[U-Boot] ethernet duplex mpc8250

[C. Handel]

   hi list,

i have a mpc8260 based VME board, running 1.3.3 u-boot (yes i know
old, will try to upgrade as soon as possible). The board has trouble
negotiating its ethernet (FCC) duplex mode. Sometimes it negotiates
full, sometimes half duplex. If the board negotiates full duplex it
has trouble to receive TFTP images (problem then persists for the
booted system). I can't lock the port on the switch as the system
might be moved.

Is there a way to set duplex mode in u-boot?

Greetings
   Christoph