Re: system emulation booting elf files [was: Re: [Qemu-devel] Open Hack'Ware question]

[Karel Gardas]

On Sat, 16 Jul 2005, Natalia Portillo wrote:

> Use the -kernel command line option to supply the ELF executable to
> boot.
>
> In OHW there is a known problem that surely will prevent doing that
> in QEMU System PPC, but in QEMU System x86 it should work without
> problem.

Are you sure it should really work? The problem is that -kernel option 
requires -hda option to be supplied, if I understand sources well, it uses 
it to load disc partition table into memory. Also the kernel binary 
supplied is "normal" zImage, which means it contains x86 boot sector, 
which makes me curious if the boot sector is really used or not.

Anyway, if I try this:

silence:~/cvs/rtems/examples/hello_world_c/o-optimize$ qemu -kernel ./hello.exe 
-hda /images/rtems.img

where rtems.img is the hardisk image where I store some rtems examples, 
then Qemu only prints usual messages and ``Booting from Hard Disc...'' and 
that's all, nothing more and just consume 100% CPU.

Thanks,
Karel

> El 15/07/2005, a las 21:17, Karel Gardas escribió:
>
> > On Thu, 14 Jul 2005, Brian Wheeler wrote:
> >
> >
> > > On Thu, 2005-07-14 at 17:52 +0200, Karel Gardas wrote:
> > >
> > > > On Thu, 14 Jul 2005, Brian Wheeler wrote:
> > > >
> > > >
> > > > > All of the websites that are referred to in the docs and source are
> > > > > missing.  Is there another place to get it?  I'm tinkering with
> > > > > the idea
> > > > > to try to boot aix on qemu.
> > > >
> > > > The same here! But for RTEMS and Mesquite cPCI (MCP750) BSP.
> > > >
> > > > Any idea how to get such code booting? IMHO the best would be to use
> > > > Qemu's -kernel option, but I don't know what are precise
> > > > requirement for
> > > > it and for image booting in this scenario.
> >
> > I've thought about it a little bit, but since I'm not system
> > programmer, I'm a bit lost. RTEMS executables (whole system image)
> > are ordinary elf files:
> >
> > silence:~/cvs/rtems/examples/hello_world_c/o-optimize$ file hello.exe
> > hello.exe: ELF 32-bit LSB executable, Intel 80386, version 1
> > (SYSV), statically linked, stripped
> > silence:~/cvs/rtems/examples/hello_world_c/o-optimize$
> >
> > (i.e. hello.exe is whole RTEMS kernel and user app built together)
> >
> > for example GRUB is able to boot such file and when booting it
> > prints something like:
> > [Multiboot-elf, <0x100000; 0x4e538:0xbe28  (and probably something
> > other
> >                                            which I've not caught
> > since
> >                                            RTEMS booted quickly)
> >
> > So what's IMHO needed is just elf load such file and start it.
> > Perhaps here is possible to use em86/qemu's elfload functionality
> > and instead of linux-user more hook this into the system mode.
> >
> > Any idea how to proceed? (or where exactly to start?)
> >
> > Thanks!
> > Karel
> > --
> > Karel Gardas                  address@hidden
> > ObjectSecurity Ltd.           http://www.objectsecurity.com
> >
> >
> > _______________________________________________
> > Qemu-devel mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/qemu-devel
>
>
>
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> BF3BA6E4
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--
Karel Gardas                  address@hidden
ObjectSecurity Ltd.           http://www.objectsecurity.com