8250: Unknown symbol uart_get_baud_rate
8250: Unknown symbol uart_resume_port
8250: Unknown symbol uart_register_driver
8250: Unknown symbol uart_suspend_port
8250: Unknown symbol uart_remove_one_port
8250: Unknown symbol uart_update_timeout
8250: Unknown symbol uart_unregister_driver
8250: Unknown symbol uart_get_divisor
8250: Unknown symbol uart_match_port
8250: Unknown symbol uart_add_one_port
8250: Unknown symbol uart_write_wakeup