Hi zs_get_instance returns a value 0 or 1 . zs occurance greater then that never get structure initialized. What I did was set up->port.membase to null in sunzilog_alloc_tables then a for loop to pick next available in zs_get_instance. A simple init space global counter would work as well The next stumble originated in sunzilog_init, accounting for mouse and keyboard left the uart_count 2 short of the number of serial ports. my tree's a mess Thanx Ray - To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html