Raspi competitor with risc-v: rios picorio in development

Raspi competitor with risc-v: rios picorio in development

Although the open command set architecture has RISC-V already ten years on the hump, there is no cheap system-on-chip (SOC) "Raspberry-Pi class": So with a few Linux-capable CPU cores, a GPU and with controllers for (in this class) current interfaces like USB 3.0 and PCI Express 2.0.

This wants a team from professors and students of the Tsinghua-Berkeley Shenzhen Institute (TBSI) in the project Rios Laboratory: The goal is the raspi-ashal single-board computer "Picorio" With RISC-V-chip. Under the Codename Pygmy, a SOC was designed which manufactures chip-making tiger TSMC with 28-nanometer technology.

Funfkern processor

This Picorio 1.0-Soc For the first version of the Picorio has no graphics processor (GPU), but four Linux-capable RV64GC RISC-V cores and a sparing RV32IMC core for control tasks. As a memory, economical LPDDR4 is provided. In addition, the Rios team has a USB-3.0 controller integrates and gear interfaces such as SPI, I²C and UARTS.

The RV64GC cores were allowed to work with little more than 500 MHz clock frequency as well as 512 kbytes L2 cache significantly slower than the BCM2711 chip of Raspberry Pi 4 (4 × arm Cortex-A72 with 1.5 GHz). Chromeos is planned as an operating system. The RISC-V cores should be thanks to the "J"-Expansion is particularly good for JavaScript and Rios relies on the open JavaScript engine V8-RISCV.

A pre-series version of the PyGMY-SOC allegedly supplies TSMC in the next few weeks. First pattern of Picorio 1.0 should be available in 2020.

Raspi competitor with risc-v: rios picorio in development

The Rios Laboratory wants 2020 first pattern of Picorio 1.Test 0.

View of versions 2.0 and 3.0

For the Picorio 2.0 is an improved SOC version, among other things, provided with a GPU, possibly a PowerVR-GPU of Imagination Technologies: Imagination cooperates with Rios and lays open parts of the in-house GPU technology. The Picorio 2.0 should be suitable thanks to more CPU and GPU performance at least for web applications and also for video. With Picorio 3.0 If the Rios Laboratory then wants to increase the performance so far that the Single Board Computer (SBC) is like using a simple notebook as a simple notebook.

Rios Laboratory stands for RISC-V International Open Source Laboratory. Director is the RISC-V-Zufinder David Patterson, who is now working as a Berkeley professor after his time as a distinguished engineer for Google.

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