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1. If you want to use UART2, you can map the signals to any GPIO(output available for tx) you want via GPIO matrix.
2. If you have no more GPIO to use, you can also use dual mode flash, and pull up /wp and /hold pin of flash, then sd_d2/sd_d3 can be disconnected with flash and used as GPIO. But this seems not an option on ESP32 module for now.
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