This patch fixes the issues listed in: https://gem5.atlassian.net/browse/GEM5-887 https://gem5.atlassian.net/browse/GEM5-889 The code change has been verified by booting FS linux. Software, timer and external interrupts work as expected. Change-Id: I6ce4fc843d2e0338355152c3fc33c966d6b4a481 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40076 Reviewed-by: Ayaz Akram <yazakram@ucdavis.edu> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>