Hello, While trying to compile very simple project (hello_world) the following errors occur (please see the copy of Build log below) Can someone help me in resolving of the problem. Or at least understand what mean these messages - in the core of error message there is "selected processor" ... but in compiler settings I didn't specify any processor ? Thanks in advance. Pavel -------------- Build: Makefile in hello_world MinGW (compiler: GNU GCC Compiler for ARM)--------------- arm-none-eabi-gcc.exe -I..\..\platform\cc2538dk -I..\..\platform\cc2538dk\dev -I..\..\core -I..\..\core\sys -I..\..\cpu\cc2538 -I..\..\cpu\cc2538\dev -c ..\..\platform\cc2538dk\startup-gcc.c -o .objs\platform\cc2538dk\startup-gcc.o C:\Users\Pavel\AppData\Local\Temp\ccCi6gqg.s: Assembler messages: C:\Users\Pavel\AppData\Local\Temp\ccCi6gqg.s:261: Error: selected processor does not support Thumb mode `it lt' C:\Users\Pavel\AppData\Local\Temp\ccCi6gqg.s:262: Error: Thumb does not support conditional execution Process terminated with status 1 (0 minute(s), 0 second(s)) 2 error(s), 0 warning(s) (0 minute(s), 0 second(s))