How to boot Linux on  ARM core with only ARM instructions set

Note: This was originally posted on 20th August 2012 at http://forums.arm.com

Hi all,
On the ARM core with several instructions sets,I just want use ARM instruction set to run Linux,Is that possible? if possible,where need to be modified in the Linux?or just to modify the .config file? Any reply will be appreciated.
             Thanks a lot,
              Heron
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