You need to find the IRQ and first I/O address of the device from the /proc/pci file and then use setserial to configure the serial port. Have you done this yet?
Standard Linux Serial Ports:
PC Port Linux Port
Com1 ttyS0
Com2 ttyS1
Com3 ttyS2
Com4 ttyS3
Login as root to determine settings used by the modem by typing the command: cat /proc/pci. Look for your modem vendor in the line "Communication Controller:...." and hopefully it is there. There will be an IRQ number assigned to the device, write that down. There will be a line "Non-prefetchable 32 bit memory...."
Write down the first I/O address. (e.g. I/O at 0x4800)
Depending on the port that the modem in on, type the command:
setserial /dev/ttySx uart 16550A port y irq z, where x is the port the modem is using, y is the I/O address, and z is the IRQ.
e.g. setserial /dev/ttyS0 uart 16550A port 0x4800 irq 10
I have used kppp which I like a lot to finish the modem setup. Run kppp at the command line and hopefully everything is clear from there.
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