Snapdragon, does mainapp.config runs controller?

I think this does not execute any mc_att_control or sensors app.
But, all manual shows ./px4 should be executed with mainapp.config.
Which way is correct?

For the snapdragon the sensors app is controlled by the Hexagon DSP. The configuration for that can be found in the “usr/share/data/adsp/px4.config” Is that what you’re looking for?

I know the existence of /usr/share/data/adsp/px4.config.
However, why most of instruction manual and even never explains
the one should execute with /usr/share/data/adsp/px4.config ?

When you execute ./px4 mainapp.cfg then hexagon px4.config is also run.