The WalnutPi 2B is a compact single-board computer built around Allwinner’s T527 processor, combining an octa-core Cortex-A55 CPU with a modest 2 TOPS NPU in a Raspberry Pi–like form factor. The design focuses on low-cost Linux development, edge experimentation, and light AI workloads.

The WalnutPi 2B is based on the Allwinner T527, an octa-core 64-bit Cortex-A55 processor clocked at up to 1.8 GHz, paired with a 200 MHz RISC-V coprocessor for auxiliary and control tasks.

Graphics are handled by a Mali-G57 MC1 GPU with support for OpenGL ES, OpenCL, and Vulkan, while the integrated NPU delivers up to 2 TOPS of INT8 and FP16 inference performance. A HiFi4 DSP running at up to 600 MHz is also included for audio and signal-processing workloads.

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Memory options include 1 GB, 2 GB, or 4 GB of LPDDR4, with storage provided via optional 32 GB eMMC, an onboard microSD card slot supporting cards up to 512 GB, and an SPI flash device for boot or auxiliary storage.

For higher-performance expansion, the board exposes a PCIe 2.1 x1 interface, which can be used with NVMe SSD expansion boards compatible with the Raspberry Pi ecosystem.

Walnut Pi 2B Bottom View

Connectivity features include Gigabit Ethernet, dual-band Wi-Fi 6, and Bluetooth 5.0 through an onboard wireless module. Video output is provided via a micro-HDMI 2.0a port supporting resolutions up to 4K at 60 fps, alongside MIPI-CSI for camera modules and MIPI-DSI for display panels.

USB connectivity consists of one USB 3.0 port and three USB 2.0 ports, along with a USB Type-C connector used for power input.

Walnut Pi 2B Pinout

Additional interfaces include a 40-pin GPIO header compatible with many Raspberry Pi accessories, UART, I²C, SPI, infrared input, programmable buttons, status LEDs, and optional Power-over-Ethernet support when used with an add-on module.

The board measures approximately 85 × 56 mm and includes a dedicated header for an external cooling fan.

Walnut Pi 2B Top View

The WalnutPi 2B ships with WalnutPi OS, a Debian-based Linux distribution that supports over-the-air updates. Alternative Linux builds without a desktop environment are also available for lighter deployments.

The platform also advertises support for Ubuntu, Android, and Home Assistant images, with development workflows centered on Python, MicroPython, and C or C++.

Specifications listed for the WalnutPi 2B include:

• Processor:
  • Allwinner T527
  • Octa-core Arm Cortex-A55 (64-bit) up to 1.8 GHz
  • 200 MHz RISC-V coprocessor
• Memory:
  • Up to 4 GB LPDDR4
• Storage:
  • MicroSD card slot (supports up to 512 GB)
  • Optional eMMC 5.1 (32 GB standard, other capacities configurable)
  • 8 MB SPI flash
• Display:
  • Micro HDMI 2.0a output up to 4K at 60 fps
  • MIPI-DSI display interface (1-lane, compatible w/ 2-lane)
  • Up to 1080p at 60 fps over MIPI-DSI
• Camera:
  • MIPI-CSI camera interface (1-lane, compatible w/ 2-lane)
• Connectivity:
  • Gigabit Ethernet (10/100/1000 Mbps adaptive)
  • PCIe 2.1 x1 (supports NVMe SSDs)
• Wireless:
  • Dual-band Wi-Fi 6 (2.4 GHz and 5 GHz)
  • Bluetooth 5.0
• USB:
  • 1× USB 3.0
  • 3× USB 2.0
• I/O Interfaces:
  • 40-pin GPIO header (Raspberry Pi compatible)
  • UART debug header
• Other Features:
  • IR receiver
  • Programmable key
  • User LED
• Mechanical:
  • 85 × 56 × 21 mm

Further Information

For reference, the product page notes that the WalnutPi 2B was designed and developed in China, and pricing on AliExpress currently ranges from approximately $77.17 for the base configuration with 1 GB of RAM and no eMMC storage to around $114.51 for higher-end variants equipped with 4 GB of RAM and 32 GB of onboard eMMC.