faft: Simplify the autoboot USB cases when booting into factory install shim
When the test calls sync_and_reboot_with_factory_install_shim(), it may be
under firmware rollback error. A reboot triggers recovery mode. This method
also switches to dev mode. Under the dev mode + recovery mode, there are many
complicated autoboot USB cases, check more details in the RecoveryButton test.
In order to simplify these complicated cases, it is better to unplug the USB
first and plug it in when needed.
BUG=chromium-os:36303
TEST=run UpdateFirmwareVersion and UpdateFirmwareDataKeyVersion passed.
Change-Id: If894501834d0aebc8458c761416d98873bee5dc5
Reviewed-on: https://gerrit.chromium.org/gerrit/37976
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
3 files changed