NanoPi K2 (Amlogic S905) Ubuntu 16.04 编译Android 5.1系统源码
在这里下载https://www.mediafire.com/folder/8xn2iirciznqh/S905压缩包，或者使用repo进行下载。按照https://wiki.friendlyarm.com/wiki/index.php/NanoPi_K2/zh这里下载。
2. 编译编译的方法https://wiki.friendlyarm.com/wiki/index.php/NanoPi_K2/zh，为防止链接失效，我这里备份一下：
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编译Android 搭建编译环境搭建编译Android的环境建议使用64位的Ubuntu 16.04，安装需要的包即可。
sudo apt-get install bison g++-multilib git gperf libxml2-utils make python-networkx zip sudo apt-get install flex libncurses5-dev zlib1g-dev gawk minicom
更多说明可查看 https://source.android.com/source/initializing.html 。
下载Android5.1源代码Android源代码的下载需要使用repo，其安装和使用请查看 https://source.android.com/source/downloading.html 。
mkdir android && cd android repo init -u https://github.com/friendlyarm/android_manifest.git -b nanopi-k2-lollipop repo sync
其中“android”是指工作目录。
编译系统source build/envsetup.sh lunch nanopi_k2-userdebug make -j8
编译成功完成后，目录 out/target/product/nanopi-k2 下包含可用于烧写的image文件。
filename partition Description u-boot.bin bootloader - boot.img boot - cache.img cache - userdata.img userdata - system.img system - partmap.txt - 分区描述文件烧写到SD卡
如果是采用SD卡启动Android，可复制编译生成的image文件到sd-fuse_amlogic/android/ 下，使用脚本即可烧到到SD卡，具体请查看#在Linux Desktop下通过脚本制作。
使用fastboot更新板子启动后通过串口快速按任意键进入uboot命令行模式，输入命令fastboot usb即可更新Android。
连接USB线，然后PC端输入以下命令:
cd out/target/product/nanopi-k2 sudo fastboot flash boot boot.img sudo fastboot flash cache cache.img sudo fastboot flash userdata userdata.img sudo fastboot flash system system.img sudo fastboot reboot
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3. 遇到的问题 1.JDK版本问题源码里自带了自己需要使用的1.7版本，你的系统中装的不一定是1.7版本的。直接加上一个全局变量，让编译的时候使用自带的解决JDK版本的问题。
解决方案export ANDROID_SET_JAVA_HOME=true2. JniInvocation.cpp:165: error: unsupported reloc 43
... libnativehelper/JniInvocation.cpp:165: error: unsupported reloc 43 libnativehelper/JniInvocation.cpp:165: error: unsupported reloc 43 libnativehelper/JniInvocation.cpp:165: error: unsupported reloc 43 libnativehelper/JniInvocation.cpp:165: error: unsupported reloc 43 ...解决方案
具体的原因是使用clang编译art时遇到点问题，使用clang而不使用gcc是想log内容好看一些，这里不使用即可。来源：https://github.com/gmacario/easy-jenkins/issues/88
export WITHOUT_HOST_CLANG=false
注：其它博客上写的修改源码的方式也是禁用clang，这里能用export解决就不修改源码。：）
3. public_api.txt:20: error 5: Added public field android.Manifest.permission.BACKUP新源码，根本没有修改任何代码，怎么上来就需要make update-api呢？应该是别的错误引起的，最终找到了解决方案。
Checking API: checkpublicapi-current
out/target/common/obj/PACKAGING/public_api.txt:20: error 5: Added public field android.Manifest.permission.BACKUP
out/target/common/obj/PACKAGING/public_api.txt:82: error 5: Added public field android.Manifest.permission.INVOKE_CARRIER_SETUP
out/target/common/obj/PACKAGING/public_api.txt:106: error 5: Added public field android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE
out/target/common/obj/PACKAGING/public_api.txt:116: error 5: Added public field android.Manifest.permission.RECEIVE_EMERGENCY_BROADCAST
******************************
You have tried to change the API from what has been previously approved.
To make these errors go away, you have two choices:
1) You can add "@hide" javadoc comments to the methods, etc. listed in the
errors above.
2) You can update current.txt by executing the following command:
make update-api
To submit the revised current.txt to the main Android repository,
you will need approval.
******************************
解决方案：
根据：https://*.com/a/42654807/2193455 和 https://android.googlesource.com/platform/system/core/+/dd060f01f68ee0e633e9cae24c4e565cda2032bd%5E%21 需要修改 system/core/libutils/String8.cpp
diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index 9092cbc..3323b82 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -424,7 +424,7 @@
next = len;
}
- memcpy(buf + tail, buf + index + skip, next - index - skip);
+ memmove(buf + tail, buf + index + skip, next - index - skip);
tail += next - index - skip;
index = next;
}
4. 我的完整编译脚本，需要的请拿去
#!/bin/bash # author: kangear # e-mail: kangear@163.com # wechat: kangear # only for android 5.1 (NanoPi-K2 Amologic S905) # export http_proxy=127.0.0.1: # install from wiki sudo apt-get -y install bison g++-multilib git gperf libxml2-utils make python-networkx zip flex libncurses5-dev zlib1g-dev gawk minicom git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z-dev ccache libgl1-mesa-dev libxml2-utils xsltproc unzip # For Jdk 1.7 # sudo add-apt-repository -y ppa:openjdk-r/ppa # sudo apt-get -y update # sudo apt-get -y install openjdk-7-jdk export ANDROID_SET_JAVA_HOME=true # cache export USE_CCACHE=1 # fix: libnativehelper/JniInvocation.cpp:165: error: unsupported reloc 43 export WITHOUT_HOST_CLANG=false # fix: public_api.txt:20: error 5: Added public field android.Manifest.permission.BACKUP sed -i '427s/memcpy/memmove/' ./system/core/libutils/String8.cpp # ccache size prebuilts/misc/linux-x86/ccache/ccache -M 200G # for nanopi_k2 source build/envsetup.sh lunch nanopi_k2-userdebug # make make -j325. 截图