[PATCH 1/2] powerpc: add kexec support on FSL-Book-E
Sebastian Andrzej Siewior
bigeasy at linutronix.de
Sat Aug 29 05:35:23 EST 2009
> Hi Sebastian,
> Recently I've implemented non-SMP kexec on MPC8572 and P2020ds(2G ram).
> I modified your
> misc_32.S that , I setuped two '1G' entries after the "rfi"
> instruction, so that I did
> not need to setup mapping for instruction address.
If you send some patches I could add them to my tree so we have
> As for SMP supporting,I tried to close one of the CPUs in
> and found that , when cpu1 closed ,and if the second kernel is NON-
> SMP,everything went well.so I added some code in
> kexec-tools, to make sure the 'kexec' process was running on CPU 0.
I remember that ppc64 had some code to suspend and start the second CPU in
the purgatory code. Not sure if there is a generic way for this on ppc32
or it is a book-e thing. Haven't look at it (yet).
> So, there left one problem, I can not start the second SMP-kernel,
> even if I closed
> CPU1. Any suggestions?
The interesting thing is where do you hang/crash. It could be possible
that the kernel is waiting for the non-boot cpus to show up and it
doesn't. Have you look how u-boot prepares the cpus and how kernel
disables them on shutdown?
> no-smp ---> no-smp.........OK
> no-smp --->smp...............OK
Does this mean your smp kernel has more that one CPU or just one?
> smp(with cpu1 closed)---->no-smp..............OK
> smpw(with cpu1 closed)---->smp ................FAILED
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