I've been struggling also with all the info in this thread but finally succeeded to make decompile/edit/compile the dtb file (assume this file as BIOS for ARM )
I'm putting all commands here as reference for me as well :
cd /boot/dtb
sudo cp sun8i-h3-orangepi-one.dtb sun8i-h3-orangepi-one.dtb.old
sudo dtc -I dtb -O dts -o sun8i-h3-orangepi-one.dts sun8i-h3-orangepi-one.dtb
sudo sed -i -e 's/dr_mode = "otg";/dr_mode = "host";/g' sun8i-h3-orangepi-one.dts
sudo dtc -I dts -O dtb -o sun8i-h3-orangepi-one.dtb sun8i-h3-orangepi-one.dts
Explanation of different lines:
1. go to dtb directory
2. make backup of the compiled file in case something goes wrong
3. decompile the file to be able to alter it with text editor
4. change the string from "otg" to "host"
5. compile the altered file back to binary format dtb
The only bad thing with all this above is that if you upgrade your kernel the info will be lost so you have to do it again.
I don't get why this parameter is set by default to "otg"?
