Prova följande två kommandon.

# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A port:000003F8 irq:4 tx:4389 rx:810035 brk:8 RTS|DTR
1: uart:unknown port:000002F8 irq:3
2: uart:unknown port:000003E8 irq:4
3: uart:unknown port:000002E8 irq:3

# dmesg|grep ttyS0
[ 1.086076] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 1.086739] 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A