RE: [Xen-devel] iommu support on AMD64

["Langsdorf, Mark" <mark.langsdorf@xxxxxxx>]

 On Thu, 2005-09-29 at 15:26 -0500, Langsdorf, Mark wrote:
> > > Langsdorf, Mark wrote:
> > > > I'm working on getting IOMMU support enabled
> > > > for AMD64 in Xen.
> > > > 
> > > > The current aperture.c code in dom0 requires
> > > > several calls to read_pci_config() to find
> > > > the AMD northbridge.  These calls are causing
> > > > my system to crash.
> > > 
> > > Can you be more specific (output from serial connection, for
> > > example)? The outl instruction causes #GP, and the emulator 
> > > in Xen handle it. So, it's possible the emulator has a bug?
> > 
> > The serial console is pretty broken on AMD64.  I was
> > hoping to not have to debug the serial console in
> > order to fix the IOMMU problem.
> 
> Do you mean on your machine? Serial console works fine on my 
> AMD64 boxes.
> 
> Try this in your grub.conf:
> 
> title Xen
>         kernel /boot/xen.gz dom0_mem=512000 acpi=off 
> com1=19200,8n1,0x3f8,4 console=com1 verbose=y sync_console
>         module /boot/vmlinuz-2.6.12-xen0 root=/dev/sda1 debug=y
>         module /boot/initrd-2.6.12-xen0.img

Thanks!  That works.

-Mark Langsdorf
AMD, Inc.


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