Problems with NETMOS multi-serial port card Installation

If you have problems installing NETMOS multi-serial port cards, please help solve the problem-Linux general technology-Linux technology and application information. The following is a detailed description. There are two pci netmos serial port cards in the machine, but the system can only find four serial ports and cannot add them by yourself. How can I add them correctly:

In DEV, only ttyS0 ttyS1 ttyS2 ttyS3 can be found. Therefore, add ttyS0 to DEV and run the following command:
# Mknod ttyS4 c 245 4
Run later
/Bin/setserial/dev/ttyS4 port 0x9000 irq 18 uart 16550A
Appears:
/Dev/ttyS4: No such device or address

More/proc/pci Information
PCI devices found:
Bus 0, device 0, function 0:
Class 0600: PCI device 8086: 2770 (rev 129 ).
Bus 0, device 1, function 0:
Class 0604: PCI device 8086: 2771 (rev 129 ).
IRQ 16.
Master Capable. No bursts. Min Gnt = 10.
Bus 0, device 27, function 0:
Class 0403: PCI device 8086: 27d8 (rev 1 ).
IRQ 17.
Non-prefetchable 64 bit memory at 0xcdcf8000 [0 xcdcfbfff].
Bus 0, device 28, function 0:
Class 0604: PCI device 8086: 27d0 (rev 1 ).
IRQ 16.
Master Capable. No bursts. Min Gnt = 6.
Bus 0, device 28, function 3:
Class 0604: PCI device 8086: 27d6 (rev 1 ).
IRQ 17.
Master Capable. No bursts. Min Gnt = 6.
Bus 0, device 29, function 0:
Class 0c03: PCI device 8086: 27c8 (rev 1 ).
IRQ 19.
I/O at 0x3000 [0x301f].
Bus 0, device 29, function 1:
Class 0c03: PCI device 8086: 27c9 (rev 1 ).
IRQ 22.
I/O at 0x3400 [0x341f].
Bus 0, device 29, function 2:
Class 0c03: PCI device 8086: 27ca (rev 1 ).
IRQ 23.
I/O at 0x3800 [0x381f].
Bus 0, device 29, function 3:
Class 0c03: PCI device 8086: 27cb (rev 1 ).
IRQ 17.
I/O at 0x4000 [0x401f].
Bus 0, device 30, function 0:
Class 0604: PCI device 8086: 244e (rev 225 ).
Master Capable. No bursts. Min Gnt = 6.
Bus 0, device 31, function 0:
Class 0601: PCI device 8086: 27b8 (rev 1 ).
Bus 0, device 31, function 1:
Class 0101: PCI device 8086: 27df (rev 1 ).
IRQ 18.
I/O at 0xffa0 [0 xffaf].
Bus 0, device 31, function 2:
Class 0101: PCI device 8086: 27c0 (rev 1 ).
IRQ 20.
I/O at 0x5800 [0x5807].
I/O at 0x5400 [0x5403].
I/O at 0x5000 [0x5007].
I/O at 0x4800 [0x4803].
I/O at 0x4400 [0x0000f].
Non-prefetchable 32 bit memory at 0xgjffc00 [0 xgjfffff].
Bus 0, device 31, function 3:
Class 0c05: PCI device 8086: 27da (rev 1 ).
IRQ 3.
I/O at 0x400 [0x41f].
Bus 4, device 0, function 0:
Class 0300: PCI device 10de: 0161 (rev 161 ).
IRQ 11.
Non-prefetchable 32 bit memory at 0xcf000000 [0 xcfffffff].
Prefetchable 64 bit memory at 0xd0000000 [0 xdfffffff].
Non-prefetchable 64 bit memory at 0xce000000 [0 xceffffff].
Bus 2, device 0, function 0:
Class 0200: PCI device 11ab: 4362 (rev 25 ).
IRQ 17.
Non-prefetchable 64 bit memory at 0xcdefc000 [0 xcdefffff].
I/O at 0xc800 [0xc8ff].
Bus 1, device 1, function 0:
Class 0780: PCI device 9710: 9835 (rev 1 ).
IRQ 21.
Master Capable. Latency = 64.
I/O at 0x8000 [0x8007].
I/O at 0x7800 [0x7807].
I/O at 0x7400 [0x7407].
I/O at 0x7000 [0x7007].
I/O at 0x6800 [0x6807].
I/O at 0x6400 [0x640f].
Bus 1, device 2, function 0:
Class 0700: PCI device 9710: 9845 (rev 1 ).
IRQ 18.
Master Capable. Latency = 64.
I/O at 0xa000 [0xa007].
I/O at 0x9800 [0x9807].
I/O at 0x9400 [0x9407].
I/O at 0x9000 [0x9007].
I/O at 0x8800 [0x8807].
I/O at 0x8400 [0x840f].
Bus 1, device 3, function 0:
Class 0180: PCI device 1283: 8211 (rev 17 ).
IRQ 19.
Master Capable. No bursts. Min Gnt = 8.Max Lat = 8.
I/O at 0xb800 [0xb807].
I/O at 0xb400 [0xb403].
I/O at 0xb000 [0xb007].
I/O at 0xa800 [0xa803].
I/O at 0xa400 [0xa40f].