depending on your FMGS software standard you will receive an ECAM caution "F/CTL FLAP/MCDU DISAGREE" after pressing TO CONFIG pb/applying TO power if MCDU and actual flap setting don't match. this update also incorporates a function which compares your typed in TO speeds to VMC/Vs1g from an internal database. in case your inputs were too low for your entered ZFW, blockfuel, TO config then FMGS will notify you via an amber scratchpad message "TO SPEED TOO LOW"
i must admit those functions came with a fairly recent update though.