Hi Jagas, Leo,
I'm also struggling to set up Thingsquare mist stack for cc2538 in ccs6.
I'm not a fan on lunix and would like to get a contiki tool chain working in windows.
Eclipse CCS is a popular toolchain for embedded developers, I'm surprised Thingsquare dose not support this toolchain with there development kit.
Did you get this working?
Willing to share you Project config files?
Regards Darren