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Owen Carter
2024-08-31 13:34:15 +02:00
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# Alternate pre-populated device trees:
# Alternate device tree Examples:
Each folder contains a `.dts` file and a README showing the GPIO pin mappings.
Copy the desired '.dts' file to the [build-trees](../build-trees) folder and follow the readme there to build the device-tree binaries.
Copy the desired `.dts` file to the [build-trees](../build-trees) folder and follow the readme there to build the device-tree binaries.
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.
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.
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.
The issue with using these trees is that **if** the upstream device tree or includes is modified you need to manually rebuild these trees.
EG any changes to the upstream `sun20i-d1-mangopi-mq-pro.dts` source needs to be detected and applied too. You need to examine file histories to do this.
- 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..
The authors personal advice is to use this only if needed; or as a learning excercise.
## Common
[The common (generic) device tree I will use in my project, suitable for many occasions](./common)
[A common (generic) device tree I, suitable for many occasions](./common)
* Has 2x UART (plus the console uart), 2x I2C. 1xSPI
* 12 unassigned GPIO pins