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char *configstartunsigned char def_mac[6] = {0, 0xaa, 0xbb, 0xcc, 0xdd, 0xee};   for (configstart = (char *)0xbffff000;         configstart > (char *)0xbff80000;         configstart -= 0x1000) {         if ( *(int *)configstart == 0x35333131)            /* megvan a config magic */            break;   }   if (*(int *)configstart != 0x35333131)       printk("no valid mac found, using defaults");       memcpy(dev->dev_addr, def_mac, 6);   else       memcpy(dev->dev_addr, ((u8 *)configstart)+102, 6);   fi