On Fri, Oct 21, 2011 at 10:15:24AM +0100, Will Deacon wrote: > On Fri, Oct 21, 2011 at 09:59:58AM +0100, Simon Horman wrote: > > On Fri, Oct 21, 2011 at 09:46:41AM +0100, Will Deacon wrote: > > > 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? > > What the callback does it up to you. You just need to make sure that you can > cope with the kernel disappearing later on, so you'll probably need some > hardware mechanism for offlining a CPU (for example, placing it in SRAM > or cutting the power). Thanks, it seems that I now have a bit of work to do implementing a callback.
