1.3 KiB
Alternate pre-populated device trees:
Each folder contains a .dts file and a README showing the GPIO pin mappings.
Copy the desired '.dts' file to the 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.
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.
- 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
- Has 2x UART (plus the console uart), 2x I2C. 1xSPI
- 12 unassigned GPIO pins
Serial
Four UART interfaces and Four I2C interfaces
- Has 4x UART (plus the console uart), 4x I2C
- UART3 has RTC/CTS pins available too
- 10 unassigned GPIO pins
SPI
- Has 3x UART (plus the console uart), 3x I2C. 1xSPI
- 8 unassigned GPIO pins