[CentOS] CentOS 7 install on one RAID 1

Hi, folks,

   I'm building a new box, and I want three partitions - /boot, /, and
swap, on *one* RAID 1, not three separate partitions. Other than
<alt-f2> mdadm..., *is* there any way in the graphical installer to do
this? All I see is a way to make three separate partitions.

   Pointers to links happily accepted.

       mark, back to googling