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This change prevents the floating RX console pin from entering unwanted commands. BRANCH=oak BUG=b:67033247 TEST=manual load on hana and probe USART RX pin Change-Id: I6dc05e03f82dcc71ea6f957f93c5fe7c6b65d2bf Signed-off-by: Rong Chang <rongchang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/722381 Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>