I'm using nanopi-neo-air board and I have patched the Armbian build script for select uart1 as system console.
When I have changed the kernel boot args in boot-sunxi.cmd, script says the:

[ warn ] Can't update since you made changes to: 
config/bootscripts/boot-sunxi.cmd
Press <Ctrl-C> to abort compilation, <Enter> to ignore and continue

How to normal modify config/bootscripts/boot-sunxi.cmd ?
Thank you.

If you can't use /boot/armbianEnv.txt, you might try using customize-image.sh and overlay.  Although, I'd probably just create a patch, git pull/checkout, and reapply patch.

On 7. 3. 2018 at 5:03 PM, spot62 said:

I have patched the Armbian build script for select uart1 as system console

This will not go this simple. You need to dig into u-boot.