linux-kernel - Re: Matching hard disks to BIOS boot order

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Message-ID: <20090612085341.04ffcae2@lxorguk.ukuu.org.uk>
Date:	Fri, 12 Jun 2009 08:53:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Harvey Chapman <hchapman-linux-kernel@...p.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Matching hard disks to BIOS boot order

On Fri, 12 Jun 2009 00:26:16 -0400
Harvey Chapman <hchapman-linux-kernel@...p.com> wrote:

> Is there a way to figure out which hard disks match the BIOS boot order?
> 
> I'm trying to tell a Linux program which disk to use based on the disk 
> numbers (0,1,...) used by Windows. The best solution I've found so far 
> is disk serial number, but that hasn't been terribly reliable for other 
> reasons.

There is a BIOS interface for this on newer systems, although the kernel
doesn't capture enough data to make it completely reliable below EDD 3.0
(in theory if we grabbed a few more bits we could do EDD 1.x as well)

Most PCs today do EDD 3.0 however

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