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Re: Grub2 on UEFI

From: Michal Suchanek
Subject: Re: Grub2 on UEFI
Date: Fri, 29 Jan 2010 18:02:34 +0100

On 29/01/2010, Georgy Buranov <address@hidden> wrote:
> > ?????????????????? What about chainloading in grub2? Does it support 
> > loading another
> > EFI loader? Particularly, I want to load Windows Boot Manager (in term of
>  > EFI that's EFI file) from GRUB?
> > On Apple EFI I can chainload just fine, this should be no different on UEFI.
> What do you mean by chainloading in case of UEFI? For example, I got EFI 
> System Partition and 3 OS Loaders there (eLilo, GRUB2 and Windows Boot 
> Manager).
>  /EFI/Boot/GRUB/bootx64.efi
>  /EFI/Boot/eLilo/bootx64.efi
>  /EFI/Boot/Microsoft/bootx64.efi
>  I need a way to load both Boot Manager and eLilo for grub. Can you please 
> show me the example of config file?

The command to use is chainloader or similar (as opposed to the
'linux' command used to load a Linux kernel) and it takes the name of
other .efi image as the parameter. You can try it in the grub

If you want to put that in a menu look at the existing config and the
scripts in your distro that generate it. Editing the config file is
generally useless as it is usually generated by a script.

>  >
>  >
>  >
>  > ?????????????????? If it possible to exit grub with EFI ERROR to process 
> loading the
>  > next loader?
>  >
>  > Exiting grub is in itself an error, an OS loader should never end.
>  > So look for some quit command.
> Why? I think it was in old BIOS times. EFI was a boot order concept, in one 
> loader is failed, another one is trying to boot.

If the boot loader exited it has obviously not loaded any OS hence it
has failed.



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