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precompiled-trees/README.md
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Each folder contains a `.dtb` file, which is the compiled device tree itself, plus a `.dts` with the original source and a `.gpio` file showing the GPIO pin mappings.
## Generic
(The generic device tree I will use in my project, suitable for many occasions)[./generic]
[The generic device tree I will use in my project, suitable for many occasions](./generic)
* Has 2x UART (plus the console uart), 2x I2C. 1xSPI
* 12 unassigned GPIO pins
## Serial
(Four UART interfaces *and* Four I2C interfaces)[./serial]
[Four UART interfaces *and* Four I2C interfaces](./serial)
* Has 4x UART (plus the console uart), 4x I2C
* UART3 has RTC/CTS pins available too
* 10 unassigned GPIO pins
## SPI
(SPI plus Serial interfaces)[./spi]
[SPI plus Serial interfaces](./spi)
* Has 3x UART (plus the console uart), 3x I2C. 1xSPI
* 8 unassigned GPIO pins
## SunXI
(Vanilla, unpopulated, upstream)[./sunxi]
[Vanilla, unpopulated, upstream](./sunxi)
* Has the console uart, nothing more
* *26 unassigned GPIO pins!*
## AllWinner Nezha
(DO NOT USE)[./allwinner-nezha]
[DO NOT USE](./allwinner-nezha)
* Included for completeness, this is the default device tree you get with the Ubuntu image.
* Has the console uart, 1x I2C. 1xSPI
* 15 unassigned GPIO pins, 3 pre-assigned to pinctl