Where to download Android 2.2 Froyo source code?

I want to download android 2.2 froyo source code, but actually here https://android.googlesource.co开发者_StackOverflow社区m is available android 2.3 gingerbread. How can I switch to previous version?

You'll want to pick a project and select the 'froyo' branch or use one of the 'android-2.2' tags to pull the 2.2 source after cloning the project's repo.