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More then 4 serial port

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mzlj10:
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?

--- Code: --- dmesg | grep tty
--- End code ---

Thanks in advance!

Rich:
Hi mzlj10
Maybe this is of some use:
http://forum.tinycorelinux.net/index.php/topic,19746.msg122400.html#msg122400

mzlj10:
Thank you for your tip.
I already followed this steps but I get only 4 serial port. Is there some additional configs to set in the OS to see this 4 more port?

curaga:
They are in general enough, but your specific board may require something more. I'm afraid a quick google didn't tell what.

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