Motorola PowerQUICC FCC Ethernet MTU issue ...

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We are using Motorola MPC8248's two FCCs as Ethernet ports. Somehow we
need to transmit frames two octets longer than normal maximum. The
normal maximum frame length allowed to transmit seems to be 1522 (FCS
included) by our trial and error. But we would like it to be 1524. We
know there is a MFLR register to specify how long an incoming frame can
be. But what we concern is the transmit direction. Is there a way to
achieve that or simply impossible for MPC8248?
Any clues will be highly appreciated. Thanks in advance!


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