linux-kernel - Re: Please revert: PCI: fix IDE legacy mode resources

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Message-ID: <20071210154732.GB19384@linux-mips.org>
Date:	Mon, 10 Dec 2007 15:47:32 +0000
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	benh@...nel.crashing.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: Re: Please revert: PCI: fix IDE legacy mode resources

On Mon, Dec 10, 2007 at 03:01:26PM +0000, Alan Cox wrote:

> > It seems the whole MIPS resource managment is complicated enough (out of
> > necessity) that only a few people actually grok it.  Ioports being
> > actually memory mapped on MIPS only makes the confusion worse, sigh.
> 
> If the hardware cannot map the low PCI space then set
> CONFIG_NO_ATA_LEGACY and the ATA layer will leave legacy ports alone.
> Unfortunately its not clear we can make that mode try and force
> controllers into native. We could try that if the MIPS and PPC people
> want ?

It sounds like a reasonable thing to try at this stage.

this btw is the lspci -v output for the IDE controller from a recent Cobalt
kernel:

> 0000:00:09.1 IDE interface: VIA Technologies, Inc.
> VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
> (prog-if 8a [Master SecP PriP])
>         Flags: bus master, fast Back2Back, medium devsel, latency 64
>         I/O ports at 1820 [size=16]

And that's lspci -v -b:

> 0000:00:09.1 IDE interface: VIA Technologies, Inc.
> VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
> (prog-if 8a [Master SecP PriP])
>         Flags: bus master, fast Back2Back, medium devsel, latency 64
>         I/O ports at 10001820

So the IDE controller already seems to be in native mode?

   Ralf
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