It turned out to be a lot easier than I expected.

A patch can be found here:
https://www.coreboot.org/pipermail/seabios/2016-March/010551.html


On Wed, Mar 9, 2016 at 10:40 AM, Ben Gardner <[email protected]> wrote:
> Hi All,
>
> Before I get too far investigating adding FMAP support to SeaBIOS, I
> just wanted to check if anyone else is working on this or has done
> this.
>
> The goal is to have SeaBIOS look in an alternate CBFS for bootable img/* 
> items.
>
> The plan is to have SeaBIOS find the FMAP location via the
> BOOT_MEDIA_PARAMS (0x30) CB tag and then scan all available CBFS in
> cbfs_payload_setup().
>
> Thanks,
> Ben

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