Re: cross compiling kvm

["Gerd Koenig" <gerd.koenig-2UyDCMiLNfhBDgjK7y7TUQ@public.gmane.org>]

Hi Jerone,

On Monday 26 November 2007, Jerone Young wrote:
> On Mon, 2007-11-26 at 11:57 +0100, Gerd Koenig wrote:
> > hello,

> > Which is the first version of kvm, which is considered to be able to
> > cross compile?
>
> It would be one of the newer versions. I started to sending cross
> compile stuff probably around kvm-47 timeframe (I barely remember).
> Definitely not kvm-28 though.
>
thanks for the info! So I will continue to work with kvm-53. The thing is, 
that some people say, that it is necessary to use a patched version of KVM by 
using it with the realtime preemption patches. But this is an issue I will 
investigate after a successful installation of kvm on our target.

> > Of course, it can be possible, that I do something totally wrong.
> >
> > This is my configure call:
> > ./configure --arch=i386
> > --cross-prefix=/opt/crosstool/i686-pentium-linux-gnu/\
> > gcc-3.4.3-glibc-2.3.3/bin/i686-pentium-linux-gnu- \
> > --kerneldir=/home/gerdko/thinkiod_work/linux --disable-vnc-tls \
> > --prefix=/home/gerdko/thinkiod_work/install
> >
> > you might ask, why I use a cross compiler for x86? Well, I want to use
> > kvm on an embedded device, which doesn't have local gcc installed, so I
> > need to compile everything on another host.
>
> I have found that your going to want to add "--with-patched-kernel" to
> your command line also.
>
Why is this so? I understood, if I want to compile the kvm package, including 
the kernel modules, I don't have to use the "--with-patched-kernel". Am I 
wrong? I'm a bit puzzled at the moment, as it seems, that 
the "--with-patched-kernel" switch is incompatible with "--kerneldir" ??
kerneldir is a path to my patched 2.6.21.6-rt21 preemptible-kernel for our 
target, by the way.

>
> To solve your SDL issue you probably want to cross compile a version SDL
> in a directory .. then add to the --qemu-cflags option &
> --qemu-ldflags. Same whould go for stuff like ZLib.
>
yes, I did so. And it seems to work.
But there is still a problem with the configure script, as it assumes to 
search for sdl-config on the development host. A minor problem though and 
easy to fix... 
I could send a patch afterwards, when I found a common solution...

>
> ./configure --arch=i386
> --cross-prefix=/opt/crosstool/i686-pentium-linux-gnu/\
> gcc-3.4.3-glibc-2.3.3/bin/i686-pentium-linux-gnu- \
> --kerneldir=/home/gerdko/thinkiod_work/linux --disable-vnc-tls \
> --prefix=/home/gerdko/thinkiod_work/install \
> --with-patched-kernel \
> --qemu-cflags="--static -I <SDL_DIR>/include -I <zlib_dir>/lib" \
> --qemu-ldflags="-L <SDL_DIR>/lib -L <zlib_dir>/include"
>
> Another thing that you need to sneak in is that your going to need is
> adding "--static" flag into the qemu compilation (which I do in
> --qemu-cflags in the example).
>
> Cross compiling qemu is a little bit of a pain.due to the external
> dependencies. But it is possible.
phew. yes it is ;-)


> Hope that helps.
thank you!

greetings,
gerd

Kontron Modular Computers GmbH
Geschaeftsfuehrer / Managing Directors: Ulrich Gehrmann, Thomas Sabisch 
Sitz der Gesellschaft / Registered Office: Kaufbeuren, Rechtsform / Legal: GmbH 
Amtsgericht / Local District Court Kempten, HRB Nr. / Trade Register No. 6195
 


-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/