The purgatory code reads the device tree's version and stores if needed the currently running CPU number. These 2 values are stored in Big Endian format in the device tree and should be byte swapped when running in Little Endian mode. Without this fix, when running in SMP environment, kexec or kdump kernel may fail booting with the following message : Failed to identify boot CPU Signed-off-by: Laurent Dufour <ldufour at linux.vnet.ibm.com> --- purgatory/arch/ppc64/v2wrap.S | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/purgatory/arch/ppc64/v2wrap.S b/purgatory/arch/ppc64/v2wrap.S index 6fc62e3..dc5034f 100644 --- a/purgatory/arch/ppc64/v2wrap.S +++ b/purgatory/arch/ppc64/v2wrap.S @@ -90,10 +90,20 @@ master: LOADADDR(16, dt_offset) ld 3,0(16) # load device-tree address mr 16,3 # save dt address in reg16 +#ifdef __BIG_ENDIAN__ lwz 6,20(3) # fetch version number +#else + li 4,20 + lwbrx 6,3,4 # fetch BE version number +#endif cmpwi 0,6,2 # v2 ? blt 80f +#ifdef __BIG_ENDIAN__ stw 17,28(3) # save my cpu number as boot_cpu_phys +#else + li 4,28 + stwbrx 17,3,4 # Store my cpu as BE value +#endif 80: LOADADDR(6,opal_base) # For OPAL early debug ld 8,0(6) # load the OPAL base address in r8
