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

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Message-ID: <XNM1$9$0$4$$3$3$7$A$9002870U45fdffb3@hitachi.com>
Date:	Mon, 19 Mar 2007 12:12:55 +0900
From:	eiichiro.oiwa.nm@...achi.com
To:	"Jesse Barnes" <jesse.barnes@...el.com>
Cc:	"Bjorn Helgaas" <bjorn.helgaas@...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
>

Yes, our machine need it.

>> 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.

"System Abstraction Layer Specification" describes it in section 2.6.

Eiichiro

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