BBB (Debian) - UART loopback?

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1

I’m running the latest Debian image, so far I’ve…

  1. mkdir /mnt/boot
  2. mount /dev/mmcblk0p1 /mnt/boot
  3. nano /mnt/boot/uEnv.txt

and added the following lines…

UART 1

cape_enable=capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART4,BB-UART5

ls -l /dev/ttyO* crw-rw---- 1 root tty 248, 0 May 15 02:50 /dev/ttyO0 crw-rw—T 1 root dialout 248, 1 May 15 02:50 /dev/ttyO1 crw-rw—T 1 root dialout 248, 2 May 15 02:50 /dev/ttyO2 crw-rw—T 1 root dialout 248, 4 May 15 02:50 /dev/ttyO4 crw-rw—T 1 root dialout 248, 5 May 15 02:50 /dev/ttyO5
So as far as I can tell all the UART’s are now enabled using the default settings.

I have a wire connecting the P9 pin 11 and 13.

root@beagle:~# echo “1234567890” > /dev/ttyO4
root@beagle:~# cat /dev/ttyO4

Returns nothing.

What am I doing wrong here?

Thanks, -Cody

2

Same problem,
See my post,
https://groups.google.com/forum/embed/?place=forum/beagleboard&showsearch=true&showpopout=true&showtabs=true&hideforumtitle=true&parenturl=http://beagleboard.org/Community/Forums&afterlogin&pli=1#!category-topic/beagleboard/beaglebone-black/gt6o_DpXvdA