--- title: "W5500-EVB-PICO2上のFuzixでEthernetに接続する話" url: "https://maker.wiznet.io/matthew/projects/w5500-evb-pico2fuzixethernet/" markdown_url: "https://maker.wiznet.io/matthew/projects/w5500-evb-pico2fuzixethernet/md" type: "UCC: User Created Content" author: "kazueda" author_url: "https://zenn.dev/kazueda/articles/b959e61dfe4c25" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "kazueda" original_url: "https://zenn.dev/kazueda/articles/b959e61dfe4c25" published: "2025-09-24" language: "en" tags: ["W5500", "Raspberry Pi"] likes: 0 views: 2872 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # W5500-EVB-PICO2上のFuzixでEthernetに接続する話 > Fuzix on W5500-EVB-PICO2: apply rpipico+W5500 patches, set IP in hex, build/flash, and verify networking with ifconfig, telnet, and htget. Original author: kazueda (source: https://zenn.dev/kazueda/articles/b959e61dfe4c25) ## Article ## Overview This tutorial shows how to run **Fuzix** (a Unix-like OS for constrained systems) on **W5500-EVB-PICO2**—a board that integrates **RP2350** and **WIZnet W5500**—and bring it **online via Ethernet**. Unlike earlier Pico setups that needed jumper-wire SPI wiring to a W5500 module, EVB-PICO2 routes **W5500↔RP2350 over on-board SPI**, eliminating wiring and letting you focus on kernel/driver work, static IP configuration, build/flash, and verification with `**ifconfig**`** / **`**telnet**`** / **`**htget**`. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) --- ## Original Language & Author Originally published in **Japanese** on **Zenn** (Dec 17, 2024) as part of the *Raspberry Pi Advent Calendar 2024*. The author, **kazueda**, is a maker who “loves 8-bit CPUs/MCUs.” This article follows an earlier post on booting Fuzix on W5500-EVB-PICO2/Pico2 and now focuses on **enabling Ethernet**. The board used was provided by the **Japanese Raspberry Pi User Group**. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) --- ## Key Highlights **Context: Fuzix + W5x00 Ethernet lineage** The article surveys prior Fuzix+Ethernet examples (Z80 SC111, Raspberry Pi Pico, ESP8266) and contrasts them with EVB-PICO2’s no-wiring SPI path to W5500. Reference links include Z80 on the internet, a Pico+Fuzix+W5500 guide, and the Fuzix ESP8266 platform notes. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Patch base for rpipico + W5500** Because the Pico/Pico2 repos lack W5500 bits, the author points to `**wiznetmaker/FUZIX**`** → **`**rpipico-eth-w5500**` and its “3 commits ahead” changes: **7 files modified** and **2 files added** (`wiznet.c` / `wiznet.h`). Apply these into `**Kernel/platform-rpipico**`. A note mentions the overclock Makefile option isn’t reflected yet. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Static network parameters (hex, big-endian)** In `**Kernel/dev/net_w5x00.c**`, inside `netdev_init()`, set IP/Gateway/Mask as **hex constants** (e.g., `0xC0A80001` → 192.168.0.1; `0xC0A800FE` → 192.168.0.254; `0xFFFFFF00` → 255.255.255.0). The author recommends using an IP↔hex converter. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Build / flash / verify** Build Fuzix with the patched `platform-rpipico`, flash to EVB-PICO2, then verify with `ifconfig` and simple connectivity checks: `**telnet**` to a server and `**htget**` from a web server. Tools are text-based, but they confirm the network stack is alive. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Hardware noteW5500-EVB-PICO2** (RP2350 + W5500) is linked as the target product; SPI between RP2350 and W5500 is on-board (no jumper wires). ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) --- ## Why It Matters (Curator’s View) **Zero-wiring network bring-up**: EVB-PICO2 removes wiring variables and lets learners focus on **OS porting, driver integration, and network parameterization**—the real educational value. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **“Small-Unix” on microcontrollers**: Fuzix exposes the full stack—kernel, driver, and userland—so you practice **reading → patching → rebuilding → validating** with concrete files (e.g., `wiznet.c/h`, `net_w5x00.c`). ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Protocol literacy**: Manually encoding IP/GW/MASK in hex (endian awareness) builds intuition you will reuse in embedded networking and bare-metal bring-up. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) --- ## Quick Reproduce (Checklist) **Prep**: Set up the Fuzix build environment from the prior article (booting Fuzix on EVB-PICO2/Pico2). ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Patch**: From `wiznetmaker/FUZIX` `**rpipico-eth-w5500**`, apply the **7 mods + 2 adds** into `Kernel/platform-rpipico` and include `**wiznet.c**`** / **`**wiznet.h**`. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Network params**: In `Kernel/dev/net_w5x00.c`, set IP/GW/MASK hex constants for your LAN. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Build & flash**: Build Fuzix and flash to **W5500-EVB-PICO2** (RP2350 + W5500 SPI is on-board). ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Verify**: Boot → `ifconfig` → `**telnet**` to a server → `**htget**` a file from a web server. ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) --- ## References **Original (Japanese)**: Zenn — *W5500-EVB-PICO2上のFuzixでEthernetに接続する話* (Dec 17, 2024). ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Prior article (booting)**: *W5500-EVB-PICO2やRaspberry Pi Pico2でFuzixを起動する話.* ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Product**: WIZnet — *W5500-EVB-PICO2* (RP2350 + W5500). ([Zenn](https://zenn.dev/kazueda/articles/b959e61dfe4c25)) **Related examples**: Z80 on the Internet; Pico+Fuzix+W5500 how-to; Fuzix ESP8266 platform --- Source: https://maker.wiznet.io/matthew/projects/w5500-evb-pico2fuzixethernet/