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Mastering Embedded Linux Development
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Yocto metadata is organized around the following concepts:
These concepts map directly to actual byproducts of the build system, thus offering us guidance when designing our projects. We could rush to assemble everything inside a single layer, but that would likely result in a project that is inflexible and unmaintainable. Hardware inevitably gets revised, and one successful consumer device quickly multiplies into a series of products. For these reasons, it is better to adopt a multi-layered approach early on so that we end up with software components that we can easily modify, swap out, and reuse.
At a minimum, you should create individual distribution, BSP, and application layers...