Debian Hardware :: Serial Port I/O Error On Intel NUC With Wheezy

I have a problem getting Serial Port working on INTEL NUC DE3815TYBE. I have Debian Wheezy installed with kernel 3.16.0-0.bpo.4-amd64.

When I do :

Code: Select allsetserial -g /dev/ttyS*

I get:

Code: Select all/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: 16550A, Port: 0x0000, IRQ: 19
/dev/ttyS2, UART: 16550A, Port: 0x0000, IRQ: 19
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3

I can connect to ttyS0 - ttyS2 without any problem but ttyS3 is not working and I am getting this error:

I call command:

Code: Select allstty -F /dev/ttyS3 9600 cs8 cread clocal

I get:

Code: Select allstty: /dev/ttyS3: Input/output error

I am running the commands as ROOT. I also tried: setserial /dev/ttyS3 irq 3 uart 16550A skip_test but I am getting the same stty: /dev/ttyS3: Input/output error

Output of:

Code: Select alldmesg | grep tty

Code: Select all[    0.000000] console [tty0] enabled
[    0.952559] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[    0.953593] 0000:00:1e.3: ttyS1 at MMIO 0xd0810000 (irq = 19, base_baud = 2764800) is a 16550A
[    0.954072] 0000:00:1e.4: ttyS2 at MMIO 0xd080e000 (irq = 19, base_baud = 2764800) is a 16550A
[  27.740208] ttyS2 - failed to request DMA

[Code] .....

lsof /dev/ttyS3 doesn't return anything so it means there is nothing connected to ttyS3 I guess but I am not very skilled with linux so I might be mistaken

Why I can see 4 ttyS* in my Linux but physically I have only 2 physical Serial Ports on the board?