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28 lines
1.3 KiB
Markdown
28 lines
1.3 KiB
Markdown
# Alternate pre-populated device trees:
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Each folder contains a `.dts` file and a README showing the GPIO pin mappings.
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Copy the desired '.dts' file to the [build-trees](../build-trees) folder and follow the readme there to build the device-tree binaries.
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There are instructions at the end of that document on how you can use a custom 'dtb' and make it permanent across reboots and kernel upgrades.
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The issue with using these trees is that **if** the upstream device tree or includes is modified you need to manually rebuild these trees, and any changes to the upstream <FIX THIS: WHICH IS THE SOURCE??> file need to be detected and applied too.
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- Fortunately this should not be an issue in practice; the kernel *should* remain very stable going forward. Ubuntu 24.04.1 is a LTS release..
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The authors personal advice is to use this only if needed; or as a learning excercise.
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## Common
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[The common (generic) device tree I will use in my project, suitable for many occasions](./common)
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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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[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 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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