026, OSOC enrollments have surpassed 17,000, representing participants from more than 1,200 universities worldwide. This report introduces the implementation of the “One Student One Chip” initiative and the outcomes of open-source chip talent cultivation.

This video documents the unboxing and functional verification process of the StarrySky development board by participants of the “One Student One Chip (OSOC)” Program IV, following the successful tape-out and chip delivery. Featuring a fully customized RISC-V processor core independently developed by the trainees, this self-designed board demonstrates remarkable technical achievements through successful execution of classic games like Mario and rendering of the university's emblem. This helped students strengthen capabilities in hardware–software co-design of computer systems, and cultivated their abilities to understand, build, debug, and optimize complex systems. The student in this video, who is called Tao Zhou, is currently a core technical contributor in the XiangShan frontend team, responsible for the development and performance optimization of the ICache and BPU.