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. 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... Will
