mem_mode is supposed to be atomic_noncaching when running AtomicSimpleCPU with Ruby cache. Change-Id: Icb419f9370038f5c1f80dd879b187338279a5b93 Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68877 Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>