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by bofh23 1713 days ago
No need to give up a PCIe slot. The Raspberry Pi Zero and the RPi 4 have USB On-The-Go support so they can appear to be a serial port, Ethernet port, or other types of devices using the Linux USB Gadget API. It’s even possible to appear as multiple device types at once.

Overview | Turning your Raspberry Pi Zero into a USB Gadget | Adafruit Learning System https://learn.adafruit.com/turning-your-raspberry-pi-zero-in...