the problems of losing the encryption key when the power fails before the key can be written back, failing to select the correct NVM_FLASH_WRITEONCE sector when a sector is corrupt, and losing the testing state when the power fails before the partition state can be set. these issues are addressed in the next commit
powerfail and add an exception to wolfBoot_delta_update when a revert gets
interrupted since the version will change in the middle of the update process
0th sector has been changed with the update partition still being in
IMG_STATE_UPDATING state. the state still being IMG_STATE_UPDATING means that a
delta update started and that the version may have been switched over, in which
case wolfBoot_current_firmware_version() >= wolfBoot_update_firmware_version()
no longer tells us if we need to perform an inverse operation on it's own.
also removes part of the update powerfail test that does checks for the
previous version without triggering a rollback
John Bland
Daniele Lacamera