How did you added your script.bin to uboot? I'm trying to change the bootargs parameters but I'm not being able to because all I can see is the boot.img file and I don't know what to do with it. Could you post here your instructions on how you modified uboot please?

Thanks!

As an update, I downloaded the latest official-ROM (nanopi-neo-ubuntu-core-qte-sd4g-20170220.img), not the mainline one, and UART1 works out of the box. It seems that there is really something broken with the mainline image, and I would really like to use it because it is based on a more recent kern...

I just downloaded the recent mainline image for the NanoPi Neo (h3-mainline-ubuntu-core-qte-sd4g-20170228). It boots and runs fine. However, I was trying to access the UART1 on /dev/ttyS1, but apparently it is not enabled by default. The dmesg output is: dmesg | grep tty [ 0.000000] Kernel command l...