NS16550_init
cp->cn_dev = (void *)NS16550_init(cp->address, cp->speed);
extern volatile struct NS16550 *NS16550_init(int, int);
cp->cn_dev = (void *)NS16550_init(cp->address, cp->speed);
extern volatile struct NS16550 *NS16550_init(int, int);
cp->cn_dev = (void *)NS16550_init(cp->address, cp->speed);
extern volatile struct NS16550 *NS16550_init(int, int);