spapr: Allow changing offset for -kernel image
This allows moving the kernel in the guest memory. The option is useful for step debugging (as Linux is linked at 0x0); it also allows loading grub which is normally linked to run at 0x20000. This uses the existing kernel address by default. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Message-Id: <20200203032943.121178-6-aik@ozlabs.ru> Reviewed-by: NFabiano Rosas <farosas@linux.ibm.com> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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