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Dear community, I am experimenting with MangoPi board, trying to communicate with the CC2530 Zigbee board . To do so, I need an available UART port, the UART0 (/dev/ttyS0, pins 8 and 10) seems to be occupied by the console, but there should be two other UARTs according to the schematic. Some info: pi@nezha:~$ uname -a Linux nezha 5.19.0-rc1-d1 #trunk Fri Jul 22 12:44:22 MSK 2022 riscv64 riscv64 riscv64 GNU/Linux pi@nezha:~$ setserial -g /dev/ttyS* /dev/ttyS0: Permission denied /dev/ttyS2, UART: unknown, Port: 0x0000, IRQ: 0 /dev/ttyS3, UART: unknown, Port: 0x0000, IRQ: 0 /dev/ttyS4, UART: unknown, Port: 0x0000, IRQ: 0 /dev/ttyS5, UART: unknown, Port: 0x0000, IRQ: 0 pi@nezha:~$ dmesg|grep tty [ 0.000000] Kernel command line: root=UUID=09392a76-5b44-4ed0-b8c1-ea71be0c5a91 console=ttyS0,115200n8 cons ole=tty0 earlycon=sbi cma=96M rootflags=data=writeback rw no_console_suspend consoleblank=0 fsck.fix=yes fsck. repair=yes net.ifnames=0 bootsplash.bootfile=bootsplash.armbian [ 0.022550] printk: console [tty0] enabled [ 0.036087] printk: console [tty0] printing thread started [ 2.054357] printk: console [ttyS0] disabled [ 2.074657] 2500000.serial: ttyS0 at MMIO 0x2500000 (irq = 207, base_baud = 1500000) is a 16550A [ 2.074952] printk: console [ttyS0] enabled [ 2.097185] 2500400.serial: ttyS1 at MMIO 0x2500400 (irq = 208, base_baud = 1500000) is a 16550A [ 2.097219] printk: console [ttyS0] printing thread started [ 2.121099] serial serial0: tty port ttyS1 registered [ 12.144928] systemd[1]: Created slice Slice /system/serial-getty. [ 18.309394] systemd[1]: Found device /dev/ttyS0. pi@nezha:~$ ls -l /boot total 36312 -rwxr-xr-x 1 root root 64 Dec 23 21:18 armbianEnv.txt -rwxr-xr-x 1 root root 38518 Jul 22 10:21 boot.bmp -rwxr-xr-x 1 root root 173018 Jul 22 09:44 config-5.19.0-rc1-d1 drwxr-xr-x 3 root root 4096 Jul 22 10:20 dtb drwxr-xr-x 2 root root 4096 Jul 22 10:19 extlinux -rwxr-xr-x 1 root root 8399919 Jul 22 09:44 Image -rwxr-xr-x 1 root root 5087353 Jul 22 09:44 System.map-5.19.0-rc1-d1 -rwxr-xr-x 1 root root 15056913 Jul 22 10:24 uInitrd -rwxr-xr-x 1 root root 8399919 Jul 22 09:44 vmlinuz-5.19.0-rc1-d1 The usual approach seems to be using the armbian-config utlity, unfortunately, the utility does not allow configuring the hardware in the system branch. How do I enable the UART1? I tried to create the /boot/armbianEnv.txt file as follows: pi@nezha:~$ cat /boot/armbianEnv.txt overlays=uart1 and the /dev/ttyS1 seems to be created (?) but nothing to be seen in /dev/ttyS* pi@nezha:~$ dmesg|grep ttyS1 [ 2.097185] 2500400.serial: ttyS1 at MMIO 0x2500400 (irq = 208, base_baud = 1500000) is a 16550A [ 2.121099] serial serial0: tty port ttyS1 registered pi@nezha:~$ ls -l /dev/ttyS* crw--w---- 1 root tty 4, 64 Dec 23 21:18 /dev/ttyS0 crw-rw---- 1 root dialout 4, 66 Dec 23 21:18 /dev/ttyS2 crw-rw---- 1 root dialout 4, 67 Dec 23 21:18 /dev/ttyS3 crw-rw---- 1 root dialout 4, 68 Dec 23 21:18 /dev/ttyS4 crw-rw---- 1 root dialout 4, 69 Dec 23 21:18 /dev/ttyS5 Can somebody help please? I understand the MangoPi is fairly exotic board, but it's lovely RISC5 and we live in times of silicon shortage, so... In ideal case, I'd like to swap UART0 and UART1 to get my RX/TX on pins 8 and 10, but enabling UART1 will make me happy as well Apologies for the tag, the MangoPi does not seem to be very popular here, yet. Thank you, JP