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[PATCH] docs: Document extra arguments to chainloader on EFI

From: Glenn Washburn
Subject: [PATCH] docs: Document extra arguments to chainloader on EFI
Date: Thu, 15 Dec 2022 15:06:53 -0600

Extra arguments given to chainloader on EFI platforms will be sent to
the chainloaded application. Also, minor edit in the chainloading section
to note that chainloading can be a jump via the firmware and not
necessarily in real mode (which does not exist on some achitectures).

Signed-off-by: Glenn Washburn <>
 docs/grub.texi | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/docs/grub.texi b/docs/grub.texi
index 1752fcb7db..536a0e7e37 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -979,7 +979,7 @@ invoke shutdown machinery.
 Operating systems that do not support Multiboot and do not have specific
 support in GRUB (specific support is available for Linux, FreeBSD, NetBSD
 and OpenBSD) must be chain-loaded, which involves loading another boot
-loader and jumping to it in real mode.
+loader and jumping to it in real mode or via the firmware.
 The @command{chainloader} command (@pxref{chainloader}) is used to set this
 up.  It is normally also necessary to load some GRUB modules and set the
@@ -4050,10 +4050,13 @@ a list of commands that could use more documentation:
 @node chainloader
 @subsection chainloader
-@deffn Command chainloader [@option{--force}] file
+@deffn Command chainloader [@option{--force}] file [args...]
 Load @var{file} as a chain-loader. Like any other file loaded by the
 filesystem code, it can use the blocklist notation (@pxref{Block list
 syntax}) to grab the first sector of the current partition with @samp{+1}.
+On EFI platforms, any arguments after @var{file} will be sent to the loaded
 If you specify the option @option{--force}, then load @var{file} forcibly,
 whether it has a correct signature or not. This is required when you want to
 load a defective boot loader, such as SCO UnixWare 7.1.

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