SpacemiT August 2026 Upstream Progress: Triton, Kernel, and Toolchain Advances

AI Software Stack Upstream

August brought significant progress on SpacemiT's AI software stack:

Triton Backend Merged into FlagTree

The SpacemiT Triton backend has been merged into the FlagTree main branch under the third_party/spacemit directory. This enables Triton language execution on SpacemiT hardware, opening the door for GPU-like kernel programming patterns on RISC-V AI processors. The Triton compiler generates code that can leverage the K1's IME (Intelligent Matrix Extension) and the K3's more advanced compute units.

Source: FlagTree PR #933 llama.cpp Gains Qwen3-ASR Multi-Request Support

SpacemiT's fork of llama.cpp now supports multi-request speech recognition via Qwen3-ASR. The llama-server provides an OpenAI-compatible API interface, supporting concurrent audio encoding/decoding, continuous batching, and dynamic scheduling. This is particularly relevant for the K1 (2 TOPS) and K3 (60 TOPS) platforms, enabling real-time speech-to-text pipelines on RISC-V hardware.

Source: SpacemiT llama.cpp

Linux Kernel Upstream

K1 Patches

Merged:

• Milk-V Jupiter CPU scaling patches
• K1 dev board CPU core maximum voltage fix
• K1 thermal shutdown and registration order fix (merged into thermal tree)

Under Review:

• K1 three dev board CPU scaling
• K1 USB2 PHY Kconfig fix and default enable
• RISC-V defconfig: enable DWC3 and K1 thermal sensor

These kernel patches matter for anyone running OpenWrt or Bianbu Linux on K1-based boards like the Orange Pi RV2, Milk-V Jupiter, or Bit-Brick Cluster. The thermal and CPU voltage fixes are especially relevant for long-term stability in embedded gateway deployments.

K3 Patches

Merged:

• K3 Ethernet PHY dtschema fix
• K3 I2S controller DTS nodes
• K3 USB controller and USB PHY nodes
• K3 I2S clock topology and divider fix
• SpacemiT pinctrl pinconf parameter validation
• SpacemiT ASoC redundant error log cleanup
• SpacemiT K1/K3 I2S MAINTAINERS entries
• SpacemiT RTC regmap_test_bits error handling

Under Review:

• K3 PCIe device node
• OrangePi RV2 DTS node sorting
• Sensylink CTF2301 and K3 CoM260 support
• K3 UFS host controller support
• K3 display support
• K3 PLL5/PLL8 1.8 GHz rates
• RVA23U64 hwprobe and K1/K3 Zic64b
• K3 Pico-ITX Bluetooth and WiFi support
• K3 clock and reset support

The volume of K3 patches under review signals that mainline K3 support is approaching a usable state. The PCIe, UFS, and display nodes are critical for the K3 to function as a full desktop replacement or AI inference station.

Toolchain Upstream

box64 (RV64 Emulator)

Over 30 fixes and optimizations were merged in August, focused on:

• RV64_DYNAREC: Fixed HADDPS NaN handling, RDTSC/RDTSCP, ROUNDPD qNaN processing, ANDN/BZHI opcode errors, and added support for VMOVDQU, ADCX, VBROADCAST, VMOVMSKPS, PHSUBD/PEXTRB, VPBROADCAST opcodes
• WRAPPER: Fixed strlcat/strcpy boundary issues, use-after-free (issue #4214), and added support for libopus.so, gnutls symbols, and GLib vprintf wrappers
• ELFLOADER: Fixed numDynamic typo and added versioned data symbols support
• SYSCALL: Aligned io_uring epoll events

box64 is essential for running x86_64 binaries on RISC-V, bridging the software gap while native RISC-V ports mature.

riscv-gnu-toolchain

• Enabled LLVM Polly
• Introduced LLVM_ASMFLAGS_FOR_TARGET
• Upgraded GDB to 17.2-release
• Upgraded glibc to 2.44
• CI: Applied Flang compilation to all OS versions

OpenSBI

SpacemiT K3 platform support updated to v3, addressing expected-trap, hart init, and RV64-only build feedback from v2 review. This is a critical piece for K3's S-mode firmware.

Source: OpenSBI K3 v3

V8 (JavaScript Engine)

Multiple RISC-V fixes merged: AtomicStore fence ordering, register usage issues, Smi int32 checks under pointer compression, and Liftoff constant storage by value width.

What This Means for RISC-V Developers

The August upstream progress shows SpacemiT's commitment to mainline Linux and open-source tooling. For developers:

• K1 users can expect better thermal management and USB2 PHY stability in upcoming kernel releases
• K3 users should watch the PCIe, UFS, and display patches -- once merged, K3 will have near-complete mainline support
• AI developers gain Triton programming support and multi-request ASR via llama.cpp
• Toolchain users benefit from glibc 2.44, GDB 17.2, and the 30+ box64 fixes

For those building products on these platforms, we recommend tracking the lore.kernel.org patches and testing with Bianbu 4.x releases, which incorporate many of these upstream changes ahead of mainline.

Hardware Availability

The SpacemiT K1 (8-core X60 at 1.6 GHz, 50K DMIPS, 2 TOPS AI) is available in several form factors including the MUSE Pi Pro and Orange Pi RV2. The K3 (8-core X100 at 2.4 GHz + 8 A100 AI cores = 60 TOPS) is available on the CoM260 and Pico-ITX boards.

For WCH RISC-V MCUs, the CH32V003 ($0.1, RV32EC, 48MHz) remains the lowest-cost entry point, while the CH32V307 ($3, gigabit Ethernet MAC) and CH32V317 ($4, 480Mbps USB) serve connectivity-focused applications. Source: SpacemiT Forum - Upstream Progress August 2026 Source: SpacemiT Forum - K1 IME Matrix Extension