Re: kexec: Clearing registers just before jumping into purgatory

Matthew Garrett
2013-10-11T16:40:22Z

On Fri, Oct 11, 2013 at 06:33:23PM +0200, Richard Weinberger wrote:
> On Fri, Oct 11, 2013 at 5:48 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> > On Fri, Oct 11, 2013 at 11:44:50AM -0400, Vivek Goyal wrote:
> >
> >> Just Curious. How is it useful. IOW, what's your use case of booting a new
> >> kernel and then jumping back.
> >
> > I'm kexecing into a kernel with a modified /dev/mem, modifying the
> > original kernel and then jumping back into it.
>
> How do you update the original kernel?

It's still in RAM, so the same way you'd modify any other arbitrary
physical address?

--
Matthew Garrett | mjg59@srcf.ucam.org