title: How to add more than 4 serial tty devices in Linux?
body: <p>When I run command "dmesg | grep tty", then it displays just 4 ttyS devices from 0 to 3. I used #MAKADEV and makenode commands and they created ttyS... files in /dev folder. So now, I cannot use them because their properties such as MMIO addresses are not set. I have heard of the "setserial" command, but I can not see that it sets serial device MMIO address. So is there a way I can do that?</p>
  
  <p>It is critical because my computer has 8 serial ports and I want to use them all. In my Linux, I can only use 4 of them..</p>