Hi!
I am trying to port the ASRock FM2A88M-HD+ board. Should be a good board for my first coreboot port, since the reference code for the chipset and the datasheet for the superio chip are available. And it's quite inexpensive.
I gathered some information and created a wiki page for it: http://www.coreboot.org/Board:asrock/fm2a88m-hd%2B
Regards Felix