MBED non standard Boards

I was put off MBED by the fact you have to by board for the listed ones on the site.
Then I found this post https://developer.mbed.org/questions/7443/Using-mbed-with-generic-STM32F103C8T6-ch/ and this article https://developer.mbed.org/users/hudakz/code/STM32F103C8T6_Hello/

I have a number of STM32 board left over from sample dev-kits. So I picked out one that was not really good for much. Enter the M24SR-DISCOVERY http://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/st25-nfc-rfid-eval-boards/st25-nfc-rfid-eval-boards/m24sr-discovery.html
which was made to sell the M24SR64 device for RFID.  RFID was all the rage recently but turned out to not give all it promised. To cut a long store short I have a board with LCD and very little IO pulled out to pads.

Using said board and info in links I did my own project on MBED,
https://developer.mbed.org/users/lloydg/code/M24SR-DISCOVERY-testbed/

it currently shows some graphs and port reads. I have not looked at the M24SR64 device as I can't think of anything to use it for.

Check out other post on using non standard Boards on MBED.
https://developer.mbed.org/questions/53937/STM32F3-Discovery-or-STM32F4-Discovery-a/
I have a stm32f4-discovery not the one with MBED support built in so I selected  a Arch Max board with same processor but I need to add my own library to handle pin functions for the different peripherals.
See this post- https://developer.mbed.org/questions/68507/Following-STM32F4DISCOVERY-KIT-FOR-STM32/