RE: pgprot_writecombine & shub 1.x

Bjorn Helgaas
2005-01-19T19:33:07Z

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.