arch/ppc64/boot/README

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   2 To extract the kernel vmlinux, System.map, .config or initrd from the zImage binary:
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   4 objcopy -j .kernel:vmlinux -O binary zImage vmlinux.gz
   5 objcopy -j .kernel:System.map -O binary zImage System.map.gz
   6 objcopy -j .kernel:.config -O binary zImage config.gz
   7 objcopy -j .kernel:initrd -O binary zImage.initrd initrd.gz
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   9
  10         Peter
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