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

[Ady]

> Hi,
> 
> Didier Spaier wrote:
> > http://slint.fr/testing/slint64-14.1_syslinux.6.03/slint64-14.1_syslinux.6.03.img
> 
> This looks like the content of an EFI system partition.
> Exactly what i need for experiments. Thanks a lot.
> 
 
 
I'm sorry to say that, for testing the possibility of booting optical 
media in UEFI X64 mode by means of syslinux.efi, that image is not 
ideal, for several reasons.

I posted a FAT12 image for such type of (hypothetical) testing during 
2015Oct:

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

There are potential improvements (or at least, variations) to be 
applied to that FAT12 image, one of them being updating both, 
"bootx64.efi" and "ldlinux.e64", inside the image to version 6.04-pre1.

Unfortunately, I do not recall that there was actual feedback about the 
image back then. Yet, let me be clear: I do not expect the image to 
solve the problem. Booting as optical media in UEFI X64 mode by means 
of "syslinux.efi" will still fail.

Until Peter and/or other Syslinux developers would invest their own 
time and skills to at least test the case, there won't be effective 
improvements.

Regarding the "Isohybrid" wiki page, there are some improvements to be 
made, but I wish we (or, I should say, users) would stop expecting 
"miracles" from this one wiki page (or from just two of them). For 
instance, users keep missing even the existence of the "--uefi" 
parameter, which suggests that the wiki page needs simplification and 
clarity, not "more details".

Still hoping for improvements,
Ady.