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Date: Wed, 31 Dec 2008 13:07:47 +0100
From: Mikael Pettersson <mikpe@it.uu.se>
To: Jan De Luyck <ml_linuxkernel_20080830@kcore.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.28 - cannot find root fs on Acer TM 291 (ICH4-M)
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Jan De Luyck writes:
 > Hello list,
 > 
 > I've been a happy user on my desktop system of 2.6.28 since it's been released,
 > but I seem to have hit a snag on my laptop. Can't get it to boot, keeps
 > panicking with a VFS: cannot open root device "hda3" or unknown-block(0,0)
 > 
 > I've tried several configurations, starting off the last kernel built for the
 > machine (2.6.25.16). I've selected the PIIX IDE driver (no SATA here), tried
 > with and without the advanced partition schemes, but I can't get it to boot.
...
 > #
 > # Automatically generated make config: don't edit
 > # Linux kernel version: 2.6.28
 > # Wed Dec 31 11:46:21 2008
...
 > CONFIG_HAVE_IDE=y
 > CONFIG_IDE=y
 > 
 > #
 > # Please see Documentation/ide/ide.txt for help/info on IDE drives
 > #
 > CONFIG_IDE_ATAPI=y
 > # CONFIG_BLK_DEV_IDE_SATA is not set
 > # CONFIG_IDE_GD is not set

You need to enable IDE_GD and IDE_GD_ATA.

But I recommend that you switch to libata instead (with ata_piix driver).