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List:       linux-ia64
Subject:    RE: pgprot_writecombine & shub 1.x
From:       Bjorn Helgaas <bjorn.helgaas () hp ! com>
Date:       2005-01-19 19:33:07
Message-ID: 1106163187.15061.21.camel () eeyore
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On Wed, 2005-01-19 at 10:38 -0800, Luck, Tony wrote:
> >> Does the EFI memory map help here?  Is I/O memory included
> >> in the efi memory map?  What about the hot-plug case ... the
> >> EFI memory map isn't updated for new i/o memory that appears
> >> when you plug in a new card?
> >
> >I think it's supposed to appear as memory mapped I/O or memory 
> >mapped I/O port space in the EFI memory map.  Shouldn't the map
> >be updated in the case of hotplug?
> 
> I'm not an EFI expert ... but it looks like the i/f to get the
> memory map is only part of the boot time services, not the runtime
> services.  If that's right, then I don't think there's a way for
> it to be updated.

That's correct.  The EFI memory map is only a boot-time interface.
You have to learn about hot-plug stuff via ACPI.

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