Yocto: Difference between revisions
Adds list of notable standard images |
adds section about package groups |
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=== Standard images === | === Standard images === | ||
Images are defined in recipe files. In order to separate them from package recipes, there is a convention to put image recipes into a folder named ''images''. Making use of this, we can list all images defined by all layers via | Images are recipes that ultimately inherit from '''meta/classes/image.bbclass''' and usually add ''packagegroup'' items to the global variable '''IMAGE_INSTALL'''. | ||
Images are defined in recipe files with the file extension 'bb'. In order to separate them from package recipes, there is a convention to put image recipes into a folder named ''images''. Making use of this, we can list all images defined by all layers via | |||
<pre class="terminal"> | <pre class="terminal"> | ||
cd poky | cd poky | ||
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|- | |- | ||
|} | |} | ||
<br /> | |||
== Package Groups == | |||
Package groups are recipes that inherit from '''meta/classes/packagegroup.bbclass''' and set the content of the global variable '''PACKAGES'''. Package groups are defined in recipe files with the file extension 'bb'. | |||
<br /> | |||
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Note that the ''packagegroup'' must be inherited before ''PACKAGES is defined. | |||
<pre class="code"> | |||
inherit packagegroup | |||
PACKAGES = '...' | |||
</pre> | |||
<br /> | |||
== Using devtool == | == Using devtool == | ||
Use '''devtool''' to make changes to an existing recipe and automatically generate an append recipe from those changes. | Use '''devtool''' to make changes to an existing recipe and automatically generate an append recipe from those changes. | ||
Revision as of 2022-11-06T13:58:09
Prerequisites
sudo apt install gcc g++ \ python3-distutils python-is-python3
Images
Standard images
Images are recipes that ultimately inherit from meta/classes/image.bbclass and usually add packagegroup items to the global variable IMAGE_INSTALL.
Images are defined in recipe files with the file extension 'bb'. In order to separate them from package recipes, there is a convention to put image recipes into a folder named images. Making use of this, we can list all images defined by all layers via
cd poky ls meta*/recipes*/images/*.bb
The following standard images are defined in the meta layer:
| core-image-minimal | small image that just boots the target device | |
| core-image-minimal-dev | core-image-minimal with headers and libraries allowing development work | |
| core-image-minimal-initramfs | core-image-minimal with kernel support for in-RAM filesystem | |
| core-image-base | console-only system fully supporting the target hardware | |
| core-image-full-cmdline | console-only image that includes many system tools | |
| core-image-x11 | image with basic X11 and a terminal |
Package Groups
Package groups are recipes that inherit from meta/classes/packagegroup.bbclass and set the content of the global variable PACKAGES. Package groups are defined in recipe files with the file extension 'bb'.
Note that the packagegroup must be inherited before PACKAGES is defined.
inherit packagegroup PACKAGES = '...'
Using devtool
Use devtool to make changes to an existing recipe and automatically generate an append recipe from those changes.