Where do I download Android kernel source code (2.2 froyo)

I have downloaded Android source code (2.2 froyo) but it doesn't have the kernel source. Where do I download Android 2.2 froyo kernel source 开发者_如何学Gocode?

Thanks in advance.

Here :

git clone git://android.git.kernel.org/kernel/common.git

Here is a direct link to a .zip file of the Froyo sources http://www.bigbluebrains.com/index.php/2010/08/08/browsing-android-2-2-froyo-source-code-in-eclipse/