SD card on mmc2

Dear all,

I would like to make a board to connect to the BBB in such a way to have an SD card connected to the BBB by the mmc2 bus.
In this way could have 2 SD card accessible by the ARM.
I am not pretty sure if it is possible (in principle it could be).

I need your help in setting the software part.
In particular, this is how I would set the .dts file