Hi SeaBios developers:
I would like to build SeaBios as payload of chromebook Depthcharge instead of coreboot, because Depthcharge seems to have some additional device initialization on per-board basis. I did some search and found SeaBios could be used as Grub2 payload, so I guess this is not mission impossible.
According to google's doc here: http://dev.chromium.org/chromium-os/developer-information-for-chrome-os-devi... , depthcharge can copy any 32-bit blob into 0x100000, and directly jump to it. So I will need the entry_elf to be 0x100000, and in addition, anything instruction below 0x100000 should be safely descarded without impacting seabios's functionality(because depthcharge always jump to the beginning of the blob).
Is it possible to build such a seabios raw blob with entry point as 0x100000? If not, maybe I can use some 2-step jump: let depthcharge jump to 0x100000 first, then jump to the real entry_elf? As I know nothing about linkerscript or assembly, maybe some of you could help me figure out.