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====== VIM4 Build Android ======

===== Preparations =====

  * [[http://source.android.com/source/initializing.html|Set up a Build Environment]]
  * [[products:sbc:vim4:development:android:download-android-source-code|Downloading the Android Source]]
  * [[products:sbc:vim4:development:android:install-toolchains|Install Toolchains for the Amlogic Platform]]

===== Building =====


<WRAP important >
Make sure you have done all the ''Preparations'' listed above before getting started.
</WRAP>


==== Build U-Boot ====

```shell
$ cd PATH_YOUR_PROJECT
$ cd bootloader/uboot
$ ./mk kvim4 --avb2 --vab
```
Gernerate images in this step:

  * ''build/u-boot.bin'': for onboard eMMC storage booting
  * ''build/u-boot.bin.sd.bin'': for external TF card booting

==== Build Linux Kernel ====


```shell
$ ./mk kvim4 -v 5.4 -jN
```

<WRAP important >
Replace ''N'' with the actual number of threads on your own computer.
</WRAP>


==== Build Android ====


```shell
$ cd PATH_YOUR_PROJECT
$ . build/envsetup.sh
$ lunch TARGET_LUNCH
$ make -jN otapackage
```

Gernerate images in this step: ''out/target/product/TARGET/update.img''.


<WRAP important >
  * Unlike VIM3,  VIM4 doesn't support compiling Android and Linux Kernel at the same time.
  * Replace ''N'' with the actual number of threads on your own computer
  * Replace ''TARGET_LUNCH'' to your lunch select.
    * For VIM4, it's ''kvim4-userdebug''.

</WRAP>


==== Build Script Demo ====

```sh demo.sh
$ cat demo.sh
#!/bin/bash

#build U-Boot
if [ "$1" == 'u' ] || [ "$1" == 'n' ]; then	
	echo "build U-Boot"
	cd bootloader/uboot
	./mk kvim4 --avb2 --vab 
	cd -
fi

#build Kernel
if [ "$1" == 'k' ] || [ "$1" == 'n' ]; then
	echo "build Kernel"
if [ "$2" == 'n' ] || [ "$1" == 'n' ]; then
	. build/envsetup.sh 
	lunch kvim4-userdebug 
	make distclean
fi	
	./mk kvim4 -v 5.4 -j100
fi

#build Android
if [ "$1" == 'a' ] || [ "$1" == 'n' ]; then
	echo "build Android"
if [ "$2" == 'n' ] || [ "$1" == 'n' ]; then
	. build/envsetup.sh 
	lunch kvim4-userdebug 
	make clean
fi	 
	. build/envsetup.sh 
	lunch kvim4-userdebug 
	make installclean
	#make -j80 otapackage
	make -j80
fi
```

**Build U-Boot:**
```shell
$ ./demo.sh u
```

**Build Kernel:**

```shell
$ ./demo.sh k
```

**Build Android:**

```shell
$ ./demo.sh a
```

**Build all:**

```shell
$ ./demo.sh n
```