Armbian enable UART2 for TX/RX

I'm trying to use the UART1 and UART2 of my device (a NanoPi NEO) to read serial data. So far, UART1 i fully functionnal and I can read and transmit data through /dev/ttyS1. I've enabled UART2 using the armbian-config hardware menu and it seems to have added the line in the armbianEnv.txt: # cat /boot/armbianEnv.txt verbosity=1 bootlogo=false console=serial disp_mode=1920x1080p60 overlay_prefix=sun8i-h3 overlays=uart1 uart2 uart3 rootdev=UUID=f8644502-8a67-43df-8275-2953e5ef9c87 rootfstype=ext4 usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u The config does not seem to be the same for the two UARTs: # cat /proc/tty/driver/serial serinfo:1.0 driver revision: 0: uart:U6_16550A mmio:0x01C28000 irq:137 tx:19080 rx:134 RTS|DTR 1: uart:U6_16550A mmio:0x01C28400 irq:138 tx:0 rx:4312 RTS|CTS|DTR 2: uart:U6_16550A mmio:0x01C28800 irq:139 tx:0 rx:0 CTS 3: uart:U6_16550A mmio:0x01C28C00 irq:140 tx:0 rx:0 RTS|CTS|DTR 4: uart:unknown port:00000000 irq:0 5: uart:unknown port:00000000 irq:0 6: uart:unknown port:00000000 irq:0 7: uart:unknown port:00000000 irq:0 Did I make something wrong or forget to run a command to enable UART2 through /dev/ttyS2 ? I've also tried to add the following line to armbianEnv.txt but didn't help: param_uart2_rtscts=1