please check the arch/i386/init/ldscript.lb
the line .=_ROMBASE + ROM_IMAGE_SIZE - 0x10000;
will force linuxbios_rom at last 64K
the better solution will be for fallback image
if .eram < (_ROMBASE + ROM_IMAGE_SIZE - 0x10000) . (_ROMBASE + ROM_IMAGE_SIZE - 0x10000) endif
then you can try to reduce ROM_IMAGE_SIZE to squash linuxbios_rom to the rom.
or the best solution to get the linuxbios_rom size and reverse the start point..
YH