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kas: split into unique files and add testimage

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Refactor the existing kas configuration by splitting it into a shared
base.yml and a set of per-machine include files. This allows for easier
usage and potential CI use cases.

Also, change the readme to reflect the new changes.

Signed-off-by: Jon Mason <jon.mason@arm.com>
This commit is contained in:
Jon Mason authored and Khem Raj committed 2026-10-13 19:30:08 -07:00
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README.md
+33 -10
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@@ -76,14 +76,31 @@ This layer depends on:
## Quick Start with kas
1. Install kas build tool from PyPi (sudo pip3 install kas)
2. Set the `machine: ` in kas-poky-rpi.yml to one of the supported boards (see conf/machine/*.conf)
3. kas build meta-raspberrypi/kas-poky-rpi.yml
4. Use bmaptool to copy the generated .wic.bz2 file to the SD card
5. Boot your RPI
1. Install the kas build tool from PyPI:
To adjust the build configuration with specific options (I2C, SPI, ...), simply add
a section as follows:
```
pip3 install kas
```
2. Select the appropriate machine configuration file from `kas/`
(for example `raspberrypi4.yml`, `raspberrypi3-64.yml`, etc.)
3. Run the build:
```
kas build meta-raspberrypi/kas/<machine>.yml
```
4. Use `bmaptool` to copy the generated `.wic.bz2` image to the SD card
5. Boot your Raspberry Pi
The kas configuration is split into a shared `base.yml` and per-machine
configuration files. Machine selection is done by choosing the appropriate
kas file rather than editing a `machine` variable.
To adjust the build configuration with specific options (I2C, SPI, etc.),
extend the configuration by adding a `local_conf_header` section, for example:
```
local_conf_header:
@@ -92,10 +109,16 @@ local_conf_header:
RPI_EXTRA_CONFIG = "dtoverlay=disable-bt"
```
To configure the machine, you have to update the `machine` variable.
And the same for the `distro`.
Additional configurations can be layered by including extra kas files. For example,
to enable runtime testing with `testimage`:
```
kas build meta-raspberrypi/kas/raspberrypi4.yml:meta-raspberrypi/kas/testimage.yml
```
For further details, see the kas documentation:
https://kas.readthedocs.io/en/latest/index.html
For further information, you can read more at <https://kas.readthedocs.io/en/latest/index.html>
## Contributing