一、准备基准包
1.Android源码根目录下新建OTA目录
Notebook-PC:~/aosp$ mkdir ~/OTA
2.编译生成基准包A_old
make -j4
make otapackage
cp out/target/product/<product_XXX>/obj/PACKAGING/target_files_intermediates/full_XXX-target_files-eng.zip
~/OTA/full_XXX-target_files-eng.A_old.zip
3.产生更新
增加一个apk/删除一个apk/修改系统版本号/或者其他能分辨系统差异的变更
4.编译生成基准包B_new
make -j4
make otapackage?
cp out/target/product/<product_XXX>/obj/PACKAGING/target_files_intermediates/full_XXX-target_files-eng.zip
~/OTA/full_XXX-target_files-eng.B_new.zip
二、编译差分包&签名
1、编译生成差分包
./build/tools/releasetools/ota_from_target_files -v ?-k?<key_path> -i
~/OTA/full_XXX-target_files-eng.A_old.zip
~/OTA/full_XXX-target_files-eng.B_new.zip
~/OTA/update.zip
具体的参数含义为 ：
?-v 显示具体编译命令
?-k 签名文件路径(如果不指定这个参数，key_path默认取值参考如下规则)
?-i? 产生增量包
<key_path> 取值规则如下，查看ProjectConfig.mk
1）如果MTK_SIGNATURE_CUSTOMIZATION=yes并且MTK_INTERNAL=no，
? ?<key_path>的值为：build/target/product/security/<Project>/releasekey
2）如果MTK_SIGNATURE_CUSTOMIZATION=yes并且MTK_INTERNAL=yes，
? ?<key_path>的值为：build/target/product/security/common/releasekey
3）如果MTK_SIGNATURE_CUSTOMIZATION=no
? ?<key_path>的值为：build/target/product/security/testkey
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