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The Raspberry Pi 1, 2, 3 and Pi Zero / Zero W all have two UARTs (PL011 + mini UART). The Raspberry Pi 4 and 400 have six UARTs (5 x PL011 + mini UART). This is from the official documentation.

I have been unable to find information about the Raspberry Pi Zero 2 W. There is however a difference between Zero W (Buster) versus Zero 2 W (Bullseye) when I run dtoverlay.

pi@rpi-zero-w:~ $ dtoverlay -a | grep uart midi-uart0 midi-uart1 miniuart-bt uart0 uart1 uart2 uart3 uart4 uart5 
pi@rpi-zero-2-w:~ $ dtoverlay -a | grep uart midi-uart0 midi-uart1 midi-uart2 midi-uart3 midi-uart4 midi-uart5 miniuart-bt qca7000-uart0 uart0 uart1 uart2 uart3 uart4 uart5

Does this mean that the Zero 2 W also has 6 UARTs? Can I map some of these out to GPIO pins?

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The Pi Zero2 W has the same BCM2710A1 SOC as the Pi3 and all pre Pi4 models have the same peripheral implementation, so the same UART.

dtoverlay -a lists all defined device-tree overlays, but none of these are loaded.

In my experience dtoverlay -l doesn't show any loaded, even though I have a few.

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