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[PATCH 2/2] docs: Document that extra arguments to chainloader on EFI

From: Glenn Washburn
Subject: [PATCH 2/2] docs: Document that extra arguments to chainloader on EFI
Date: Thu, 25 Aug 2022 23:32:03 -0500

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 a463f9e354..34a00dd5a9 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -965,7 +965,7 @@ information.
 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
@@ -4011,10 +4011,13 @@ 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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