-d secs   timeout in 10th of second before booting
-h        this help text
-V        print version
-v        verbose level(can appear multiple times)
-a        always check for alternate kernel image
-i file   load file as the initial ramdisk
-m file   load file as additional boot time vmm module
-C file   indicate the config file to use
-P        parse config file only (verify syntax)
-D        enable debug prints
-p        force interactive mode
-c name   image chooser to use
-E        do not force EDD30 variable
-r        kernel image can be relocated if load address inexistent
-F file   name of a specific FPSWA EFI driver to load

Global options supported:
default=string, timeout=number, delay=number, debug, prompt, verbose=number, root=filename, read-only, noedd30, append=kernel_options, initrd=filename, vmm=filename, image=filename, checkalt, chooser=string, message=filename, f1=filename, f2=filename, f3=filename, f4=filename, f5=filename, f6=filename, f7=filename, f8=filename, f9=filename, f10=filename, f11=filename, f12=filename, fpswa=filename, relocatable

Image options supported:
root=filename, read-only, append=kernel_options, literal=kernel_options, initrd=filename, vmm=filename, label=string, image=filename, description=string, relocatable