Looking for Yocto-supported Reference Design

Hello,
	My name is David Richards and I am blind. I am new to Yocto. I would
like to build a portable talking e-book reader. The goal is to support
DAISY, Audible, Kindle, and epub books. In addition, I would like to be able
to stream MP3 content. To that end, I am looking for a reference design to
base the project on. It does not require/use a display or touchpad. The user
interface will utilize buttons and speech output. The design should have
existing Yocto support, if possible.
	Does anyone have any pointers for a reference design I could start
with?
	Many thanks,
	David