K3 Platform Software Development

This page collects the official SpacemiT documentation links for K3 platform software development, covering the SDK, Linux kernel / U-Boot / OpenSBI compilation, root filesystem (ROOTFS) creation, image download & flashing, and the full workflow for deploying an x86-trained model to K3.

Portals

• Documentation Center
• Resources Download
• Developer Center
• K3 Product

K3 SDK & System

• K3 SDK Overview
• Bianbu Introduction
• Bianbu Images
• Buildroot K3 Introduction
• Buildroot K3 Source Code
• Buildroot K3 Images

Kernel / U-Boot / OpenSBI Compilation

• Kernel Compile (incl. U-Boot / OpenSBI)
• Cross-Compilation Toolchain Guide
• Buildroot K3 Boot Development
• Peripheral Driver Development

RootFS Download & Creation

• Bianbu 4.0 ROOTFS Creation (K3)
• Image (Firmware) Creation

Official base ROOTFS download (Bianbu 4.0 / K3):

https://archive.spacemit.com/bianbu-base/bianbu-base-26.04-base-riscv64.tar.gz

Image Download & Flashing

• K3 Bianbu Image
• K3 Buildroot Image
• Flashing Tool Manual
• K3 Pico-ITX User Guide

AI Model Deployment

• SpacemiT-ONNXRuntime (inference)
• XSlim Quantization Tool
• llama.cpp (LLM deployment)
• AI SDK (Vision / Speech / LLM / VLM)
• ONNX Model Deployment Guide

Official Source Repositories

• SDK manifest
• Linux kernel linux-6.18 (branch k3-br-v1.0.y)
• U-Boot uboot-2022.10
• OpenSBI
• Buildroot
• Cross-compilation toolchain
• XSlim quantization
• ONNXRuntime