9e8d431a0d
The header of a .mrom image declares its length to be only a few kilobytes; the remainder is accessed via a sideband mechanism. This makes it difficult to append an additional ROM image, such as an EFI ROM. Add a second, dummy ROM header covering the payload portion of the .mrom image, allowing consumers to locate any appended ROM images in the usual way. Signed-off-by: Michael Brown <mcb30@ipxe.org>