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

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Message-Id: <200901252239.26268.bzolnier@gmail.com>
Date:	Sun, 25 Jan 2009 22:39:25 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: Switching from (deprecated) IDE driver -> SATA (PATA support)

On Sunday 25 January 2009, Justin Piszcz wrote:
> 
> On Sun, 25 Jan 2009, Bartlomiej Zolnierkiewicz wrote:
> 
> > On Sunday 25 January 2009, Justin Piszcz wrote:
> >> When switching (removing IDE support) in favor of the new PATA support
> >> under the SATA menu, is there any best practice/or method of knowing what
> >> the new root hdd will be upon reboot?
> >>
> >> Example:
> >> If I have 10 sata disks and 2 IDE disks on various cards/controllers, how
> >> do I know /dev/hda will become /dev/sda?  In one test on a system I have
> >> here, /dev/hda became /dev/sdb2 after reboot, not an issue if the box is
> >> local, but if the box is remote, how do you cope with this?  I ask now
> >> because some IDE drivers have been removed (nvidia I believe? in 2.6.28)
> >> and I cannot upgrade the kernel anymore unless I move to the
> >> PATA-supported SATA driver, but I have no idea what the root disk will be
> >> after a reboot and there is a high probability it will not come back after
> >> a reboot..
> >
> > Hmmm?  That's news to me and I wonder where did you hear that?
> >
> > The only driver that got removed recently was HPT34X (for very, very
> > old HPT controllers) which was broken for ages.  In reality we are
> > adding new IDE host drivers and not removing them.
> >
> > In 2.6.28 we got support for TX4938 and TX4939 chipsets.  2.6.29-rc1
> > contains a new driver for IT8172 and 2.6.29-final will hopefully have
> > drivers for AT91 and CS5536 chipsets.  Moreover except CS5536 all of
> > above chipsets are not support in other ways under Linux...
> >
> > While we are at it 2.6.29 also got a whole bunch of updates to the core
> > IDE code -- this includes complete rewrite of locking scheme (which
> > is now superior to some other solutions), latency improvements for IRQ
> > handling and port of ide-cd over generic ATAPI support (not to mention
> > whole stack of bugfixes and cleanups).
> >
> > Thanks,
> > Bart
> >
> > PS as usual I encourage people to try different solutions and choose
> > whatever works best for them (please also remember that giving feedback
> > is very important if you want to see some things improved).
> >
> 
> Correction, it was the HPT controller as you noted, broken? Was working 
> for me in 2.6.26.3 :)
> 
> CONFIG_BLK_DEV_HPT34X=y
> # CONFIG_HPT34X_AUTODMA is not set
> CONFIG_BLK_DEV_HPT366=y

HPT34X driver got removed not HPT366.

However if you need we can bring support for HPT34x hardware back. :)
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