Attached teardown of the NES Classic

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The CPU (Allwinner R16 aka A33) has 5 UART ports.

  • you can also answer your own question, since it turns out you have found that there are at least UART ports. – 0xC0000022L Nov 20 '18 at 9:27

It is UART. As pointed out on this website:

There are PB0/PB1 (for mainline) and PF2/PF4 (for stock firmware) on SIDE-A.

If you want to use the PF2/PF4 pins using the mainline U-Boot, you'll need to change CONS_INDEX to 1, and set UART0_PORT_F in menuconfig.

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