[SOLVED]Sdef file, or sdef files. Where are they located?

Hello spator, thanks for your help.

In my WP85 I´ve got 6.10 Framework installed.
The legato directory looks like this:

there isn´t a default sdef file. I have created system.sdef file and I have copied it in legato, but results are not what I expected.

I have read these lines in documentation:

----mdef File Load

----You can also use Legato’s mdef to load the pre-built kernel module.

----Create Kernel Module Definition .mdef hello.mdef file in any location with this preBuilt section:

----preBuilt: /path/to/kernel/module/ktest_module.ko

----Modify $LEGATO_ROOT/system.sdef (in Legato root dir) to include the kernelModule path:

----kernelModules:
----{ “path_to_hello.mdef” }

When I try to do

echo $LEGATO_PATH

I don´t get a result