Yes, MCUXpresso doesn't support codefire.
you use Coldfire M54451EVB , you need use CodWarrior. I just checked MQX doesn't support his board.
As I know we do not have any plan for MQX to support M54451EVB.(Only the M54455EVB are supported in MQX4.x.)
Have a great day,
Jennie Zhang
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