Hi
I am trying to use UART ports inside a container, on a Colibri iMX8X running TorizonCore 5.3.0+build.7. When I try to use them inside a container, I get the error “Operation not permitted”
Useful information:
This is uname -a
output:
imx8x:~$ uname -a
Linux imx8x 5.4.115-5.3.0+git.dbdbcabf0f98 #1-TorizonCore SMP PREEMPT Tue Jul 6 08:47:10 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
Writing to ports inside a container:
imx8x:~$ docker exec -it --user=root mapeador_arm64v8-qt5-vivante-no-ssh_bullseye_debug_f15fce5c-ed89-4b4c-a7f7-16bcaff06cc9_latest_instance /bin/bash
root@imx8x:/mapeador# ls
mapeador
root@imx8x:/mapeador# echo "test" > /dev/ttyLP0
bash: /dev/ttyLP0: Operation not permitted
root@imx8x:/mapeador# echo "test" > /dev/ttyLP2
bash: /dev/ttyLP2: Operation not permitted
root@imx8x:/mapeador# echo "test" > /dev/ttyLP3
bash: /dev/ttyLP3: Operation not permitted
Writing to ports in host, outside of any container:
imx8x:~$ echo "test" > /dev/ttyLP0
imx8x:~$ echo "test" > /dev/ttyLP2
imx8x:~$ echo "test" > /dev/ttyLP3
-sh: /dev/ttyLP3: Permission denied
Only the access to /dev/ttyLP3 is denied, which I think is because its used for serial console.
Output of ls -l /dev/tty*
inside of container:
root@imx8x:/mapeador# ls -l /dev/tty*
crw-rw-rw- 1 root tty 5, 0 Nov 17 14:37 /dev/tty
crw--w---- 1 root tty 4, 0 Nov 17 14:37 /dev/tty0
crw--w---- 1 root tty 4, 1 Nov 17 14:38 /dev/tty1
crw--w---- 1 root tty 4, 10 Nov 17 14:37 /dev/tty10
crw--w---- 1 root tty 4, 11 Nov 17 14:37 /dev/tty11
crw--w---- 1 root tty 4, 12 Nov 17 14:37 /dev/tty12
crw--w---- 1 root tty 4, 13 Nov 17 14:37 /dev/tty13
crw--w---- 1 root tty 4, 14 Nov 17 14:37 /dev/tty14
crw--w---- 1 root tty 4, 15 Nov 17 14:37 /dev/tty15
crw--w---- 1 root tty 4, 16 Nov 17 14:37 /dev/tty16
crw--w---- 1 root tty 4, 17 Nov 17 14:37 /dev/tty17
crw--w---- 1 root tty 4, 18 Nov 17 14:37 /dev/tty18
crw--w---- 1 root tty 4, 19 Nov 17 14:37 /dev/tty19
crw--w---- 1 root tty 4, 2 Nov 17 14:37 /dev/tty2
crw--w---- 1 root tty 4, 20 Nov 17 14:37 /dev/tty20
crw--w---- 1 root tty 4, 21 Nov 17 14:37 /dev/tty21
crw--w---- 1 root tty 4, 22 Nov 17 14:37 /dev/tty22
crw--w---- 1 root tty 4, 23 Nov 17 14:37 /dev/tty23
crw--w---- 1 root tty 4, 24 Nov 17 14:37 /dev/tty24
crw--w---- 1 root tty 4, 25 Nov 17 14:37 /dev/tty25
crw--w---- 1 root tty 4, 26 Nov 17 14:37 /dev/tty26
crw--w---- 1 root tty 4, 27 Nov 17 14:37 /dev/tty27
crw--w---- 1 root tty 4, 28 Nov 17 14:37 /dev/tty28
crw--w---- 1 root tty 4, 29 Nov 17 14:37 /dev/tty29
crw--w---- 1 root tty 4, 3 Nov 17 14:37 /dev/tty3
crw--w---- 1 root tty 4, 30 Nov 17 14:37 /dev/tty30
crw--w---- 1 root tty 4, 31 Nov 17 14:37 /dev/tty31
crw--w---- 1 root tty 4, 32 Nov 17 14:37 /dev/tty32
crw--w---- 1 root tty 4, 33 Nov 17 14:37 /dev/tty33
crw--w---- 1 root tty 4, 34 Nov 17 14:37 /dev/tty34
crw--w---- 1 root tty 4, 35 Nov 17 14:37 /dev/tty35
crw--w---- 1 root tty 4, 36 Nov 17 14:37 /dev/tty36
crw--w---- 1 root tty 4, 37 Nov 17 14:37 /dev/tty37
crw--w---- 1 root tty 4, 38 Nov 17 14:37 /dev/tty38
crw--w---- 1 root tty 4, 39 Nov 17 14:37 /dev/tty39
crw--w---- 1 root tty 4, 4 Nov 17 14:37 /dev/tty4
crw--w---- 1 root tty 4, 40 Nov 17 14:37 /dev/tty40
crw--w---- 1 root tty 4, 41 Nov 17 14:37 /dev/tty41
crw--w---- 1 root tty 4, 42 Nov 17 14:37 /dev/tty42
crw--w---- 1 root tty 4, 43 Nov 17 14:37 /dev/tty43
crw--w---- 1 root tty 4, 44 Nov 17 14:37 /dev/tty44
crw--w---- 1 root tty 4, 45 Nov 17 14:37 /dev/tty45
crw--w---- 1 root tty 4, 46 Nov 17 14:37 /dev/tty46
crw--w---- 1 root tty 4, 47 Nov 17 14:37 /dev/tty47
crw--w---- 1 root tty 4, 48 Nov 17 14:37 /dev/tty48
crw--w---- 1 root tty 4, 49 Nov 17 14:37 /dev/tty49
crw--w---- 1 root tty 4, 5 Nov 17 14:37 /dev/tty5
crw--w---- 1 root tty 4, 50 Nov 17 14:37 /dev/tty50
crw--w---- 1 root tty 4, 51 Nov 17 14:37 /dev/tty51
crw--w---- 1 root tty 4, 52 Nov 17 14:37 /dev/tty52
crw--w---- 1 root tty 4, 53 Nov 17 14:37 /dev/tty53
crw--w---- 1 root tty 4, 54 Nov 17 14:37 /dev/tty54
crw--w---- 1 root tty 4, 55 Nov 17 14:37 /dev/tty55
crw--w---- 1 root tty 4, 56 Nov 17 14:37 /dev/tty56
crw--w---- 1 root tty 4, 57 Nov 17 14:37 /dev/tty57
crw--w---- 1 root tty 4, 58 Nov 17 14:37 /dev/tty58
crw--w---- 1 root tty 4, 59 Nov 17 14:37 /dev/tty59
crw--w---- 1 root tty 4, 6 Nov 17 14:37 /dev/tty6
crw--w---- 1 root tty 4, 60 Nov 17 14:37 /dev/tty60
crw--w---- 1 root tty 4, 61 Nov 17 14:37 /dev/tty61
crw--w---- 1 root tty 4, 62 Nov 17 14:37 /dev/tty62
crw--w---- 1 root tty 4, 63 Nov 17 14:37 /dev/tty63
crw--w---- 1 root root 4, 7 Nov 17 14:42 /dev/tty7
crw--w---- 1 root tty 4, 8 Nov 17 14:37 /dev/tty8
crw--w---- 1 root tty 4, 9 Nov 17 14:37 /dev/tty9
crw-rw---- 1 root dialout 245, 0 Nov 17 14:50 /dev/ttyLP0
crw-rw---- 1 root dialout 245, 2 Nov 17 14:50 /dev/ttyLP2
crw--w---- 1 root tty 245, 3 Nov 17 14:38 /dev/ttyLP3
crw-rw---- 1 root dialout 4, 64 Nov 17 14:37 /dev/ttyS0
crw-rw---- 1 root dialout 4, 65 Nov 17 14:37 /dev/ttyS1
crw-rw---- 1 root dialout 4, 66 Nov 17 14:37 /dev/ttyS2
crw-rw---- 1 root dialout 4, 67 Nov 17 14:37 /dev/ttyS3
crw------- 1 root root 3, 0 Nov 17 14:37 /dev/ttyp0
crw------- 1 root root 3, 1 Nov 17 14:37 /dev/ttyp1
crw------- 1 root root 3, 2 Nov 17 14:37 /dev/ttyp2
crw------- 1 root root 3, 3 Nov 17 14:37 /dev/ttyp3
crw------- 1 root root 3, 4 Nov 17 14:37 /dev/ttyp4
crw------- 1 root root 3, 5 Nov 17 14:37 /dev/ttyp5
crw------- 1 root root 3, 6 Nov 17 14:37 /dev/ttyp6
crw------- 1 root root 3, 7 Nov 17 14:37 /dev/ttyp7
crw------- 1 root root 3, 8 Nov 17 14:37 /dev/ttyp8
crw------- 1 root root 3, 9 Nov 17 14:37 /dev/ttyp9
crw------- 1 root root 3, 10 Nov 17 14:37 /dev/ttypa
crw------- 1 root root 3, 11 Nov 17 14:37 /dev/ttypb
crw------- 1 root root 3, 12 Nov 17 14:37 /dev/ttypc
crw------- 1 root root 3, 13 Nov 17 14:37 /dev/ttypd
crw------- 1 root root 3, 14 Nov 17 14:37 /dev/ttype
crw------- 1 root root 3, 15 Nov 17 14:37 /dev/ttypf
Output of groups torizon
:
root@imx8x:/mapeador# groups torizon
torizon : torizon dialout audio video gpio i2cdev spidev pwm input kvm render
Trying the same as root inside the container results in the same error. I already read the UART article posted in developer.toradex.com. What could I be missing?
Thank you