• ClassicBoard:
  Run DOS configuration util (cfg) or use isapnp in linux.
• PC/4, PC/8:
  Configurable via DIP switches on the board itself.
• PC/16: I/O Addresses are fixed via PAL chips on the board. See table of I/O addresses in the manual.

mknod [port] [type] [major] [minor]

[port] = the device file to be created
[type] = c
[major] = the major # of your other ttyS devices
[minor] = the next minor #, following the sequence of your existing devices

The first Digi port should be ttyS4 or higher on most systems.

# ls -l /dev/ttyS*
crw-------   1 root     tty        4,  64 Mar  7 14:52 /dev/ttyS0
crw-------   1 root     tty        4,  65 Mar  7 14:52 /dev/ttyS1
crw-------   1 root     tty        4,  66 Mar  7 14:52 /dev/ttyS2
crw-------   1 root     tty        4,  67 Mar  7 14:52 /dev/ttyS3
# mknod /dev/ttyS4 c 4 68
# mknod /dev/ttyS5 c 4 69
# mknod /dev/ttyS6 c 4 70
# mknod /dev/ttyS7 c 4 71
# chgrp tty /dev/ttyS*
# ls -l /dev/ttyS*
crw-------   1 root     tty        4,  64 Mar  7 14:52 /dev/ttyS0
crw-------   1 root     tty        4,  65 Mar  7 14:52 /dev/ttyS1
crw-------   1 root     tty        4,  66 Mar  7 14:52 /dev/ttyS2
crw-------   1 root     tty        4,  67 Mar  7 14:52 /dev/ttyS3
crw-------   1 root     tty        4,  68 Mar  7 14:52 /dev/ttyS4
crw-------   1 root     tty        4,  69 Mar  7 14:52 /dev/ttyS5
crw-------   1 root     tty        4,  70 Mar  7 14:52 /dev/ttyS6
crw-------   1 root     tty        4,  71 Mar  7 14:52 /dev/ttyS7

setserial /dev/ttyS[#] ^fourport port [IO] irq [IRQ] uart [UART]

I/O should usually be entered in as a hex address (0x100, etc) and each port must have a unique I/O address. Digi's documentation gives addresses in hex values.

The setserial commands need to be run again each time the machine is rebooted. If you want them to remain configured, we recommend adding them to the appropriate startup script in your distribution of linux. (i.e. rc.serial)

For Example:

• 8 port board, using I/O Addresses in the range of the first physical serial port, and the irq the 1st and 3rd serial ports normally use:

  
  setserial /dev/ttyS4 ^fourport port 0x110 irq 4 uart 16650
  setserial /dev/ttyS5 ^fourport port 0x118 irq 4 uart 16650
  setserial /dev/ttyS6 ^fourport port 0x120 irq 4 uart 16650
  setserial /dev/ttyS7 ^fourport port 0x128 irq 4 uart 16650
  setserial /dev/ttyS8 ^fourport port 0x130 irq 4 uart 16650
  setserial /dev/ttyS9 ^fourport port 0x138 irq 4 uart 16650
  setserial /dev/ttyS10 ^fourport port 0x140 irq 4 uart 16650
  setserial /dev/ttyS11 ^fourport port 0x148 irq 4 uart 16650
  

  Notes:
  In order to use the resources of the 2nd serial port, substitute 3 for irq, and the following for I/O addresses:
  0x210, 0x218, 0x220, 0x228, 0x230, 0x238, 0x240, 0x248
  For a board with 4 ports, one would only use the first four lines of the example.
  The previous example is valid for the ClassicBoard. For the PC/X, substitute proper information where appropriate (i.e. uart).

Some older versions of setserial require the following command, as well:

setserial /dev/ttyS[first#] set_multiport port1 [IO] mask1 0xf match1 0xf
	Use Oxf for 4 ports
	Use 0xff for 8 ports, 
        or  0xffff for 16 ports.
	Use port2, mask2, match2 for a second board.