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Re: [Xen-devel] Re: vt-d p7p55d evo: Success

To: listmail <listmail@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: vt-d p7p55d evo: Success
From: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
Date: Mon, 12 Apr 2010 15:24:38 +0200
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Mon, 12 Apr 2010 06:25:57 -0700
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Am 12.04.2010 schrieb listmail:
> Dietmar Hahn wrote:
> >> - How did it work.. did you have some issues?
> >> the nv driver on linux works fine (as good as it can)
> >> it takes a bit before you see VGA output on boot
> >>     
> >
> > Did you see any boot messages of the BIOS / grub
> > on the console device (with this gfx adapter) before the linux
> > kernel boot messages and the X11 screen?
> >   
> No output only appeared some time after the kernel had already started.  
> I wasn't sure what to expect here.  Would there be any more useful 
> information to provide?

I only wanted to know whether your vga-bios works well, but it didn't seem
so, otherwise you would see some messages from the bios and if you have
the grub bootloader maybe to select a kernel to boot in the domU.

> >> the console cursor was positioned higher than normal (sitting at over 
> >> the halfway mark for the font)
> >> shutdown of Xorg can leave you with a blank console
> >> shutdown then Restart of domU without restarting dom0 may lead to no VGA 
> >> output, however you can still ssh in and startx (Xorg) and it will 
> >> produce output
> >>     
> >
> > This is the same behavior as on my laptop where the copied VGA-BIOS not
> > works in the domU (beside no FLR - see flag FLReset-).
> >
> > Dietmar.
> >   
> It is copied directly from the card just before domU starts right?

No it's copied from the dom0 kernel memory to the domU physical memory.

> I read something about that the card's bios can change after it first 
> initialized when the computer starts, is there an option to test using a 
> file based copy of the bios?

To load the vga-bios from a file you have to change the hvmloader (there is
already some code about this) and must compile it on your own.


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