実際、追加した枚数は2枚で4ポート。
# dmesg | grep ttyS [ 1.652110] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ 1.673972] 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ 1.695226] 0000:01:0d.0: ttyS4 at I/O 0x2440 (irq = 5) is a 16550A [ 1.715691] 0000:01:0d.0: ttyS5 at I/O 0x2438 (irq = 5) is a 16550A [ 1.736635] 0000:01:0e.0: ttyS6 at I/O 0x2468 (irq = 11) is a 16550A [ 1.757096] 0000:01:0e.0: ttyS7 at I/O 0x2460 (irq = 11) is a 16550A # lspci | grep Serial 01:0d.0 Serial controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01) 01:0e.0 Serial controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01) # setserial -g /dev/ttyS? /dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4 /dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3 /dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4 /dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3 /dev/ttyS4, UART: 16550A, Port: 0x2440, IRQ: 5 /dev/ttyS5, UART: 16550A, Port: 0x2438, IRQ: 5 /dev/ttyS6, UART: 16550A, Port: 0x2468, IRQ: 11 /dev/ttyS7, UART: 16550A, Port: 0x2460, IRQ: 11