linux-kernel - Re: [PATCH 2/3] ide: fix drive_is_ready() for non-PCI hosts and CONFIG_IDEPCI_SHARE

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Date:	Fri, 26 Oct 2007 12:53:55 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ide: fix drive_is_ready() for non-PCI hosts and
 CONFIG_IDEPCI_SHARE_IRQ=y

On Thu, 25 Oct 2007 20:42:16 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> Alan Cox wrote:
> > On Fri, 26 Oct 2007 01:36:37 +0200
> > Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
> > 
> >> Need to check if the host is a PCI one before reading IDE_ALTSTATUS_REG.
> >>
> >> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > 
> > Umm why ? The altstatus register goes back to ST-506 and the original IBM
> > XT hard disk controller card ?
> 
> I'm pretty sure there are at least a few controllers out there where the 
> AltStatus/Control register block is simply non-existent.

One or two of the commode Amiga controllers did this. Makes error
recovery rather interesting. The register itself is however present even
on things like the WD10xx devices.

Alan
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