I want to know about PX4's filesystem

Hello, I am a student studying the structure of PX4.

The software I have for PX4 is fmu_v5, and I want to know the filesystem of the firmware built with the default option.

After checking the configuration and build options, it says cromfs, is this correct?

Or if not, what document can I refer to?

Any help would be greatly appreciated.

thank you

I found CROMFS in Nuttx manual & hexedit…

and it uses virtual filesystem & CROMFS for other datas (backup data… etc. because of filesize)

is it correct?