tree aaf4085d6aaf24bc24481e6b0518f1db81414a33
parent 2619e0a63a94f65cc2ded27d68cabf5ff0c0632a
author Andrew Scull <ascull@google.com> 1580825469 +0000
committer Andrew Scull <ascull@google.com> 1580828814 +0000

Don't rely on UNKNOWN register reset values.

To check a register was updated, a change in value needs to be observed
so do this explicitly rather than relying on the initial value which may
not be well defined.

Change-Id: I1da79c066f5fc76a6d829d07e586d3ebd4de5c1b