grub with serial line configuration using PCI serial adapter

[rishat]

Hello
I have next configuration:

lspci -s 01:06.0 -vvv
01:06.0 Serial controller: MosChip Semiconductor Technology Ltd. PCI 
9835 Multi-I/O Controller (rev 01) (prog-if 02 [16550])
        Subsystem: LSI Logic / Symbios Logic 2S (16C550 UART)
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx+
        Interrupt: pin A routed to IRQ 21
        Region 0: I/O ports at ac00 [size=8]
        Region 1: I/O ports at a880 [size=8]
        Region 2: I/O ports at a800 [size=8]
        Region 3: I/O ports at a480 [size=8]
        Region 4: I/O ports at a400 [size=8]
        Region 5: I/O ports at a080 [size=16]
        Kernel driver in use: serial

grub-install -V
grub-install (GRUB) 2.02~beta3

setserial -g /dev/ttyS[0-4]
/dev/ttyS0, UART: 16550A, Port: 0xa880, IRQ: 21
/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3

taho htdocs # dmidecode --type 0
# dmidecode 2.12
SMBIOS 2.6 present.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: American Megatrends Inc.
        Version: 1304
        Release Date: 12/09/2010
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 2048 kB
        Characteristics:
                ISA is supported
                PCI is supported
                PNP is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                ESCD support is available
                Boot from CD is supported
                Selectable boot is supported
                BIOS ROM is socketed
                EDD is supported
                5.25"/1.2 MB floppy services are supported (int 13h)
                3.5"/720 kB floppy services are supported (int 13h)
                3.5"/2.88 MB floppy services are supported (int 13h)
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Serial services are supported (int 14h)
                Printer services are supported (int 17h)
                CGA/mono video services are supported (int 10h)
                ACPI is supported
                USB legacy is supported
                LS-120 boot is supported
                ATAPI Zip drive boot is supported
                BIOS boot specification is supported
                Targeted content distribution is supported
        BIOS Revision: 8.15

Unfortunately my motherboard don't have integrated com ports and I need 
to control all via serial connection.

When I tried to manually type a "serial --speed=115200 --unit=0 --word=8 
--parity=no --stop=1" in the grub command line it complains that COM1 
port don't exist. I have played with unit and port attributes but 
without any luck.

Could someone help me what I'm doing wrong? Is it problem with 
configuration or I have unsupported equipment?

Thank you very much in advance.

--
With best regards
Rishat