08-18-2011
"unknown" means "unknown". "octet-steam" means "bunch of bytes in a row", which you might know better as the term "binary file".
All in all not that helpful, unfortunately. You might have better luck looking at grub's source code.
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LEARN ABOUT CENTOS
grub-glue-efi
GRUB-GLUE-EFI(1) User Commands GRUB-GLUE-EFI(1)
NAME
grub-glue-efi - generate a fat binary for EFI
SYNOPSIS
grub-glue-efi [OPTION...] [OPTIONS]
DESCRIPTION
grub-glue-efi processes ia32 and amd64 EFI images and glues them according to Apple format.
Glue 32-bit and 64-bit binary into Apple universal one.
-3, --input32=FILE
set input filename for 32-bit part.
-6, --input64=FILE
set input filename for 64-bit part.
-o, --output=FILE
set output filename. Default is STDOUT
-v, --verbose
print verbose messages.
-?, --help
give this help list
--usage
give a short usage message
-V, --version
print program version
Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.
REPORTING BUGS
Report bugs to <bug-grub@gnu.org>.
SEE ALSO
The full documentation for grub-glue-efi is maintained as a Texinfo manual. If the info and grub-glue-efi programs are properly installed
at your site, the command
info grub-glue-efi
should give you access to the complete manual.
grub-glue-efi (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-GLUE-EFI(1)