60 lines
1.6 KiB
Markdown
60 lines
1.6 KiB
Markdown
Enable Hardware Features
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========================
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Some boards require some manual configuration to turn on/off certain features
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In some cases, the procedure is "less than obvious", so we document some basic examples here.
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# Generic howto for Allwinner devices
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## Legacy or Vanilla kernel ?
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Many Armbian images come in two flavours : Legacy (using an older kernel version) and Vanilla (up-to-date kernel). Depending on kernel version, the procedure to enable/disable features is not the same :
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* Legacy kernel : FEX
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* Vanilla kernel : DT (Device Tree)
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## What flavour am I using ?
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Best way to know is by checking your kernel version :
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```
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root@bananapipro:~# uname -a
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Linux bananapipro 4.5.2-sunxi #11 SMP Thu Apr 28 21:53:25 CEST 2016 armv7l GNU/Linux
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```
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In this example the kernel version is 4.5.2 so you can use DT to tweak some settings. If you get a kernel version 3.X then you'll be certainly using FEX.
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# H3 based Orange Pi, legacy kernel
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## Enable serial /dev/ttyS3 on pins 8 and 10 of the 40 pin header
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Update the FEX configuration (which is compiled into a .bin) located at /boot/script.bin
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Decompile .bin to .fex
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```
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cd /boot
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bin2fex script.bin > custom.fex
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rm script.bin # only removes symbolic link
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```
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Edit .fex file
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```
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[uart3]
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uart_used = 1 ; Change from 0 to 1
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uart_port = 3
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uart_type = 2 ; In this case we have a 2 pin UART
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uart_tx = port:PA13<3><1><default><default>
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uart_rx = port:PA14<3><1><default><default>
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```
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Compile .fex to .bin
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```
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fex2bin custom.fex > script.bin
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```
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Reboot
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Notice that /dev/ttyS3 appears. That is your new UART device.
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****
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