Re: [Xen-devel] IOMMU and AMD 890fx

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hi Joerg,

When i look online in the manual for the  ASUS Crosshair IV, i don't see any 
mention of IOMMU.
Not in the speficication list, and not in the bios option screenshots (only the 
SVM option is mentioned).

Is there someone within AMD that has contact with motherboard manufacturers(and 
the bios makers) that could address this issue with them ?

--
Sander

Thursday, June 3, 2010, 1:26:49 PM, you wrote:

> Hello Jens,

> On Thu, Jun 03, 2010 at 12:51:23PM +0200, Jens Krehbiel-Gräther wrote:
>> 
>> I got this answer from asrock support:
>> 
>> <answer>
>> So, I get more/final answer from Taiwan department:
>> 
>> For H/W part:
>> >From chipset spec, RD890(890FX) did support IOMMU.
>> But IOMMU also need CPU to support.

> Thats wrong. The IOMMU is a feature of the chipset northbridge and does
> not need additional cpu support.

>> Till now, AMD has no plan to support
>> IOMMU on desktop CPU (AM3 socket).

> There are AM3 boards out there with server a chipset that have it
> enabled. Its no question of a socket.

>> It only support with server CPU.

> Also wrong. I have seen systems with desktop cpus that have IOMMU
> enabled (Phenom X4 and Phenom X6).

>> For BIOS part:

>> AMD has removed IOMMU related registers.

> Hard to believe. I have found people in the net who say that the ASUS
> Crosshair IV mobo has IOMMU support in the BIOS. So if they can enable
> it, asrock can do that too. Its just the BIOS which has to enable it

>> So they say it is AMD's fault. :-(

> I doubt that.

>         Joerg




-- 
Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx


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