Console on other than UART0?

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1

BBB’s J1 connects to UART0, and this is used for the serial console.

Is it possible to run the console on a different UART, and/or run another instance of the console on a different UART while concurrently running a console on UART0 ?

If this is possible, the procedure to do it on Debian would be appreciated.

Thanks!

2

On the bottom of this page will give you a clue:

http://beagleboard.org/support/faq

Why are no boot messages visible on a custom kernel?

  • Passing the wrong bootargs to the kernel is a possible cause. Linux kernels >= 2.6.36 are using ttyOn instead ttySn for the serials on OMAP, so set console=ttyO2,115200n8 in U-boot.

Regards,
John

3

Yes, you can use different UART and Run
check console ls -l /dev/ttyO*
Result
crw–w---- 1 root tty 248, 0 Jan 1 2000 /dev/ttyO0
crw-rw---- 1 root dialout 248, 1 Nov 10 13:23 /dev/ttyO1
crw-rw---- 1 root dialout 248, 4 Nov 10 14:37 /dev/ttyO4
than which want to open UART port
root@beaglebone:~# minicom -D /dev/ttyO4 -b 9600 for example

31 Ekim 2015 Cumartesi 23:08:01 UTC+2 tarihinde dlchambers yazdı:

4

BBB's J1 connects to UART0, and this is used for the serial console.

Is it possible to run the console on a different UART

Yes.

run another instance of the console on a different UART while concurrently running a console on UART0 ?

No; however, it would not be difficult to add this support.
What is your use-case?

Regards,
Peter Hurley

5

when check UART on BBB you will see only UART0 If you want to use other. You must defined others. There is tutorial maybe you can check this
http://tenderlovemaking.com/2014/01/19/enabling-ttyo1-on-beaglebone.html