Hardknott

1 Yocto Images
2 Setting up Hardknott
- 2.1 Getting Hardknott
  - 2.1.1 Example
- 2.2 Creating the build-tree
  - 2.2.1 Example
  - 2.2.2 Example
3 Building an image
4 Deploying an image
5 Kernel and bootloader

Yocto Images

Date	Description	Download

Date	Description	Download
17.09.2021	Yocto Hardknott with 5.10.9 kernel, weston and chromium	tr8mini-ipant7-yocto_hardknott_weston_chromium-20210917.imz, tr8mini-sbcsom-yocto_hardknott_weston_chromium-20210917.imz
07.06.2022	Yocto Hardknott with kernel 5.10.9 for Trizeps8plus, weston, Qt5, several demos by NXP and device trees for several baseboards and displays	tr8plus-yocto_hardknott_full-20220607.imz
28.09.2022	Yocto Hardknott with 5.10.9 kernel, weston and chromium for iPanT7 V2	tr8mini-ipant7-yocto_hardknott_weston_chromium-20220928.imz

Setting up Hardknott

Getting Hardknott

First you have to fetch Hardknott:

$ mkdir <yocto-root>
$ cd <yocto-root>
$ repo init -u https://source.codeaurora.org/external/imx/imx-manifest  -b imx-linux-hardknott -m imx-5.10.35-2.0.0.xml
$ repo sync

Example

$ mkdir imx-linux-hardknott
$ cd imx-linux-hardknott
$ repo init -u https://source.codeaurora.org/external/imx/imx-manifest  -b imx-linux-hardknott -m imx-5.10.35-2.0.0.xml
$ repo sync

This will download Hardknott to the directory imx-linux-hardknott. All recipes and config files will be stored under the subdirectory sources.

Creating the build-tree

Next you have to create a directory structure for your build:

$ MACHINE=<machine> DISTRO=<distro> ./imx-setup-release.sh -b <build-tree>

Example

This will create a buid-tree for the machine imx8mm-lpddr4-evk and the distro fsl-imx-xwayland in the subdirectory build-xwayland. It will also setup the environment for your build. You can setup the environment any time without creating the whole directory-structure by:

Example

Machines are defined in configuration files named <machine>.conf inside directories named conf/machine of some layers. To find out wich machines are supported you can do:

Also distros are defined in subdirectories named conf/distro of some layers. To find out which distros are available do:

Building an image

To build an image enter the Yocto-directory, setup the environtent and start bitbake with the basename of the image-recipe to build:

This will build the image imx-image-multimedia of the distro build-xwayland for the machine imx8mm-lpddr4-evk as previously configured.

You can also make bitbake execute a single task of a recipe:

To find out wich tasks are provided by a recipe do:

Deploying an image

Unlike previous Yocto versions images are not longer written to raw image files, intended to be written to the target device by dd or something similar, but to container files in wic-format which are bz2 compressed. To create and manipulate these files and write them to a target device, there is a Yocto-provided tool called wic. The syntax of wic is:

The most importand command of wic is:

wic is neither able to read bz2 or otherwise compressed files, nor to read from stdin, so you have to decompress an image file before you can write it to a device using wic:

Kernel and bootloader

There are currently no Yocto recipes for Hardknott to provide kernel and bootloaders by Seco. The kernel and bootloader in the image are those by NXP. To equip your images with Seco kernel and boodloader refer to Patch Image with Seco Linux Bootloader and Kernel.