ID:20920 User has specified PRESERVE_UNUSED_XCVR_CHANNEL QSF assignment at pins "<text>", but the tile "<text>" is completely empty. You must instantiate one dummy channel in the Tile and connect to a stable reference clock in order to preserve unused transceiver channels. See E-Tile Transceiver PHY User Guide for more information.

CAUSE: Tile cannot be empty due to BTI mitigation enabled.

ACTION: Insert a dummy channel in the tile to make BTI mitigation working.