What OS is running on the stm32 eval board?

[shiacapt]

Hi,

I am using Cube IDE to study. And the boardNucleo-uaa5zj-q.

My first program "Hello World" is printed well on the console.

But I would like to know what OS is running on this board?

If it is Free RTOS, in Pinout & Config -> Middleware, why could I choose X-CUBE-FREERTOS?

Thanks

[TDK · Accepted solution]

The OS you use, if any, is your choice and will be in the program you compile. If you don't compile with FreeRTOS or another RTOS, it won't use an OS.

There's no underlying OS on the board itself, unlike with a Windows system where the OS and program are separate.