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Different components of the AGL layers are under different licenses (a mix
of MIT and GPLv2). See LICENSE.GPL-2.0-only and LICENSE.MIT for further
details of the individual licenses.

All metadata (e.g. .bb, .bbappend, .bbclass, .inc, templates/* and similar)
is MIT licensed unless otherwise stated.
Source code included in tree for individual recipes (e.g. patches) are under
the LICENSE stated in the associated recipe (.bb file) unless otherwise stated.

License information for any other files (scripts) is either explicitly stated
or defaults to GPL version 2 only.

Individual files can contain the following style tags instead of the full
license text to identify their license:

    SPDX-License-Identifier: GPL-2.0-only
    SPDX-License-Identifier: MIT

This enables machine processing of license information based on the SPDX
License Identifiers that are here available: http://spdx.org/licenses/
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */ }
## 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-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-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