[Xen-users] Re: VT-D RMRR is incorrect

[Christian Tramnitz <chris.ace@xxxxxxx>]

Dustin,

I couldn't really get what you were trying to say (I never mentioned 
AMD...) but anyway this isn't really Linux specific it's a BIOS bug. 
Unfortunately the only way to get in contact with that bug is to either 
use Xen or enable DMRR in the vanilla Linux kernel. If this cannot be 
fixed in software I'll probably return the board to the store and get an 
Intel DX58SO instead...

Yoshiharu, have you tested Xen-unstable yet? When commenting out the 
EFAULT you mentioned I get an immediate panic related to the rmrr 
address conflict on the latest 3.4-unstable tree.

@Xen devs: Is this something that could be worked around in Xen or do we 
really have to rely on exact RMRR values for vtd to work?
See http://permalink.gmane.org/gmane.comp.emulators.xen.user/43937 for 
more details.

Thanks,
   Christian

Dustin Henning schrieb:
>         I would recommend opening a new ticket with ASUS and telling them
> you were running Windows if you can get the same output Yoshiharu-san did
> and it fails to meet AMD specifications the way his fails to meet Intel
> specifications, after all, that would mean their board was out of spec with
> AMD, not Linux.  However, in my experience, ASUS can't fix anything (I tried
> to be an early adopter of the SiI port multiplier via their P5WD2-Premium
> onboard SiI SATA and a port multiplier from someone else, after all, their
> documentation clearly stated that they supported port multipliers, and they
> didn't make their own, however, it wouldn't work with port multipliers, they
> "escalated it to their engineering," and I never heard back, so the issue
> was never resolved).  I'd recommend going with Gigabyte or SuperMicro,
> because I've had equally bad support from MSI (I have several computers
> whose systems monitoring software goes off continuously until reboot after
> using a floppy drive, that would have to be a firmware issue, and they can't
> fix it).  All the other manufacturers are either awfully new to the market
> or awfully unreliable (Biostar, for instance, isn't likely to have a board
> last much longer than their warranty in my experience, regardless of
> platform), SuperMicro would probably be the better bet compatibility wise,
> but they have a short warranty and less features (read: less additional
> features that probably don't work with Linux anyway).  Good luck finding
> something that works, be sure to let everyone know what it is.
>         Dustin

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