Hello,
In the past I posted a question at http://www.flashrom.org/pipermail/flashrom/2013-April/010924.html about failure to run flashrom on the new AMD SOC. It turns out the SPI flash interface has introduced incompatible changes from SB600. I have created a quick hack and made it available at http://blogs.coreboot.org/blog/2013/06/26/gsoc-2013-flashrom-week-1-while1/. Based on the discussion there I'm posting the patch here as well. Hope it will be helpful.