Our syslinux supports ext2/3/4 now, so we don't need the fat fs for iso image any more.
(In reply to comment #0) > Our syslinux supports ext2/3/4 now, so we don't need the fat fs for iso > image any more. s/iso image/hdd image/
After more investigations, it seems that it's not a good idea to get rid of fat since efi needs it, we need make the code very different if we really have to get rid of fat for bootimg (when bios and efi).
Please see my last comments, I think that we don't need do this.
Verified as per last comment.