git remote add android-kernel-msm https://android.googlesource.com/kernel/msm
git remote set-branches android-kernel-msm android-msm-hammerhead-3.4-marshmallow-mr1
git fetch android-kernel-msm
git checkout -b android-msm-hammerhead android-kernel-msm/android-msm-hammerhead-3.4-marshmallow-mr1
git read-tree --prefix=kernel/ -u android-msm-hammerhead