qemu on Kubuntu - error regarding 3dnow support.
torello at torosoft.com
Wed Jul 9 09:14:22 EDT 2008
Alle mercoledì 9 luglio 2008, Joel Stanley ha scritto:
> On Sun, Jun 29, 2008 at 1:35 AM, Kent Dahl <kentda at pvv.org> wrote:
> > I was going through the instruction on the Wiki regarding setup of qemu
> > on Linux:
> > http://wiki.laptop.org/go/Emulating_the_XO/Quick_Start/Linux
> > But once I select a boot entry (such as 'OLPC for qemu target (Full
> > size)') it fails to load the kernel with the message:
> > This kernel requires the following features not present on the
> > CPU: 3dnow
> > Unable to boot - please use a kernel appropriate for your CPU.
> I'm seeing the same.
> As of 2.6.23, if the kernel is configured with support for instruction
> set extensions, it will refuse to boot without the presence of the
> flags that indicate support for those instructions. Some digging
> revealed a patch for qemu that enables 3dnow emulation, but it
> hasn't been merged to qemu svn.
> How much do we gain from having 3DNow support turned on in the
> kernels? If the difference is small, perhaps we could disable it?
> Is booting xo images under qemu still worthwhile functionality to
> include, now that there are other options for running Sugar, as well
> higher availability of XO's for developers? If this path was
> taken, software such as grub and additional drivers could be dropped
> in return for free space on the NAND.
Having a linux kernel that run at the maximum speed is right for jffs2 image
where the target if the real device.
The ext2 image, I suppose, is oriented to be used in external device or
virtualization system. If qemu, vmware and virtualbox are not able to handle
3dnow extension, since I suppose to be run on more power system like AMD64 or
IntelCore3, I think that is better if this option is not enbaled on this
If this is wrong, I hope there is a kernel version that can be used on this
virtualization tool from the GRUB menu.
My 2 cent
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