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

From: Glenn Washburn
Subject: Re: [PATCH] docs: Document extra arguments to chainloader on EFI
Date: Thu, 15 Dec 2022 23:22:58 -0600

I sent this before realizing that this was already in the EFI
chainload patch series and that that series is good (I previously
thought that it was the wrong way to fix the issue). So please ignore,
unless the EFI chainloader patch is not acceptable.


On Thu, 15 Dec 2022 15:06:53 -0600
Glenn Washburn <> wrote:

> 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 +image.
> +
>  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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