kexec --real-mode

[Bernhard Walle]

Hi,

* Eric W. Biederman [2008-04-23 07:00]:
> Bernhard Walle <bwalle at suse.de> writes:
> > * Jamey Sharp [2008-04-22 16:44]:
> >>
> >> On Tue, Apr 22, 2008 at 6:16 AM, Bernhard Walle <bwalle at suse.de> wrote:
> >> > did anybody try the --real-mode option with current release? I tried
> >> > it on two machines, and on one machine it just reboots, on the other
> >> > machine it hangs.
> >> 
> >> I think you're experiencing a bug that I just proposed a patch for. :-)
> >> You can confirm that: try adding the "--debug" option to your kexec
> >> call. If that works correctly, then I think you'll find that the patch
> >> in "[PATCH 2/9] Fix copy-paste bug: entry16 does not start at
> >> entry16_debug" will solve your problem. That's archived here:
> >> 
> >> http://lists.infradead.org/pipermail/kexec/2008-April/001581.html
> >
> > No, I used --debug already.
> 
> If this used to work when booting older kernels on your hardware.
> Jamey's patch 3/9 might help.

Well, now it goes until DEBUG_CHAR('j'). But the kernel doesn't boot.

> Otherwise if this is the first time you are trying it you may
> simply have encountered the reason that --real-mode is not the default.
> BIOS can get really strange after the kernel has been running.

That might be the case. Thanks for the information.

> You might try booting kexec_test and see where that puts you.

But that's ELF and not bzImage.


	Bernhard