CentOS - Dec 2007 - Trouble getting all my com-ports (ttyS*)

I just installed CentOS 5.1 on a Dell Vostro 200 (Intel G33) which has a
Sunix PCI-Express (x1) 8-port RS-232 card installed. For me it looks
like only 4 ports are recognized, but I'm not sure if it's even working
with those 4.
>From 'dmesg' I see this:
...
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 19 (level, low) -> IRQ 177
0000:04:00.0: ttyS0 at I/O 0xbf00 (irq = 177) is a 16550A
0000:04:00.0: ttyS1 at I/O 0xbf08 (irq = 177) is a 16550A
0000:04:00.0: ttyS2 at I/O 0xbe00 (irq = 177) is a 16550A
0000:04:00.0: ttyS3 at I/O 0xbe08 (irq = 177) is a 16550A
Couldn't register serial port 0000:04:00.0: -28
...

[root at smse2e ~]# ls -la /dev/ttyS*
crw-rw---- 1 root uucp 4, 64 Dec  6  2007 /dev/ttyS0
crw-rw---- 1 root uucp 4, 65 Dec  6  2007 /dev/ttyS1
crw-rw---- 1 root uucp 4, 66 Dec  6  2007 /dev/ttyS2
crw-rw---- 1 root uucp 4, 67 Dec  6  2007 /dev/ttyS3

Link to the RS_232 card:
http://www.sunix.com.tw/it/en/Product_Detail.php?cate=2&class_a_id=35&si
d=459

How can I get the other 4 enabled?



/Christopher Thorjussen

Please don't print this e-mail unless you really need to

Christopher Thorjussen wrote:
> I just installed CentOS 5.1 on a Dell Vostro 200 (Intel G33) which has a
> Sunix PCI-Express (x1) 8-port RS-232 card installed. For me it looks
> like only 4 ports are recognized, but I'm not sure if it's even
working
> with those 4.
<snip>
> How can I get the other 4 enabled?
Pass "8250.nr_uarts=8" to the kernel to tell it to create more than
the
default 4 serial ports (add to /etc/grub/menu.lst and reboot). NOTE: the
maximum number of UARTs supported by the CentOS 5 kernel (as of
2.6.18-8.1.8.el5) seems to be 32.

Cheers,
Michael