linux-kernel - Re: Switching from (deprecated) IDE driver -> SATA (PATA support) (found solution (scratch that))

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Date:	Sun, 25 Jan 2009 16:15:16 +0300
From:	Michael Tokarev <mjt@....msk.ru>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: Switching from (deprecated) IDE driver -> SATA (PATA support)
 (found solution (scratch that))

Justin Piszcz wrote:
> 
> On Sun, 25 Jan 2009, Justin Piszcz wrote:
>> On Sun, 25 Jan 2009, Justin Piszcz wrote:
>>> On Sun, 25 Jan 2009, Justin Piszcz wrote:
>>>> On Sun, 25 Jan 2009, Justin Piszcz wrote:
>>>>> On Sun, 25 Jan 2009, Justin Piszcz wrote:

Wow, that's quite some ping-pong!.. ;)

[]
> Hm, I may have spoke too fast:
> 
> Added: (IDE ONLY), no SATA:
> image=/boot/2.6.26-6
>         label=2.6.26-6
>         read-only
>         root=current
> 
> p254:/boot# lilo
> Added 2.6.26-6 *
> Added 2.6.28-4
> p254:/boot#
> 
> Set to current.
> 
> p254:/boot# grep =current /etc/lilo.conf
> root=current
>         root=current
> p254:/boot#
> 
> The reason current may have worked before is because I manually booted with
> root=/dev/sdd2 (after I saw the error that it could not find root,302, etc)
> 
> So I am booting the old kernel without the SATA drivers with root=current
> to see if it works..
> 
> Nope, so I need to figure out how to get the UUID= option working in LILO.

There's no way without using initramfs.  Lilo only records the unix device
number (like 8:1 for /dev/sda1) and passes it to kernel (replacing `current'
with that number).  But for different kernels (IDE vs PATA drivers) the
number will be different.  Lilo itself - when booting at least - can not
know which device it will be.

The only universal solution is to use smart initramfs that will populate
/dev/disk/by-label/ etc (using udev maybe).

Another solution is to explicitly specify root=/dev/sda1 or root=/dev/hda1
when using pata- or ide-enabled kernels, in lilo.conf.

/mjt
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