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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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Explaining package versioning

Package versioning is used to differentiate the same package in distinct stages of its life cycle. From Poky’s perspective, it is also used as part of the equation that generates the checksum used by BitBake to verify whether a task must be rebuilt.

The package version, also known as PV, plays a leading role when we select which recipe to build. The default behavior of Poky is always to prefer the newest recipe version unless there is a different explicit preference, as discussed in Chapter 5, Grasping the BitBake Tool. For example, let’s suppose that we have two versions of the myrecipe recipe:

  • myrecipe_1.0.bb
  • myrecipe_1.1.bb

BitBake, by default, builds the recipe with version 1.1. Inside the recipe, we may have other variables that compose package versioning with the PV variable. These are the package epoch, known as PE, and the package revision, known as PR.

Those variables normally follow this pattern:

...

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