Added AGL Layers in Developer Guides

Revised and added AGL Layers as a part of Developer Guides.

Bug-AGL: [SPEC-3633]

Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: Ie66bd8bfd89d129c7fc49c20a83c331e069e4a46

1 files changed, 159 insertions, 0 deletions

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+---
+title: meta-agl-demo
+---
+
+## Introduction
+
+The `meta-agl-demo` layer is the reference user interface layer for the DEMO
+platform of Automotive Grade Linux (AGL).
+The layer provides a reference platform and applications.
+The BitBake target name for the DEMO platform is `agl-demo-platform`, which is
+the full DEMO platform image.
+
+## Layer Dependencies
+
+This section describes dependencies for the `meta-agl-demo` layer.
+Dependencies are grouped into base, hardware, and feature dependencies.
+
+### Base Dependencies
+
+The `meta-agl-demo` layer has the following base dependencies:
+
+- Yocto Project Release:
+
+    - URI: git://git.yoctoproject.org/poky
+    - Branch: "thud"
+    - Tested Revision: See the
+      [`default.xml`](https://github.com/leon-anavi/AGL-repo/blob/master/default.xml)
+      manifest file for the `AGL-repo` repository for revision information.
+
+- AGL `meta-agl` Layer:
+
+    - URI: https://gerrit.automotivelinux.org/gerrit/AGL/meta-agl
+    - Branch: "master"
+
+- OpenEmbedded `meta-openembedded` Layer:
+
+    - Branch: "thud"
+    - Tested Revision: See the
+      [`default.xml`](https://github.com/leon-anavi/AGL-repo/blob/master/default.xml)
+      manifest file for the `AGL-repo` repository for revision information.
+
+    Specifically, out of `meta-openembedded`, these sub-layers are used:
+
+    - `meta-oe`
+    - `meta-multimedia`
+    - `meta-networking`
+    - `meta-python`
+
+- Yocto Project `meta-qt5` Layer from the
+  [OpenEmbedded Layer Index](https://layers.openembedded.org/layerindex/branch/master/layers/):
+
+    - URI: https://github.com/meta-qt5/meta-qt5.git
+    - Branch: "thud"
+    - Tested Revision: See the
+      [`default.xml`](https://github.com/leon-anavi/AGL-repo/blob/master/default.xml)
+      manifest file for the `AGL-repo` repository for revision information.
+
+### Hardware Dependencies
+
+Aside from the previously listed base dependencies, if you are using a
+[supported Renesas board](../../0_Getting_Started/2_Building_AGL_Image/5_3_RCar_Gen_3.md)
+supported Renesas board, these dependencies exist:
+
+- AGL's `meta-renesas` Layer:
+
+    - URI: https://gerrit.automotivelinux.org/gerrit/AGL/meta-renesas
+
+### Feature Dependencies
+
+The `meta-agl-demo` layer has the following AGL [feature](../../0_Getting_Started/2_Building_AGL_Image/3_Initializing_Your_Build_Environment.md#agl-features)
+dependencies:
+
+- Yocto Project `meta-security` Layer:
+
+    - URI: https://git.yoctoproject.org/cgit/cgit.cgi/meta-security
+    - Branch: "master"
+    - Tested Revision: See the
+      [`default.xml`](https://github.com/leon-anavi/AGL-repo/blob/master/default.xml)
+      manifest file for the `AGL-repo` repository for revision information.
+
+- AGL's `meta-app-framework` Layer within the `meta-agl` Layer:
+
+    - URI: https://gerrit.automotivelinux.org/gerrit/gitweb?p=AGL/meta-agl.git
+    - Branch: "master"
+
+**The `agl-sota` Feature:**
+
+- Here Technologies' `meta-updater` Layer:
+
+    - URI: https://github.com/advancedtelematic/meta-updater/
+    - Branch: "thud"
+
+- Here Technologies' `meta-updater-qemux86-64` Layer:
+
+    - URI: https://github.com/advancedtelematic/meta-updater-qemux86-64/
+    - Branch: "thud"
+
+- OpenEmbedded's `meta-openembedded` Layer:
+
+    - URI: https://github.com/openembedded/meta-openembedded
+    - Branch: "thud"
+    - Tested Revision: See the
+      [`default.xml`](https://github.com/leon-anavi/AGL-repo/blob/master/default.xml)
+      manifest file for the `AGL-repo` repository for revision information.
+
+    Specifically, out of `meta-openembedded`, these sub-layers are used:
+
+    - `meta-filesystems`
+    - `meta-oe`
+    - `meta-python`
+
+**The `agl-netboot` Feature:**
+
+- AGL's `meta-netboot` Layer within the `meta-agl` Layer:
+
+    - URI: https://gerrit.automotivelinux.org/gerrit/gitweb?p=AGL/meta-agl.git
+    - Branch: "master"
+
+
+## Packagegroups
+
+AGL DEMO Platform's [packagegroups](https://www.yoctoproject.org/docs/3.1.2/dev-manual/dev-manual.html#usingpoky-extend-customimage-customtasks)
+consist of the following:
+
+- packagegroup-agl-demo-platform
+
+    This packagegroup is used for generating the `agl-demo-platform` image,
+    which is the full image for the AGL distributions IVI profile. You can see the
+    recipe (i.e. `agl-demo-platform.bb`) that installs the
+    `packagegroup-agl-demo-platform` packagegroup [here](https://git.automotivelinux.org/AGL/meta-agl-demo/tree/recipes-platform/images/agl-demo-platform.bb).
+
+    As meta-agl's design of packagegroups, the `agl-demo-platform.bb` recipe installs
+    only `packagegroup-agl-demo-platform` and the packages of the DEMO applications.
+
+    ``agl-demo-platform`` contains the following three packagegroups:
+
+      * `packagegroup-agl-image-minimal`
+      * `packagegroup-agl-image-ivi`
+      * `packagegroup-agl-demo-platform`
+
+- packagegroup-agl-appfw*
+
+    These packagegroups contain packages for the AGL distribution's
+    Application Framework. Subsystem should maintain
+    `packagegroup-agl-appfw-[subsystem].bb`, which should hold sufficient packages
+    for the Application Framework.
+
+    Subsystems also can maintain their own packagegroups using appropriate
+    `recipes-*/`.
+
+    For example, Qt5 has two packagegroups in `meta-agl-demo`:
+    `packagegroup-agl-appfw-native-qt5` and `packagegroup-agl-demo-qt-examples`,
+    which are under `recipes-qt/`.
+
+    The `packagegroup-agl-appfw-native-qt5` is included by `packagegroup-agl-appfw-native` because Qt5 belongs to native application framework of AGL Distro.
+
+    Because the `packagegroup-agl-demo-qt-examples` is not mandatory for the AGL
+    Application Framework and the AGL DEMO, the packagegroup is added to the layer's
+    `local.conf` file only when needed.
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