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====== Edge2 Build Android ======

===== Introduction =====

This document mainly introduces how to compile the Android source code. You will learn how to compile different versions of Android source code.

===== Preparation =====

  * [[http://source.android.com/source/initializing.html]]
  * [[.download-android-source-code]]
  * [[.install-toolchains]]

===== Building =====

<WRAP important >
Before you start to build, make sure you have done all the Preperations listed above.
</WRAP>


Build ALL:

```shell
$ cd PATH_YOUR_PROJECT
$ source build/envsetup.sh
$ lunch kedge2-userdebug
$ ./build.sh -AUCKu
```
You can also distribute compilations:


Build U-Boot:

```shell
$ cd PATH_YOUR_PROJECT
$ source build/envsetup.sh
$ lunch kedge2-userdebug
$ ./build.sh -Uu
```

Build kernel:
```shell
$ cd PATH_YOUR_PROJECT
$ source build/envsetup.sh
$ lunch kedge2-userdebug
$ ./build.sh -CKu
```

Build Android:

```shell
$ cd PATH_YOUR_PROJECT
$ source build/envsetup.sh
$ lunch kedge2-userdebug
$ ./build.sh -Au
```

<WRAP info >
 Modify the file build.sh ''BUILD_JOBS=16'' as the number you want when you run ''BUILD_JOBS=n''.
</WRAP>

After executing ''./build.sh -u'', generate a complete firmware package in the ''rockdev/Image-xxx/directory''(xxx is the product name of the specific lunch).

```
rockdev/Image-xxx/
├── boot-debug.img
├── boot.img
├── config.cfg
├── dtbo.img
├── MiniLoaderAll.bin
├── misc.img
├── parameter.txt
├── pcba_small_misc.img
├── pcba_whole_misc.img
├── recovery.img
├── resource.img
├── super.img
├── uboot.img
├── update.img
└── vbmeta.img
```

Packing update.img:

```shell
$ cd PATH_YOUR_PROJECT
$ source build/envsetup.sh
$ lunch kedge2-userdebug
$ ./build.sh -u
```

<WRAP important >
After compiling, you need to reload ''update.img'' when flashing.
</WRAP>

===== See Also =====

  * [[/products/sbc/edge2/install-os/install-os-into-emmc-via-usb-tool|]]
  * [[/products/sbc/edge2/install-os/install-os-into-external-storage|]]