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If the serial tx/rx are floating, it can happen that bogus characters are detected on the line at boot time. This leads to U-boot accidentally thinking someone pressed a key to stop autoboot, thus stopping booting process. This can happen if the serial cable is not connected. There are hardware pull-ups on the board connected to serial cable VBUS. To solve this when the cable is not plugged, enable internal pull-ups as well for the tx/rx lines. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>