## Introduction The `meta-agl` layer provides the minimal set of software to boot an AGL Distribution system. You use this layer as the minimal core on which to build AGL profiles. **NOTE:** The `meta-agl` layer does not include a reference UI. The reference UI is included as part of the [`meta-agl-demo`](./meta-agl-demo.html) layer. ## Sub-Layers The `meta-agl` layer itself contains many sub-layers and files. Following is a "tree" look at the layer: ``` |-- LICENSE |-- LICENSE.GPL-2.0-only |-- LICENSE.MIT |-- README-AGL.md |-- README.md -> meta-agl.md |-- agl-layers-overview.md |-- docs |-- meta-agl-bsp |-- meta-agl-core |-- meta-agl-core-test |-- meta-agl-ic |-- meta-agl-ivi |-- meta-agl.md |-- meta-app-framework |-- meta-netboot |-- meta-pipewire |-- scripts `-- templates ``` This list provides some overview information on the files and sub-layers in `meta-agl`: * LICENSE* : licenses of the various components. * README* : RTFM * agl-layers-overview.md: references to the various layers that make up AGL * `docs`: Contains files that support AGL documentation. * `meta-agl-bsp`: Contains adaptations for recipes and required packages to boot an AGL distribution on targeted hardware and emulation (i.e. QEMU). * `meta-agl-core`: This is the core layer with essential recipes and the distro. * `meta-agl-core-test`: recipes supporting qa images (separate layer due to external dependencies) * `meta-agl-ic`: Instrument Cluster platform * `meta-agl-ivi`: IVI platform * `meta-app-framework`: Configuration and recipes supporting the AGL Application Framework. * `meta-netboot`: Contains recipes and configuration adjustments to allow network boot through network block device (NBD) since network file system (NFS) does not support security labels. * `meta-pipewire`: Configuration and recipes supporting pipewire as audio manager * `scripts`: AGL development setup and support scripts. * `templates`: Base, feature, and machine templates used in the AGL development environment. ## Packagegroups This section describes the AGL [packagegroup](https://yoctoproject.org/docs/2.4.4/dev-manual/dev-manual.html#usingpoky-extend-customimage-customtasks) design: ### core non-ui packagegroups: meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-core-connectivity.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-core-devel.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-core-security.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-core-os-commonlibs.bb ### graphical subsystem meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-profile-graphical.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-graphical-multimedia.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-graphical-weston.bb ### image-related packagegroups meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-core-boot.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-image-boot.bb meta-agl-core/recipes-platform/packagegroups/packagegroup-agl-image-minimal.bb ### QA/Test related packagegroups meta-agl-core-test/recipes-test/packagegroups meta-agl-core-test/recipes-test/packagegroups/packagegroup-agl-test.bb ## Images ### (Barely) bootable image meta-agl-core/recipes-platform/images/agl-image-boot.bb ### minimal image and SDK (console) meta-agl-core/recipes-platform/images/agl-image-minimal.bb meta-agl-core/recipes-platform/images/agl-image-minimal-crosssdk.bb ### weston-based image for re-use meta-agl-core/recipes-platform/images/agl-image-weston.bb ### image for use in the YP autobuilder meta-agl-core/recipes-platform/images/agl-image-core-autobuilder.bb ### image with extra QA tooling (e.g. to run LTP) meta-agl-core-test/images/agl-image-minimal-qa.bb