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Contrary to other hardware designs, octsimtest has a level-shifter in the I/O line to support testing with 1.8, 3 and 5V. This level shifter is bi-directional, but the direction needs to be explicitly specified via the SIM_IO_DIR signal attached to PA26. Change-Id: I44171363b5bd69d6049b12c86f8143be83557cb2