Enable Hardware Features
========================

Some boards require some manual configuration to turn on/off certain features

In some cases, the procedure is "less than obvious", so we document some basic examples here.


# H3 based Orange Pi, legacy kernel

## Enable serial /dev/ttyS3 on pins 8 and 10 of the 40 pin header

Update the FEX configuration (which is compiled into a .bin) located at /boot/script.bin

Decompile .bin to .fex
```
cd /boot
bin2fex script.bin > custom.fex
rm script.bin # only removes symbolic link
```

Edit .fex file
```
[uart3]
uart_used = 1 ; Change from 0 to 1
uart_port = 3
uart_type = 2 ; In this case we have a 2 pin UART
uart_tx = port:PA13<3><1><default><default>
uart_rx = port:PA14<3><1><default><default>
```

Compile .fex to .bin
```
fex2bin custom.fex > script.bin
```

Reboot

Notice that /dev/ttyS3 appears. That is your new UART device.

****