I don't think many people care what boot loader they have or what firmware they run. If you want something that always works, grub is a good standard to stick t

I don't think many people care what boot loader they have or what firmware they run. If you want something that always works, grub is a good standard to stick to. For everyone else there is the many options like this gummiboot integration, bare EFI, LILO, NTLDR, SYSLINUX and all the others. Ironically, most linux installs are not using any of those because most installs aren't desktop installs; clouds usually don't have an emulated EFI stack at all, and embedded uses things like u-boot.