Bureaucrats, dave_user, Administrators
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<pre class="workstation-terminal">
root@imx6qdlxelkdesk-mx6:~# ls -la /sys/class/leds/
total 0
drwxr-xr-x 2 root root 0 Apr 2 2020 .
lrwxrwxrwx 1 root root 0 Apr 2 2020 rs232_485_422 -> ../../devices/soc0/leds/leds/rs232_485_422
lrwxrwxrwx 1 root root 0 Apr 2 2020 rs232_on -> ../../devices/soc0/leds/leds/rs232_on
root@imx6qdlxelkdesk-mx6:~#
</pre>
<pre class="workstation-terminal">
root@imx6qdlxelkdesk-mx6:~# echo 90 > /sys/class/gpio/exportroot@imx6qdlxelkdesk-mx6:~# echo out > /sys/class/gpio/gpio90/directionroot@imx6qdlxelkdesk-mx6:~# echo 1 > /sys/class/gpio/gpio90/valueroot@imx6qdlxelkdesk-mx6:~#
</pre>
<pre class="workstation-terminal">
root@imx6qdlxelkdesk-mx6:~# echo 91 > /sys/class/gpio/exportroot@imx6qdlxelkdesk-mx6:~# echo in > /sys/class/gpio/gpio91/directionroot@imx6qdlxelkdesk-mx6:~# cat /sys/class/gpio/gpio91/value
1
root@imx6qdlxelkdesk-mx6:~#
</pre>