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Re: [RFC] Support for UEFI ESP in os-prober

From: Vladimir 'phcoder' Serbinenko
Subject: Re: [RFC] Support for UEFI ESP in os-prober
Date: Mon, 1 Oct 2012 13:25:50 +0200

I haven‘t had time to view in details but os-prober isn‘t managed by us but by debian-boot team so you need to contact them. Also I‘d prefer more of detection to be done on runtime than it‘s done in current model

On Sep 29, 2012 5:04 PM, "Andrey Borzenkov" <address@hidden> wrote:
Attached are suggested implementation for UEFI support. Because ESP can
contain arbitrary number of boot entries, it is itself implemented as
extensible framework.

1. /usr/lib/os-prober/mounted/05efi

Makes basic plausibility checks (FAT and /EFI exists) and calls scripts
from /usr/lib/os-prober/mounted/efi/* to perform OS detection. Returns
detected bootladers in the form address@hidden:${long}:${short}:efi

2. patch for /etc/grub.d/30_os-prober

creates "chainloader ${path}" entry from the above

3. Patch for /usr/lib/os-prober/mounted/20microsoft

It seems that on UEFI systems Windows sometimes installs both legacy and
UEFI bootloader. In this case os-prober adds menu entries for legacy
Windows boot which do not work from within UEFI GRUB bootloader. Patch
detects UEFI platform and skips running there.

4. /usr/lib/os-prober/mounted/efi/20microsoft

Suggested implementation for Microsoft bootloader. We have no way to
create entries for individual OSes here (this would involve parsing BCD
store at the very least), so entry is titled as "Windows Boot Manager",
the same as is automatically added to UEFI boot menu.

This is successfully tested on VM with Windows 7/openSUSE 12.2 dual
boot. As openSUSE 12.2 comes with GRUB2 as default bootloader, this
issue seems to be hit by quite a number of users.



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