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+--- Thread: how to enable Raspberry pi CM4 additional UART serial ports (/showthread.php?tid=4086)
how to enable Raspberry pi CM4 additional UART serial ports - admin - 01-05-2024
edit config.txt file, add:
dtoverlay=uart2
dtoverlay=uart3
dtoverlay=uart4
dtoverlay=uart5
Note that the kernel will reject attempts to enable UARTs where the pins are in use by something else (e.g. UART0, UART1 or one of the I2C ports), or it might even disable the other thing, so make sure what you are trying to do is possible.
uart1 being enabled by default, pi 4 having 4 extra uarts.