Serial communication between Jetson nano and Arduino through GPIO

Autonomous Machines Jetson & Embedded Systems Jetson Nano
9

you may access Pinmux spreadsheets for reference.
or,
you could disassembler the dtb file into text file for checking.
for example, $ dtc -I dtb -O dts -o output.txt tegra210-p3448-0002-p3449-0000-b00.dtb

                        uart2_tx_pg0 {
                                nvidia,pins = "uart2_tx_pg0";
                                nvidia,function = "uartb";
...
                        uart2_rx_pg1 {
                                nvidia,pins = "uart2_rx_pg1";
                                nvidia,function = "uartb";