linux-kernel - Re: [PATCH]PCI:disable resource decode in PCI BAR detection

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Message-ID: <20070917132005.A21399@jurassic.park.msu.ru>
Date:	Mon, 17 Sep 2007 13:20:05 +0400
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Greg KH <gregkh@...e.de>, Matthew Wilcox <matthew@....cx>,
	Shaohua Li <shaohua.li@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-pci <linux-pci@...ey.karlin.mff.cuni.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH]PCI:disable resource decode in PCI BAR detection

On Sun, Sep 16, 2007 at 11:34:35AM -0600, Robert Hancock wrote:
> > The most interesting fact there is that windows *does not* clear
> > PCI_COMMAND_MEMORY bits during PCI bus enumeration, so BIOS writers
> > have to rely on that. Yet another reason why your patch is unsafe.
> 
> Windows 98 doesn't, it says. That doesn't say anything about what newer 
> versions of Windows are doing (like Vista, which is the first to 
> actually use MMCONFIG).

But we're not going to drop support for hardware "designed for Windows 98",
aren't we?

> Check the code. We have a quirk to handle this, in 
> drivers/usb/host/pci-quirks.c

It doesn't help. It's a "final" fixup, so it runs much later than BAR sizing.

Ivan.
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