D1 is Allwinner-Allwinner’s first SoC based on RISC-V core design, which integrates the 64-bit C906 core of Ali Pingtouge. Allwinner D1s is a lower-level replacement version of the D1 platform. It is also based on C906. D1s has 64 more cores than D1 platform. MB DDR2 memory, but no HDMI output, no DSP, and one less I2S port.

Allwinner D1 has become an attractive entry-level RISC-V board with a low-cost + RISC-V comprehensive design,Various Linux distributions already support D1-based boards (such as Ubuntu officially supports the Allwinner D1 RISC-V development board), but Linux mainline support for D1/D1s platforms has not yet been merged.

At the last minute of 2022, the Linux mainline support patch for the Allwinner D1/D1s platform has released revision v4.This series of patches has updatedbuild configuration,New DeviceTree file, testing and enabling many features simultaneously, including USB, Ethernet, and WiFi.

With this Allwinner D1/D1s platform support patch, DeviceTree can call RISC-V development boards such as ClockworkPi, Dongshan Nezha STU, MangoPi MQ, MangoPi MQ Pro and Sipeed Lichee under the Allwinner D1 SoC platform. Many of these are basic RISC-V boards, which won’t be too powerful in terms of performance, since the D1 SoC itself is a 1GHz single-core RISC-V processor on a 22nm process.

Allwinner D1/D1s platform’s v4 support patch has been fully tested for its functions, including DMIC, Ethernet, LED, MMC, PMIC, touch and USB, etc. The patch email stated that the Allwinner D1/D1s support patch is ready to be merged into the new version, and all that needs to be done now is to wait for the review and merge, and there will be no next version.