The EFI Boot Stub
  		     ---------------------------
  
  On the x86 platform, a bzImage can masquerade as a PE/COFF image,
  thereby convincing EFI firmware loaders to load it as an EFI
  executable. The code that modifies the bzImage header, along with the
  EFI-specific entry point that the firmware loader jumps to are
  collectively known as the "EFI boot stub", and live in
  arch/x86/boot/header.S and arch/x86/boot/compressed/eboot.c,
  respectively.
  
  By using the EFI boot stub it's possible to boot a Linux kernel
  without the use of a conventional EFI boot loader, such as grub or
  elilo. Since the EFI boot stub performs the jobs of a boot loader, in
  a certain sense it *IS* the boot loader.
  
  The EFI boot stub is enabled with the CONFIG_EFI_STUB kernel option.
  
  
  **** How to install bzImage.efi
  
  The bzImage located in arch/x86/boot/bzImage must be copied to the EFI

  System Partition (ESP) and renamed with the extension ".efi". Without

  the extension the EFI firmware loader will refuse to execute it. It's
  not possible to execute bzImage.efi from the usual Linux file systems
  because EFI firmware doesn't have support for them.
  
  
  **** Passing kernel parameters from the EFI shell
  
  Arguments to the kernel can be passed after bzImage.efi, e.g.
  
  	fs0:> bzImage.efi console=ttyS0 root=/dev/sda4
  
  
  **** The "initrd=" option
  
  Like most boot loaders, the EFI stub allows the user to specify
  multiple initrd files using the "initrd=" option. This is the only EFI
  stub-specific command line parameter, everything else is passed to the
  kernel when it boots.
  
  The path to the initrd file must be an absolute path from the
  beginning of the ESP, relative path names do not work. Also, the path
  is an EFI-style path and directory elements must be separated with
  backslashes (\). For example, given the following directory layout,
  
  fs0:>
  	Kernels\
  			bzImage.efi
  			initrd-large.img
  
  	Ramdisks\
  			initrd-small.img
  			initrd-medium.img
  
  to boot with the initrd-large.img file if the current working
  directory is fs0:\Kernels, the following command must be used,
  
  	fs0:\Kernels> bzImage.efi initrd=\Kernels\initrd-large.img
  
  Notice how bzImage.efi can be specified with a relative path. That's
  because the image we're executing is interpreted by the EFI shell,
  which understands relative paths, whereas the rest of the command line
  is passed to bzImage.efi.