[syslinux] Bootloader data in /boot vs package systems (and atomic updates)

[Ady]

> 
> > The alternative is an additional script that would run the installer
> > binary extlinux and copy *.c32 at the same time.
> 
 
FWIW and just as one example, ArchLinux has its own script, 
"syslinux-install_update -i -a -m".
-i : install SYSLINUX;
-a : mark partition as "active";
-m : install mbr boot code.

I have not checked whether currently the syslinux-install_update.sh 
script supports UEFI (probably not).
 https://gist.github.com/pyther/772138 

Regards,
Ady.