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Re: Re: Grub2 on UEFI

From: gburanov
Subject: Re: Re: Grub2 on UEFI
Date: Fri, 29 Jan 2010 13:45:17 -0500

>  /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
> commandline.
> 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.

Thanks I will try chainloader and write about results later! About the script 
that generates menu - actually speaking I don't have a distro =) I need grub to 
load small kernel with ramdisk - that do specific actions and quit, they don't 
have functionality to edit config file, so I need to do it by myself.

>  >
>  >
>  >
>  > ?????????????????? 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.

Here I disagree. In old BIOS times we got only one try to load OS - the MBR got 
the jump to the loader (lilo, grub, ntldr, whatever), and if the loader fail - 
the whole booting it failed (however loader can "pass" execution to another 

Now, EFI has the concept or order  of loaders. The EFI firmware loader has a 
list of loaders, if the first one (say grub) is failed, it will try next one 
(say Windows Boot Manager). So, Windows Boot Manager is executed by EFI 
Firmware loader, not by the grub>
> ยท         What about  device names in grub2 for EFI? The problem  is that
> old device names were based on BIOS device names, and it seems that in EFI
> it's not the same. For example, what disk is hd0?
> Unfortunately, the disk order is firmware specific and nothing can be
> done about that. You should look at disk content or use UUIDs.

Please, I need more info on it =)
How can I identify the disk using disk content or UUID.

For example, I got my kernel on NTFS partition and now smth like


is written in grub config. Imagine that new disk is inserted oor new partition 
is created, the booting will fail. For example I need to examine all partitions 
and if one has a dir structure /Loader/Kernel/vmlinux and/or UUID ... - load 
the kernel. How can I do that? I can't find mych information on the topic

Thanks in advance,

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