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