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From: eiichiro.oiwa.nm@hitachi.com
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To: "Jesse Barnes" <jesse.barnes@intel.com>
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Subject: Re: [PATCH 2.6.18] PCI: Turn pci_fixup_video into generic for
    embedded VGA
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>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