XuanTie C906 based Allwinner RISC-V processor to power $12+ Linux SBC’s

Allwinner XuanTie C906 RISC-V Processor

Alibaba unveiled Xuantie-910 RISC-V core (aka XT910) in 2019 for powerful SoC with up to 16 cores, but an update in 2020 revealed the company planned to have a complete RISC-V core family for a wide range of application from low-power microcontrollers to server SoCs.

At the time, I just assumed the company planned to keep their cores to themselves, but time proved me wrong as T-Head, the Alibaba subsidiary in charge of developing RISC-V cores, started to cooperate with Allwinner to develop open-source processors, which should lead to low-cost Linux capable RISC-V SBC very soon according to a tweet from Sipeed.

As far as I understand companies are still under NDA with Allwinner, so they can divulge too much. But here’s what the $12.5 Sipeed Linux RISC-V board specifications should look like based on public information available at this stage:

  • SoC – Unnamed Allwinner single-core XuanTie C906 64-bit RISC-V (RV64GCV) processor @ up to 1 GHz; 22nm manufacturing process
  • GPU – 2D accelerator only (similar to what is found in Allwinner V3s)
  • VPU – H.265/H.264
  • System Memory – 64MB to 256MB DDR3 (built-into processor); external memory version may also be available
  • Storage – MicroSD card socket
  • Video Output / Display I/F – HDMI, RGB LCD
  • Camera I/F – DVP and MIPI CSI
  • Networking – GMAC (Gigabit Ethernet MAC), optional WiFi and Bluetooth module
  • USB – USB host and OTG

I don’t have renders for the SBC, but the company will also make an Allwinner RISC-V system-on-module for other projects.

Allwinner RISC-V SoM
Upcoming Allwinner RISC-V SoM from Sipeed

Allwinner RISC-V processor will run the Debian Linux operating system, and the $12.5 price tag for Sipeed SBC makes it the cheapest RISC-V Linux board with MMU by far. You can already run Linux on RISC-V using Kendryte K210 boards, but those are not really practical due to the lack of MMU and low-memory, or on HiFive Unmatched offered for $665 and allows you to build a complete RISC-V PC.

The upcoming Allwinner powered RISC-V board from Sipeed does not come with a 3D GPU, and memory is limited so based on the information currently available, it may end being comparable to a Raspberry Pi Model A+ minus the ability to run any application relying on 3D graphics.

There’s still a lot of work to bring RISC-V ecosystem to the level of Arm, but it’s clearly a step in the right direction. Sipeed says the board will be available in one or two months, so let’s make that Q1 2021 to take into account potential delays.

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