Re: [Qemu-devel] [PATCH] Add multi-boot kernel loading support

[Rene Rebe]

Hi,

On 03.02.2009, at 15:31, Kevin Wolf wrote:

> Rene Rebe schrieb:
> > Hi,
> >
> > Kevin Wolf wrote:
> > > Rene Rebe schrieb:
> > > > Hi all,
> > > >
> > > > Alexander Graf implemented multi-boot kernel loading during
> > > > his work to run Darwin inside Qemu/KVM. As the boot loader
> > > > expects to load the kernel in an EFI environment a custom
> > > > booter is used to load the kernel using a legacy BIOS.
> > > >
> > > > This is a port of the patch to the new extload / INT 19
> > > > machinery (including minor cleanups).
> > >
> > > The memory map doesn't seem to work. It's all zeros for me (haven't
> > > looked for the reason yet) and that kills my kernel. When I  
> > > disable the
> > > memory map part, the kernel seems to boot correctly and it sees  
> > > all the
> > > modules with the right command lines.
> > >
> > > Once these basic things work, another nice feature would be gzip
> > > support. It took me some minutes until I realized that I tried to  
> > > feed
> > > it a gzipped kernel which didn't work, of course.
> >
> > I think I noticed the same with the GRUB example kernel. I'll
> > take a look at some later hour.
> >
> > Is your kernel something you can share for testing?
>
> Sure. I tried it with with several homebrew kernels from
> http://lowlevel.brainsware.org/wiki/index.php/Kategorie:Betriebssystem
> (page is in German) - to be precise it was tyndur, meinOS, Xantorix  
> and
> lightOS. Links to the sources and/or binaries for each one are in the
> respective Wiki articles.
>
> I could also send you a tarball with all of them off-list if you like.


From reading the last mails I thought you would have your own kernel.

I now have the mmap, memory sizes (kB, not Bytes) fixed and some
other comments from the list taken into account (ARRAY_SIZE, etc.).

  http://svn.exactcode.de/t2/trunk/package/emulators/kvm/09-qemu-multiboot.patch

As I did not yet feel like extracting all the kernels and their modules
from the cited disk / floppy images so it's not yet tested with those
"homebrew" kernels.

Further comments welcome,

--
  René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
  http://exactcode.de | http://t2-project.org | http://rene.rebe.name