How do i enable UART 3 in an orange pi 3-LTS. 

 

i checked the /boot/armbianEnv.txt file and it has overlay_prefix=sun50i-h6.  i then did a sudo armbian-config > System > Kernel > SYS210 Manage device tree overlays > enabled sun50i-h6-uart3 > reboot.  

 

after all that i am still only seeing ttys0 when i do a dmesg | grep tty

Have you tried: sudo armbian-config

yes i did a sudo armbian-config

then i selected System 

then i selected Kernel

then i selected SYS210 Manage device tree overlays 

then i enabled sun50i-h6-uart3 

then i rebooted. 

Did you check that the overlay has been added properly to /boot/armbianEnv.txt after using armbian-config? In some situations this fails for a reason still to be determined. Also make sure to apt update&upgrade beforehand since this tool gets patches frequently.

The  /boot/armbianEnv.txt file has overlay_prefix=sun50i-h6 in it.  Is there anything else i need to check to make sure it loaded properly?

 

I have done sudo apt update fallowed by a sudo apt upgrade last week.

i also tried changing overlay_prefix=sun50i-h6 to overlay=sun50i-h6 and it did not help.

 

https://github.com/armbian/configng/issues/360 

In addition to the overlay_prefix what is the value of the overlays parameter in your armbianenv.txt?  Perhaps post your entire armbianenv.txt file

Please look:

 

 

overlay_prefix=sun50i-h6

overlay=uart3

 

 

this is what i currently have in /boot/armbianEnv.txt

 

verbosity=1
bootlogo=true
console=both
disp_mode=1920x1080p60
overlay_prefix=sun50i-h6
rootdev=UUID=07b4bb7c-d23b-458d-b7cc-ede2328d23b0
rootfstype=ext4
overlays=uart3
usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u