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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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 Waveshare CM4-DUAL-ETH-BASE is a base board for the Raspberry Pi Compute Module 4. It provides three USB 3.2 Gen1 ports, two Gigabit Ethernet ports (one native to the CM4 and one via a USB Gigabit LAN chip), a wide-range 7–36 V DC power input, plus interfaces for cameras, displays, and cooling.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL19838 WSAL19838 – Dual Gigabit Ethernet Base Board Designed for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL20203 WSAL20203 – Dual Gigabit Ethernet Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Metal Case, with Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL20225 WSAL20225 – Dual Gigabit Ethernet Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Metal Case, with Cooling Fan]

== Technical overview ==
* Compatible with all variants of the Compute Module 4; the socket supports both Lite and eMMC versions.
* Two RJ45 Gigabit ports: ETHERNET 0 uses the CM4's native network port, while ETHERNET 1 is provided through the RTL8153 USB Gigabit LAN chip.
* Three USB 3.2 Gen1 ports for peripheral devices.
* Two HDMI ports supporting 4K@30fps output.
* Dual MIPI CSI camera connectors (CAM0/CAM1) and a MIPI DSI display connector (DISP1).
* Wide-range DC power input from 7 to 36 V; at least 18 W is recommended for normal CM4 operation.
* Fan header with an EMC2301 controller for speed regulation and measurement.
* RTC connector (PCF85063A) on I²C bus 10 at address 0x51; the fan controller shares that bus at address 0x2f.
* Jumper switches to disable Bluetooth/WiFi, select boot mode (without eMMC or TF), and choose logic voltage (3.3 V or 1.8 V).
* Versions: V1 (initial), V2 (20220518, DSI changed from DSI0 to DSI1), V3 (20220527, added common-mode inductors for EMI improvement, CE certified).

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo nano /boot/config.txt
dtparam=i2c_vc=on
dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
#dtparam=audio=on
sudo reboot
sudo hwclock -w
sudo hwclock -s
sudo hwclock --set --date="9/8/2021 16:45:05"
sudo hwclock -r
sudo hwclock --verbose
uname --all
dtoverlay=i2c-fan,emc2301,i2c_csi_dsi,midtemp=45000,maxtemp=65000
i2cdetect -y 10
libcamera-hello --list-cameras
libcamera-hello -t 0
libcamera-jpeg -o test.jpg
libcamera-vid -t 10000 -o test.h264
libcamera-hello --camera 1
libcamera-hello --camera 0
reboot
</syntaxhighlight>

== Notes and version constraints ==
* Plugging or unplugging any device other than USB and HDMI is prohibited while powered on.
* Before connecting a fan, confirm its rated voltage matches the connected voltage; default is 12 V (resistor FAN_VCC must be re-soldered when switching to 5 V).
* The Type-C port is only a USB slave for flashing images and must not be used as a power source; no other devices may be connected during image writing.
* This expansion board does not support PoE.
* When using the RTC, DSI and CSI interfaces are disabled.
* All config.txt changes require a reboot to take effect.
* If the fan does not spin after adding the driver: check kernel version (at least 6.1.31); older kernels will not work.
* If the RTC value is inaccurate or invalid: verify the CR1220 battery connection and voltage.
* HDMI output: With a DSI display connected, HDMI is disabled; plugging into either HDMI port restores output, but with two monitors only HDMI0 produces an image.

== Source and revision record ==
* [https://www.waveshare.com/wiki/CM4-DUAL-ETH-BASE CM4-DUAL-ETH-BASE - Waveshare Wiki]
* Source revision: 88341
* Captured: 2026-09-02T02:56:55+00:00
* SHA-256: <code>e958e6d5e3a8424284af683335f84d9b84fdfd0e972a564803036c7b57793223</code>

WSAL19838 – CM4-DUAL-ETH-BASE/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex