Re: Pass parameters to kernel when using chainloader method.

[Pascal Hambourg]

Le 26/12/2020 à 12:18, David Balažic a écrit :
> On Sat, 26 Dec 2020 at 07:31, Narcis Garcia via Support requests for
> the GRand Unified Bootloader <help-grub@gnu.org> wrote:
> > As I did understand, and please make me the right correction (or link
> > documentation):
> > BIOS calls MBR
> > MBR loads/calls GRUB
> > GRUB chainloads to disk sector where kernel begins.
> >
> > Last step does not allow to pass parameters because GRUB just loads
> > first 512 bytes of OS kernel?
>
> No, it loads the entire kernel, but that is a different command ("linux").
> The chainloader loads a boot sector (or more of them). This is the
> "chainloader" command. It is usually used to load and runa another
> boot loader, not directly an OS.

In the old days, a Linux kernel could boot directly from a floppy 
without a bootloader, so I guess it could be chainloaded like any other 
boot sector. But the Linux README file says :

 - Booting a kernel directly from a floppy without the assistance of a
   bootloader such as LILO, is no longer supported.

Indeed, a recent Linux kernel image still has a boot sector but it 
contains the following text :

 Use a boot loader.
 Remove disk and press any key to reboot...

Maybe some kernels other than Linux can still boot that way.