I'm trying to connect 4 more serial port through PC104 extension. My board already has 4 serial ports. I know I need to rebuild kernel and change the values of CONFIG_SERIAL_8250_NR_UARTS=8 and CONFIG_SERIAL_8250_RUNTIME_UARTS=8 . But how do I now check if there are 8 available ?
I tried this commands in terminal and get only 4 tty as result. Is there an option to use with bootcodes to activate more serial ports?
dmesg | grep tty
Thanks in advance!