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Embedded Linux Development Using Yocto Project

Embedded Linux Development Using Yocto Project

By : Otavio Salvador, Angolini
5 (9)
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Embedded Linux Development Using Yocto Project

Embedded Linux Development Using Yocto Project

5 (9)
By: Otavio Salvador, Angolini

Overview of this book

The Yocto Project is the industry standard for developing dependable embedded Linux projects. It stands out from other frameworks by offering time-efficient development with enhanced reliability and robustness. With Embedded Linux Development Using Yocto Project, you’ll acquire an understanding of Yocto Project tools, helping you perform different Linux-based tasks. You’ll gain a deep understanding of Poky and BitBake, explore practical use cases for building a Linux subsystem project, employ Yocto Project tools available for embedded Linux, and uncover the secrets of SDK, recipe tool, and others. This new edition is aligned with the latest long-term support release of the aforementioned technologies and introduces two new chapters, covering optimal emulation in QEMU for faster product development and best practices. By the end of this book, you’ll be well-equipped to generate and run an image for real hardware boards. You’ll gain hands-on experience in building efficient Linux systems using the Yocto Project.
Table of Contents (20 chapters)
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Debugging metadata variables

To debug the metadata variables, we can use the bitbake-getvar script. It uses the BitBake internal data to get a specific variable value and its attribution history.

For example, to inspect the PACKAGECONFIG variable for the procps recipe, we can use the following command:

Figure 10.7 – The result of bitbake-getvar -r procps PACKAGECONFIG

Figure 10.7 – The result of bitbake-getvar -r procps PACKAGECONFIG

From Figure 10.7, we can see that PACKAGECONFIG at the end is empty. We can also see that defaultval was set to "${@bb.utils.filter('DISTRO_FEATURES', 'systemd', d)}" at line 33 from the meta/recipes-extended/procps/procps_3.3.17.bb file.

We can see the procps recipe lines 33 and 34 in the following screenshot:

Figure 10.8 - The procps recipe 33 and 34 lines

Figure 10.8 - The procps recipe 33 and 34 lines

The bitbake-getvar script can be used to check whether a feature is enabled or to be sure a variable has been expanded as we expect.

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