There are three such prom_getintdefault() calls in bigmac_ether_init(), Meelis can you try commenting them out one by one to see which one triggers the crash? Perhaps that bp->qec_sdev or bp->bigmac_sdev pointers are corrupt or point to structures which don't have their prom_node values setup properly. A comparison of the prom_node values with /usr/sbin/prtconf -pv output would determine this.
Will test now that my 2.4 compile has finished.
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