Cubieboard has already supported the SD boot，it default thar insert SD-CARD can be achieved SD boot.So we just need a small and simple software that you can create SD boot image.
Of course, you should prepare a card-reader, an SD-card.
Note : This operation should be in the Windows !
At first , download PhoenixCard into your machine,and decompression it.
Set the relevant entries:
Finally remove SD-Card from your machine,and insert the card into Cubieboard,give the power.Now you will see the Android system boot from the SD card!
You can download the PhoenixCard_V310 from here