Re: [Xen-ia64-devel] [PATCH] fix dom0 builder

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Lundi 09 Octobre 2006 02:05, Alex Williamson a écrit :
> On Fri, 2006-10-06 at 16:41 +0900, Isaku Yamahata wrote:
> > fix dom0 builder so that xen doesn't assign memory on I/O area.
>
> Hi Isaku,
>
>    Could you send a example memmory map that this patch works around?
> I'm wondering if it would be cleaner to do this earlier in the dom0 mdt
> entry creation.  HP boxes cover all possible MMIO address ranges with
> EFI memory descriptors, I'm surprised that isn't common.  Thanks,
Humm, according to ACPI spec:


14.4 EFI Assumptions and Limitations
• The firmware returns address ranges describing the current system memory 
configuration.
• The firmware does not return a range description for the memory mapping of 
PCI devices, ISA Option
ROMs, and ISA Plug and Play cards because the OS has mechanisms available to 
detect them.


I suppose we can't trust EFI memmap too much.  Sad.

Tristan.

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