The D1 is Allwinner’s first SoC based on a RISC-V core design. While the Allwinner D1 isn’t powerful at all, it’s appearance in low-cost boards, RISC-V based design, and the Allwinner development community has made this an attractive entry-level RISC-V target. While various Linux distributions are already supporting D1-based boards, the mainline support for the D1/D1s platform looks like it will finally be merged in 2023.
As one of the last kernel patch series posted for 2022, the v4 revision of the Allwinner D1/D1s platform enablement was posted. This platform enablement has the build configuration updates, new DeviceTree files, and gets features working like USB, Ethernet, and WiFi that have already been worked on and merged as part of prior patches. The Allwinner D1s is very similar to the D1 but has 64MB of memory onboard the package, lacks HDMI output, and drops the DSP.