Connecting to the Odroid HC4 via UART ===================================== date: 2021-12-30 In the process of trying to flash OpenBSD on my Odroid HC4 (still not achieved.. but the FAQ says the chip is supported...), I needed to connect via the serial console. The board has a UART Console with the following pins: _____UART____ |Pin 4 - GND| |Pin 3 - RXD| |Pin 2 - TXD| |Pin 1 - VCC| \___________| CON5 3.3V LVTTL -> Source: https://wiki.odroid.com/odroid-hc4/hardware/hardware And I have a USB to Serial with the following wires (your colors may vary!): --red----[VCC] --green--[RXD] --white--[TXD] --black--[GND] To the best of my research, these stand for: - VCC: power - RXD: receive - TXD: transmit - GND: ground I had success connecting _without the power_, hooking up only GND, RXD, and TXD. The connectors on my serial are a bit too large, too, so I had to turn them diagonal so the squares would fit in the notches, but it worked! On OpenBSD (host OS), I was able to connect like so: $ doas cu -l cuaU1 -s 115200 (cuaU1 is the serial USB device--not 0 on my machine since my motherboard has its own serial out that takes up cuaU0).