Qualcomm Linux metadata layers - Qualcomm Dragonwing Documentation

This section introduces the layers included in the Qualcomm manifest. This manifest includes all the layers required to reproduce the reference build.

Layer stack overview

The following figure shows the layers included in the Qualcomm Linux release:

Figure: Qualcomm Linux metadata layers

Figure: Qualcomm Linux metadata layers

Qualcomm-maintained layers

The following layers are maintained by Qualcomm and are specific to Qualcomm Linux development kits:

Metadata layer	Description
`meta-qcom`	Contains recipes that build software components for Qualcomm development kits and provides software features applicable to Qualcomm SoCs. This is the primary BSP layer.
`meta-qcom-distro`	Provides a reference distribution configuration for Qualcomm development kits. Image recipes and package groups are defined in this layer.
`meta-qcom-extras`	Optional metadata layer that enables source compilation of select components, which are otherwise provided as binaries in `meta-qcom`.

Community layers used

The following community-maintained layers are used by Qualcomm Linux. For upstream references, see https://git.yoctoproject.org/yocto-docs (wrynose branch).

Metadata layer	Description
`openembedded-core`	Provides build tools and recipe files for various software components needed for an embedded OS distribution. For more information, see openembedded-core.
`meta-openembedded`	Collection of layers for the OpenEmbedded build system. For more information, see meta-openembedded.
`meta-virtualization`	Contains packages for constructing OpenEmbedded virtualized solutions and virtualization stacks, such as Docker and Kubernetes. For more information, see meta-virtualization.
`meta-selinux`	Enables SELinux support. This layer includes reference SELinux policies and provides necessary tooling. To enable SELinux for Qualcomm Linux, set the variable `DEFAULT_ENFORCING` to `enforcing` in `conf/distro/include/qcom-distro-selinux.inc`. For more information, see meta-selinux.
`meta-security`	Provides security tools and hardening tools for Qualcomm Linux kernels and libraries for implementing security mechanisms. For more information, see meta-security.
`meta-updater`	Enables over-the-air updates (OTA) with OSTree. OSTree is a tool for atomic full file system upgrades with rollback capability. For more information, see meta-updater.

When to use which layer

Goal	Layer to modify
Add or change machine configuration	`meta-qcom`
Change distribution features or add image recipes	`meta-qcom-distro`
Source-compile proprietary components (for users with a Qualcomm ID and verified company access)	`meta-qcom-extras`
Add virtualization or container support	`meta-virtualization`
Enable SELinux	`meta-selinux`
Enable OTA updates	`meta-updater`
Add a third-party layer	See Add third-party layers to the workspace

Next steps

meta-qcom — machine configurations, firmware recipes, kernel recipes, and BitBake classes
meta-qcom-distro — distribution configurations, image recipes, and package groups
meta-qcom-extras — optional layer for users with a Qualcomm ID and verified company access
Build Qualcomm Linux Using Yocto

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