linux-kernel - Re: [PATCH 2.6.18] PCI: Turn pci_fixup_video into generic for embedded VGA

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Date:	Fri, 16 Mar 2007 11:42:39 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	eiichiro.oiwa.nm@...achi.com, akpm@...l.org, tony.luck@...el.com,
	greg@...ah.com, "Alan Cox" <alan@...rguk.ukuu.org.uk>,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.18] PCI: Turn pci_fixup_video into generic for embedded VGA

On Friday, March 16, 2007 10:20 am Bjorn Helgaas wrote:
> Are there really ia64 machines where we need to use the option ROM
> copy at 0xC0000?  If so, is this documented somewhere?  I couldn't
> find any mention in DIG64, EFI, or internal HP architecture specs.
>
> If we do need to use it, ia64 has a bit of a problem because on some
> boxes, the 0xC0000 memory supports only cacheable access, the VGA
> frame buffer at 0xA0000 supports only uncacheable access, and the
> usual ia64 ioremap mapping is a 16MB page that covers both.

Apparently Eichiro's machine needs it, and of course there are i386 and 
x86_64 machines that need it to, so it makes sense that it be generic.

Jesse
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