iMX8MM: device-tree missing in configfs (including overlays)

[tdoering]

Hi,

I'm trying to utilize device-tree Overlays using configfs. However, "device-tree" is missing in configfs.

/proc/device-tree (aka /sys/firmware/devicetree) is read-only.

Any ideas?

Thanks you.
Thomas

Yocto-Dunfell, Linux Kernel 5.4

Edit: The kernel is built using the required CONFIG-Switches (CONFIG_OF_OVERLAY a.s.o.)

[Zhiming_Liu]

Can you share the output log about the "read only" you mentioned?