32 bit kernel on 64 bit machine

[erkrishna@gmail.com (er krishna)]

On Apr 20, 2012 12:41 PM, "Graeme Russ" <graeme.russ@gmail.com> wrote:
>
> Hi Krishna,
>
> On Fri, Apr 20, 2012 at 2:37 PM, er krishna <erkrishna@gmail.com> wrote:
> >
> > On Apr 20, 2012 12:16 PM, "Graeme Russ" <graeme.russ@gmail.com> wrote:
> >>
> >> Hi Krishna,
> >>
> >> Please keep ML Cc'd
> > yep
> >
> >>
> >> On Fri, Apr 20, 2012 at 1:57 PM, er krishna <erkrishna@gmail.com>
wrote:
> >> > Graeme,
> >> >
> >> > Thanks for the reply.
> >> >
> >> > On Fri, Apr 20, 2012 at 11:49 AM, Graeme Russ <graeme.russ@gmail.com>
> >> > wrote:
> >> >>
> >> >> Hi Krishna,
> >> >>
> >> >> On Fri, Apr 20, 2012 at 1:45 PM, er krishna <erkrishna@gmail.com>
> >> >> wrote:
> >> >> > Hi All,
> >> >> >
> >> >> > Is it possible to boot the 64 bit machine through 32 bit compiled
> >> >> > kernel
> >> >> > ? I
> >> >>
> >> >> Yes
> >> >
> >> >
> >> > How ? What are the exact steps ? I mean how I will compile the kernel
> >> > (flags
> >> > and all) that will boot on 64 bit processor ? My problem is I have 64
> >> > bit
> >> > fc16 and Sandybridge 64 bit machine. I need to compile the kernel
for 32
> >> > bit
> >> > with these setup and boot it.
> >>
> >> The steps you performed I believe will have built a 32-bit kernel
> > yes but when booted it panic during initramfs stage.
>
> Is the initramfs the Fedora init ramfs? If so, maybe it has 64-bit user
space

Yes and maybe it can b the problem. Let me do a lil bit more debugging and
then I will back on this. Thx for the kind suggestion.
>
> >> >> > tried its compilation on fedora 16 64 bit and intel sandybridge 64
> >> >> > bit
> >> >> > with
> >> >> > following option:
> >> >> >
> >> >> >
> >> >> > $ make ARCH=i386 menuconfig
> >> >> >
> >> >> > $ make ARCH=i386 ?j4
> >> >> >
> >> >> >
> >> >> > but it failed to boot. Any suggestion if it can be done by any
way.
> >> >>
> >> >> You cannot use a 32-bit kernel with 64-bit user-space
> >> >>
> >> >
> >> > Sorry, I didn't get you here. Do you mean to say that 64 bit
application
> >> > won't work on 32 bit kernel. if its then its fine.
> >>
> >> Yes, that is what I mean't - If all you userspace (libraries,
> >> applications etc) are 64-bit then a 32-bit kernel cannot run them. You
> >> should have at least got a kernel panic that init could not be run
> >>
> > application will not run that i m agreed but the booting should be
smooth.
> > Isnt it?
> >
> > I got panic during early stage of booting before calling of init.
>
> Can you post a log? You'll need to setup logging to serial or net console
>
> >> By 'fine' you mean that your setup is fine and you tried to run the
> >
> > No it was not intended to say like this.  But first of all booting didnt
> > happen.
> > So there is no point of trying any application.
> >
> > Can you pls tell that booting and 32 bit application should run
smoothly?
> >
> >> 32-bit kernel using 32-bit userspace? If so, there is obviously
> >> another problem.
> >
> > Watt problem?
>
> I would say the initramfs contains 64-bit user-space
>
> Regards,
>
> Graeme
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