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How to separate camera.cfg of kernel bbappend file into two conditions? 10/3 Yocto Build Issues AMA

From @MayQueen Technologies: In the camera.cfg of kernel bbappend file, is there a way to separate two conditions where only camera customers need to add this cfg or not? Should I add a new DISTRO variable?

@Ming

Ttechielew From @MayQueen Technologies: In the camera.cfg of kernel bbappend file, is there...

Ming•10/12/24, 1:21 PM

The dfirst thing is to make use of Configuration Fragments. These are files ending in .cfg.cfg that contain fragments of configuration for things like the Kernel. The configuration fragment will be applied to the configuration after the main

.config

.config

file has been applied.
e.g. to enable USB Cameras, you can create a cameras.cfgcameras.cfg file containing:

CONFIG_MEDIA_CAMERA_SUPPORT=y
CONFIG_VIDEO_V4L2_SUBDEV_API=y
ONFIG_V4L2_FWNODE=y
CONFIG_V4L2_ASYNC=y
CONFIG_MEDIA_USB_SUPPORT=y
CONFIG_USB_VIDEO_CLASS=y
CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y

CONFIG_MEDIA_CAMERA_SUPPORT=y
CONFIG_VIDEO_V4L2_SUBDEV_API=y
ONFIG_V4L2_FWNODE=y
CONFIG_V4L2_ASYNC=y
CONFIG_MEDIA_USB_SUPPORT=y
CONFIG_USB_VIDEO_CLASS=y
CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y

Then, you will need an append file in your layer, e.g. layers/project/meta-my_bsp/recipes-kernel/linux-yocto/linux-yocto_%.bbappendlayers/project/meta-my_bsp/recipes-kernel/linux-yocto/linux-yocto_%.bbappend containing

FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"

SRC_URI:append= " file://cameras.cfg"

FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"

SRC_URI:append= " file://cameras.cfg"

Then put the cameras.cfgcameras.cfg in layers/project/meta-my_bsp/recipes-kernel/linux-yocto/linux-yocto/cameras.cfglayers/project/meta-my_bsp/recipes-kernel/linux-yocto/linux-yocto/cameras.cfg

This will get applied to all machines.

If you now have two machines defined, say, my-eyemy-eye that has a camera and my-blindmy-blind , then to configure it so that only my-eyemy-eye picks up the camera configuration, you can change the append file to make use of conditional overridesconditional overrides.

This makes use of the OVERRIDES variable, which by default contains the Architecture, the OS and the Machine name.
The format of an override is
VARIABLE:append:overrideVARIABLE:append:override

So, to only have my-eyemy-eye pick up the camera configuration, the value of SRC_URISRC_URI needs to be
SRC_URI:append:my-eye = " file://cameras.cfg"SRC_URI:append:my-eye = " file://cameras.cfg"

This way the camera.cfgcamera.cfg would only get picked up if the machine my-eyemy-eye is used.

How to separate camera.cfg of kernel bbappend file into two conditions? 10/3 Yocto Build Issues AMA

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