Building Images

Setup Build Directory

We provide a script, karo-setup-release.sh, that simplifies the setup for our machines. To use the script, the name of the specific machine to be built for needs to be specified as well as the desired distro. The script sets up a directory and the configuration files for the specified machine and distro. It also adds our layers to the bblayers.conf file.

There are different configurations you can choose from.

• Ka-Ro DISTRO configurations

DISTRO=	Description
karo-minimal	Ka-Ro Linux Distro with minimal read-only rootfs
karo-wayland	Ka-Ro Linux Distro with wayland backend
karo-xwayland	Ka-Ro Linux Distro with xwayland backend

• A list of supported MACHINE configurations

MACHINE=	Description	Supported Baseboards	Display Support	Camera Support
qs8m-mq00	QS8M-MQ00 i.MX8M Mini Solder-in Module	QSBASE 2, QSBASE4	Raspi Display, 10 inch display**, RGB Displays**	Raspi Camera (Sony IMX 219)
qs8m-nd00	QS8M-MQ00 i.MX8M Nano Solder-in Module	QSBASE 2, QSBASE4	Raspi Display, 10 inch display**, RGB Displays**	Raspi Camera (Sony IMX 219)*
qsxm-mm60	QSXM-MM60 i.MX8M Mini Solder-in Module	QSBASE 3, QSBASE4	Raspi Display, 10 inch display**, RGB Displays**	Basler daA2500-60mci
qsxp-ml81	QSXP-ML81 i.MX8M Plus Solder-in Module	QSBASE 3, QSBASE4	Raspi Display, 10 inch display**, RGB Displays**	Basler daA3840-30mc
tx8m-1610	TX8M-1610 i.MX8M Mini CoM	MIPI-MB, MB7	10 inch display
tx8m-1620	TX8M-1620 i.MX8M Mini CoM	LVDS-MB, MB7	10 inch display, MB7-RGB Display
tx8m-nd00	TX8M-ND00 i.MX8M Nano CoM	MIPI-MB, MB7	10 inch display
tx8p-ml81	TX8P-ML81 i.MX8M Plus CoM	LVDS-MB, MB7	10 inch display, MB7-RGB Display
tx8p-ml82	TX8P-ML82 i.MX8M Plus CoM	LVDS-MB, MB7	10 inch display, MB7-RGB Display
qs93-5210	QS93-5210 i.MX93 CoM	QSBASE93	LVDS Displays	imx219 Rpi Camera
tx93-5210	TX93-5210 i.MX93 CoM	LVDS-MB, MB7	LVDS Displays

* = Experimental

** = Additional Hardware Required

Detailed Display Information at Display Guide

Use this command to setup your build directory (specify the distro you want to use, the machine, and the build directory):

• General Example:

DISTRO=<distro> MACHINE=<machine> source karo-setup-release.sh -b <build-dir>

When the script has run, your current directory changes to the <build-dir> you chose before.

• Specific Example (e.g. TX8M-1610):

DISTRO=karo-minimal MACHINE=tx8m-1610 source karo-setup-release.sh -b build-tx8m-1610

• Returning to existing build:

You can return to an already setup build directory by running:

source setup-environment <build-dir>

local.conf

To enable different features for your build you can modify the conf/local.conf file inside your build-directory.

Baseboards

Machine	Supported Baseboards
QS8M	qsbase2 qsbase4
QSXM QSXP	qsbase3 qsbase4
TX8M-1610	mipi-mb mb7
TX8M-1620 TX8P-ML81 TX8P-ML82 TX93-5210	lvds-mb mb7
QS93-5210	qsbase93

WiFi/Bluetooth

For Qsbase3 baseboard there is WiFi and BT support with a Laird WiFi Module.

To enable add the following line to your conf/local.conf [1]

WiFi Only

DISTRO_FEATURES:append = " wifi"`

WiFi and Bluetooth

DISTRO_FEATURES:append = " bluetooth wifi"

Hint

For Bluetooth with the Laird WiFi module it is mandatory to have the WiFi firmware loaded!

Note

How to use WiFi / BT is documented in WiFi/BT Guide.

Raspi Camera

For QS8M on Qsbase2 there is Raspi Camera (Sony IMX 219) support.

To enable add the following line to your conf/local.conf [1]

DISTRO_FEATURES:append = " imx219"

Note

How to use Camera is documented in Camera Guide.

Basler Camera

QSXP and QSXM support a Basler camera.

To build a Yocto Image supporting Basler camera see the Basler Camera section.

Build the Image

Note

The setup-environment provided by the BSP already sets up a SSTATE CACHE to speedup the build process.
For more about sstate caches see Enable sstate cache 1.

Build the image with the following command inside your <build-dir>:

bitbake <image>

Here are the different images you can build:

Image	Description	DISTRO= (required)	Provided by layer
Official Ka-Ro images
karo-image-minimal	Image with minimal read-only rootfs	karo-minimal	meta-karo-distro
karo-image-weston	Image with weston desktop	karo-(x)wayland	meta-karo-distro
karo-image-qt6	QT6 Image on weston desktop. To use it with QT-Creator see QT Guide.	karo-(x)wayland	meta-karo-distro
karo-image-ml	Image including and supporting imx Machine-Learning demos. See Machine Learning Guide.	karo-(x)wayland	meta-karo-distro
karo-image-basler	Image with Basler Camera support on weston desktop. Also including imx Machine-Learning demos. See Basler Camera and Machine Learning Guide.	karo-xwayland	meta-karo-distro
General Yocto / OE images
core-image-minimal	See https://layers.openembedded.org/layerindex/recipe/579/	N/A (any)	Poky
core-image-base	See https://layers.openembedded.org/layerindex/recipe/584/	N/A (any)	Poky
core-image-sato	See https://layers.openembedded.org/layerindex/recipe/658/	N/A (any)	Poky

Getting the SDK

To build the SDK of a certain image run inside your <build-dir>:

bitbake <image> -c populate_sdk

Tip

The SDK can e.g. be used for VS Code Cross-Compilation.

Image Deployment

After a build is complete, the results reside in the tmp/deploy/images sub-directory. An image is, for the most part, specific to the machine set in the environment setup. Each image build usually creates U-Boot, kernel, and an images based on the IMAGE_FSTYPES defined in the machine configuration file.

Usually created files are:

Filename	Content
imx-boot-<machine>.bin-<type>-flash_tx8m	U-Boot flashable binaries
Image	Kernel image
modules-<machine>.tgz	Kernel modules
<image>-<machine>.ext4	.ext4 RootFileSystem
<image>-<machine>.tar.bz2	tar-archived RootFileSystem
*.dtb	Devicetree blob(s)
<image>/	FlashImage standalone folder
<image>/uuu.auto	UUU FlashImage script

Tip

To continue programming your board with these images, simply cd into the above mentioned <image> folder inside deploy folder and run:

uuu -v

For further information about uuu see UUU - Universal Update Utility.

Tip

See what you can do with Yocto built Images at NXP BSP.
If you compiled karo-image-qt6 check out QT Guide.

[1] (1,2)

Always assign DISTRO_FEATURES with the append modifier rather than with += because otherwise the default assignment of the DISTRO_FEATURES variable will be overridden.