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 gardner.ben@gmail.com 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