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Author Topic: More then 4 serial port  (Read 1148 times)

Offline mzlj10

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More then 4 serial port
« on: September 29, 2016, 06:28:16 AM »
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: [Select]
dmesg | grep tty
Thanks in advance!

Online Rich

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Re: More then 4 serial port
« Reply #1 on: September 29, 2016, 07:13:41 AM »

Offline mzlj10

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Re: More then 4 serial port
« Reply #2 on: September 29, 2016, 10:53:30 PM »
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?

Offline curaga

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Re: More then 4 serial port
« Reply #3 on: September 30, 2016, 12:14:07 AM »
They are in general enough, but your specific board may require something more. I'm afraid a quick google didn't tell what.
The only barriers that can stop you are the ones you create yourself.