Enable UART pins on BBB with Ubuntu 16.04 Kernel 4.4.68

[Zach]

Hello there, I am attempting to activate UART pins on the BeagleBone Black with Ubuntu 16.04 kernel 4.4.68

ubuntu@arm:~$ uname -a

Linux arm 4.4.68-ti-r111 #1 SMP Wed Jun 28 13:40:31 UTC 2017 armv7l armv7l armv7l GNU/Linux

I have tried editing the /boot/uEnv.txt file.

cape_enable=bone_capemgr.enable_partno=BB-UART1

I have tried 

echo BB-UART1 > /sys/devices/platform/bone_capemgr/slots

Which causes the BBB to stall, I even let it sit for almost 2 hours once to no results.

ubuntu@arm:~$ ls -l /dev/ttyO*

lrwxrwxrwx 1 root root 5 Jul 14 14:48 /dev/ttyO0 -> ttyS0

lrwxrwxrwx 1 root root 5 Jul 14 14:48 /dev/ttyO1 -> ttyS1

lrwxrwxrwx 1 root root 5 Jul 14 14:48 /dev/ttyO2 -> ttyS2

lrwxrwxrwx 1 root root 5 Jul 14 14:48 /dev/ttyO4 -> ttyS4

ubuntu@arm:~$ ls -l /dev/ttyS*

crw--w---- 1 root tty     4, 64 Jul 14 14:48 /dev/ttyS0

crw-rw---- 1 root dialout 4, 65 Jul 14 14:48 /dev/ttyS1

crw-rw---- 1 root dialout 4, 66 Jul 14 14:48 /dev/ttyS2

crw-rw---- 1 root dialout 4, 67 Jul 14 14:48 /dev/ttyS3

crw-rw---- 1 root dialout 4, 68 Jul 14 14:48 /dev/ttyS4

crw-rw---- 1 root dialout 4, 69 Jul 14 14:48 /dev/ttyS5

I have tried 

config-pin 911 uart
config pin 913 uart

ubuntu@arm:~$ config-pin -q 911

P9_11 Mode: uart

ubuntu@arm:~$ config-pin -q 913

P9_13 Mode: uart

But still no data being transferred.  My end goal is to use ROS with a PixHawk for drone flights.  Any help would be greatly appreciated.

  

[Robert Nelson]

P9_11/P9_13 = ttyS4

So it 'should' work after running those two config-pin commands..

Regards,


--
Robert Nelson
https://rcn-ee.com/

[salah...@gmail.com]

Hello,

I've also faced the same issue.

Even though I tried editing the /boot/uEnv.txt file, I cannot enable uart

cape_enable=bone_capemgr.enable_partno=BB-UART2

I had to use 

config-pin P9_21 uart
config-pin P9_22 uart

to enable my uart2 channel.

@Zach : Please try the same and let me know. I don't know if it will work in Ubuntu.

@Robert or anyone else, why enabling uart in uEnv.txt is not successful always?