linux-kernel - Re: libata-pata with ICH4, rootfs

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Message-ID: <20061214195314.GC10955@nostromo.devel.redhat.com>
Date:	Thu, 14 Dec 2006 14:53:14 -0500
From:	Bill Nottingham <notting@...hat.com>
To:	Alistair John Strachan <s0348365@....ed.ac.uk>
Cc:	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: libata-pata with ICH4, rootfs

Alistair John Strachan (s0348365@....ed.ac.uk) said: 
> > > Is it possible to use pata_mpiix (or pata_oldpiix) with an ICH4 IDE
> > > controller and boot off it?
> >
> > ata_piix (the SATA/PATA driver) deals with the ICH4. pata_mpiix is
> > specifically for the Intel MPIIX laptop chipset and pata_oldpiix
> > explicitly for the original PIIX chipset and none of the later ones.
> 
> Correct me if I'm wrong, but SATA wasn't available on ICH4. Only 5 and 
> greater. The kernel help text agrees with me.
> 
> My IDE controller usually works with CONFIG_BLK_DEV_PIIX; I was interested in 
> using your pata_xxx drivers in replacement, assuming there was support.

pata_xxx is for older PIIX, not ICH4. ICH* is handled by ata_piix, which
can drive both SATA *and* PATA in the new kernels. In fact:

[notting@...tromo: ~]$ lspci | grep IDE
00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller (rev 01)
[notting@...tromo: ~]$ dmesg | grep ata
...
ata_piix 0000:00:1f.1: version 2.00ac6
ata1: PATA max UDMA/100 cmd 0x1F0 ctl 0x3F6 bmdma 0x1860 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x1868 irq 15
...
[notting@...tromo: ~]$ uname -r
2.6.19-1.2839.fc7

Bill
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