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Re: Booting to local disk from UEFI_PXE booted grub

From: Holger Goetz
Subject: Re: Booting to local disk from UEFI_PXE booted grub
Date: Wed, 20 Nov 2013 17:53:23 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:26.0) Gecko/20100101 Thunderbird/26.0

On 20.11.2013 17:03, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
On 20.11.2013 16:58, Holger Goetz wrote:
On 20.11.2013 16:53, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
On 18.11.2013 09:33, Holger Goetz wrote:
Hi all,

I'm looking for the equivalent of "Local boot / boot from HD" for BIOS
mode when running in grub stared in UEFI-PXE.

With (U)EFI it's no longer easy to say, "boot from HD" as there could be
multiple bootloaders present on the EFI  System Partition (ESP).
Basically only the UEFI boot system knows which one to boot from the
"Bootorder" or "Bootnext" EFI Variable(s).
Any approach ? Or is there a way to access these EFI variables from the
grub config file?

I would just show menu entries for every available /EFI/*/*.EFI. This
woud add more flexibility.
Hi Vladimir,

Is there easy way of doing this?
That was one idea in mind which could be done based on the info from the
(U)EFI EVs to be displayed. Or it means to (1) search for the files and
(2) dynamically puzzle together a (sub) menu i guess.

Have a look at autoiso.cfg and osdetect.cfg for how to find files.
Yes - thanks. Checked that - it could be a way.

The drawback is that it basically bypasses the (U)EFI bootsystem w/ the bootorder and the labels stored w/ each bootloader entry. By retrieving the (U)EFI EVs (1) the proper sequence and (2) the proper labeling could be represented in the menu entries as well.

eg. in the default path you could find /efi//boot/bootx64.efi which could be a microsoft windows boot loader OR a renamed grub.efi ... clearer when it's a non default path like /efi/SuSE/elilo.efi or /efi/redhat/grub.efi. But you still would guess on the OS name SLES11sp3 or sp5? Having the info from the (U)EFI EVs this would be clear.



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