How to unable the UART or serial connection in Armbian OS with Banana Pi Zero ?

Hi All

I am using Banana Pi Zero.

I have installed the Armbian OS in the SD card.

Log In working successfully.

I want to enable the UART in the Banana Pi Zero with Armbian OS.

I want to get the internet connection using GSM module with UART.

If you have any appropriate link for this plz message me.

Command Output:

1.

root@mintboxlite:~# uname -r

3.4.113-sun8i (Kernel Version)

---------------------------------------

2.

root@mintboxlite:~# cat /etc/armbian-release
# PLEASE DO NOT EDIT THIS FILE
BOARD=bananapim2zero
BOARD_NAME="Banana Pi M2 Zero"
BOARDFAMILY=sun8i
VERSION=5.41
LINUXFAMILY=sun8i
BRANCH=default
ARCH=arm
IMAGE_TYPE=user-built
BOARD_TYPE=conf
INITRD_ARCH=arm
KERNEL_IMAGE_TYPE=zImage

--------------------------

3.

root@mintboxlite:~# dmesg | grep tty
[    0.000000] Kernel command line: root=UUID=fa26cc3d-091a-4510-ba3f-f12f36bff240 rootwait rootfstype =ext4 console=tty1 console=ttyS0,115200 hdmi.audio=EDID:0 disp.screen0_output_mode=1920x1080p60 panic=                           10 consoleblank=0 loglevel=1 ubootpart=ce9cea4f-01 ubootsource=mmc usb-storage.quirks=0x2537:0x1066:u, 0x2537:0x1068:u   sunxi_ve_mem_reserve=0 sunxi_g2d_mem_reserve=0 sunxi_fb_mem_reserve=16 cgroup_enable                  =memory swapaccount=1
[    0.000000] console [tty1] enabled
[    0.547802] uart0: ttyS0 at MMIO 0x1c28000 (irq = 32) is a SUNXI
[    0.547987] console [ttyS0] enabled
[    0.548404] uart1: ttyS1 at MMIO 0x1c28400 (irq = 33) is a SUNXI
[    0.548697] uart2: ttyS2 at MMIO 0x1c28800 (irq = 34) is a SUNXI
[    0.548994] uart3: ttyS3 at MMIO 0x1c28c00 (irq = 35) is a SUNXI
[    4.111940] systemd[1]: Expecting device dev-ttyS0.device...
[    5.110580] systemd[1]: Starting system-serial\x2dgetty.slice.
[    5.130252] systemd[1]: Created slice system-serial\x2dgetty.slice.
[    5.130411] systemd[1]: Starting system-getty.slice.
[    5.150169] systemd[1]: Created slice system-getty.slice.
[    7.530201] systemd[1]: Found device /dev/ttyS0.

Can anyone help me.

I have not found any proper documentation for UART and Sim Module Configuration.

Thanks in advance.