can't find interrupt number under /proc/interrupts for the pci multi-port on db1550

[rolf liu <rolfliu@xxxxxxxxx>]

I am running 2.4.31 on db1550 with a pci multi-port board. the kernel
starts up ok. but after start-up, I can't find the corresponding
interrupt number for this board, which is irq 2. I can find the device
under /proc/devices and /proc/tty/driver, etc. So I am now sure if it
is working ok. Is there good (simple) method to test this serial port?

thanks