[coreboot] The OS of open source solution

Hi Maillinglist,
    I’m now trying to boot OS with open source solution (Coreboot + SeaBIOS), but have some questions. For example,
        1.Which OS can be supported by this kind of solution? For example, is Win7 or Win8 supported?
 2.How to build/create or customize the OS images?
Thanks，
Free_QP