On Fri, Oct 21, 2011 at 09:46:41AM +0100, Will Deacon wrote: > On Fri, Oct 21, 2011 at 09:34:26AM +0100, Simon Horman wrote: > > I have tested the kexec/mmu-off branch of your tree on the UP board > > I mentioned above and kexec works :) > > Hurrah! Thanks for giving it a spin. > > > > You mention UP in particular, which I will test. > > > Do you have any thoughts on SMP? > > Yes. Currently [i.e. on my branch above] you can do SMP kexec using the CPU > hotplug platform_cpu_kill callback to take down the CPUs in some > platform-specific manner. Thanks, I will take a look into it. > The more difficult case is when you want to offline the secondary CPUs into > a pen and then boot them in the new kernel. I did get some of this working, > but there are outstanding issues with whether the pen should be at a fixed > location or not. If not, then we need a way to tell the new kernel where it > is, which may involve updating the DT blob... Is the implication that the (working) callback method does not give the second kernel any secondary CPUs?
