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WSAL22360 – CM4-DUAL-ETH-MINI/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The CM4-DUAL-ETH-MINI is a baseboard for the Raspberry Pi Compute Module 4. It provides two gigabit Ethernet ports, one USB 2.0 port, a fan interface and a standard Raspberry Pi 40-pin GPIO header. The board is powered via a 5 V DC Type-C connector.

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Technical overview

  • Two RJ45 gigabit Ethernet ports: ETHERNET 0 uses the CM4's built-in network port; ETHERNET 1 is a PCIe expansion network port using the RTL8111H chip.
  • The 40-pin GPIO header is for connecting various HAT modules.
  • The Type-C connector can serve as a 5 V/2.5 A power supply or as an eMMC programming interface; the BOOT switch selects between USB Type-C (ON) and eMMC/Micro SD (OFF).
  • A 5 V four-wire fan connector (SH1.0, 4P) supports speed measurement and regulation; only 5 V fans are supported.
  • The micro SD card slot allows booting the Compute Module 4 Lite from a micro SD card.
  • The SYSTEM switch controls EEPROM_WP (prevents EEPROM overwrite), WiFi_DIS and BT_DIS (relevant only for CM4 versions with antenna).
  • PWR and SYS LEDs indicate power status and operating status respectively.
  • USB 2.0 is disabled by default; enable it by adding 'dtoverlay=dwc2, dr_mode=host' to config.txt.
  • Operating temperature range: -10 to 75 °C.

Commands and examples – verify before use:  

sudo apt-get update && sudo apt-get install python-pip && sudo pip install RPi.GPIO
wget https://files.waveshare.com/upload/e/ee/CM4-DUAL-ETH-MINI-Example.zip && unzip CM4-DUAL-ETH-MINI-Example.zip -d ./CM4-DUAL-ETH-MINI-Example
python main.py  # oder python3 main.py im Ordner CM4-DUAL-ETH-MINI-Example/FAN
sudo nano /etc/rc.local  # Zeile 'python ../main.py' vor 'exit 0' einfügen für Autostart
sudo apt update && sudo apt upgrade  # falls die Netzwerkkarte nicht gefunden wird
cd CM4-DUAL-ETH-MINI-Example/Driver && tar vjxf r8168-8.050.03.tar.bz2 && cd r8168-8.050.03 && sudo ./autorun.sh

Notes and version constraints

  • Do not confuse: The source text contains placeholders such as {{{name3}}} and {{{userDefinedInfo}}}; these were ignored.
  • No PoE support on this expansion board.
  • When programming the image via the Type-C connector, do not connect other devices to ensure proper CM4 power supply.
  • When using OpenWrt, no technical support is provided outside of hardware; only tutorials and images are available.
  • If the I2C address of the RTC/fan controller cannot be found: check whether 'dtparam audio on' is blocked in /boot/config.txt and whether /boot/dt-blob.bin exists.
  • When compiling the kernel, the driver kmod-r8169 must be added for the network card.
  • Instructions in the source material apply only to the described hardware; other versions may differ.

Source and revision record

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