OS is always running in the background which also takes up CPU cycles and it may be doing constant checks and alot more than we know. Second core is used for network communications features as well as running the main OS. Network communication runs along OS level to keep the system updated like street-pass, spot-pass etc...it is well known that the other CPU is dedicated to WIFI. not os.
this story is fake.
Fair enough.
Although I remember reading that OS is run on the main core, not this core. This core was supposed to be for WIFI and IR exclusively. (this is how the circle pad pro works by accessing the IR which is constantly running from the second core, as well as all streetpass and spotpass data)
The main core handles screens, LED lights, switches, both screens, mic, GPU, speakers and sensors.
Hmm, I know the 3DS has two cores. One core is fully dedicated to developers to optimise their games and the other core is run other features of the 3DS like commuication, OS and certain other stuff.

