[syslinux] Changes to get CD to boot on EFI System.

[Ady]

> I'm not sure which is the intent of the El Torito spec and perhaps more
> importantly, what reality looks like, w.r.t. UEFI - whether it expects
> that the boot image is a partition or an EFI executable.
> 
 
 
Neither. For booting optical media in UEFI mode (and, please let's 
leave comments about isohybrid out at this point) you need a 
partitionless (aka superfloppy) of less than 32MiB, with some 
additional alignment.

I am purposely leaving out further / advanced possibilities. Let's not 
be picky. I would suggest solving the basic case first, and we can 
discuss further developments / options / alternatives later.

Peter, see the attachment in:

 http://www.syslinux.org/archives/2015-October/024526.html 

for an example of what "should" eventually work in the future (when 
syslinux.efi gets the relevant capabilities).

Regards,
Ady.