> ## Documentation Index > Fetch the complete documentation index at: https://dragonwingdocs.qualcomm.com/llms.txt > Use this file to discover all available pages before exploring further. # Qualcomm Linux metadata layers This section introduces the layers included in the [Qualcomm manifest](https://github.com/qualcomm-linux/meta-qcom-releases). 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 for registered users. This layer 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](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](https://git.openembedded.org/openembedded-core). | | `meta-openembedded` | Collection of layers for the OpenEmbedded build system. For more information, see [meta-openembedded](https://git.openembedded.org/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](https://git.yoctoproject.org/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](https://git.yoctoproject.org/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](https://git.yoctoproject.org/meta-security/tree/README.md?h=master). | | `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](https://github.com/uptane/meta-updater/blob/master/README.adoc). | ## **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 (registered users only) | `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](./adding-third-party-layers-to-workspace) | ## **Next steps** * [meta-qcom](./meta-qcom) — machine configurations, firmware recipes, kernel recipes, and BitBake classes * [meta-qcom-distro](./meta-qcom-distro) — distribution configurations, image recipes, and package groups * [meta-qcom-extras](./meta-qcom-extras) — optional layer for registered users * [Build Qualcomm Linux Using Yocto](./build-qualcomm-linux)