Re: [kvm-devel] Extboot Option Rom rewritten in C

[Nguyen A. Q. <aq...@gm...>]

On 4/15/08, Anthony Liguori <ali...@us...> wrote:
> Nguyen Anh Quynh wrote:
>
> > On 4/15/08, Anthony Liguori <ali...@us...> wrote:
> >
> >
> > > Hi Nguyen,
> > >
> > >  Nguyen Anh Quynh wrote:
> > >
> > >
> > >
> > > > Hi Anthony,
> > > >
> > > > I spot a bug and few dead code in the extboot option rom. Perhaps the
> > > > reason they are there is because less people want to look at assembly
> > > > code, and it looks indeed scary.
> > > >
> > > > So I decided to rewrite it in C, using .code16gcc directive. Some
> > > >
> > > >
> > > advantages:
> > >
> > >
> > > > - C code is easier to understand, find bugs, maintain and hack (so we
> > > > can add more features in the future)
> > > > - The binary image is same: 1.5K. The actual code size is also about
> > > > the same size: around 1.2K. (gcc can optimize really well)
> > > >
> > >  I think converting to code16gcc is a good direction to go in.  I
> actually
> > > rewrote it myself using code16gcc but I ran into problems with segment
> > > assumptions and Windows guests.  I tried out your version with a Linux
> guest
> > > with good success but it fails with a win2k guest.
> > >
> > >  Have you tested with a Windows guest?
> > >
> > >
> >
> > Not yet. Last time I tried, the Windows virtio drivers posted a while
> > ago dont work with my WinXP. I will try again, though.
> >
> >
>
>  I just test with scsi, not virtio.
>
>  You should be able to get very far along the Windows boot process with
> extboot.  If you just install the LSI driver in Win2k, you can boot up
> completely.  Someone just posted instructions for doing scsi boot with
> Windows XP assuming you installed the VM from IDE.
>

I searched around for those scsi boot instructions, but dont see any.
Any pointer?

Thanks,
Q