To check out a branch other than “master”, specify it with -b:
$ repo init -u git://android.git.kernel.org/platform/manifest.git -b <froyo>
What should I write as ‘-b’ option parameter for Android 3.0 HoneyComb so as to check out it from source repository ?
That is a pretty easy answer.
Google has not released the honeycomb source, so you cannot clone it. And they will probably never release it. However they have promised to release the Ice Cream Sandwich source eventually.
The Honeycomb sources which are GPL and can be build together with the rest of the Gingerbread release have however been released. If you do a:
you will get Gingerbread + AOSP patches + Honeycomb sources for the GPL licensed parts of Honeycomb (which are quite few of them.)