export RTEMS_MAKEFILE_PATH=$HOME/development/rtems/bsps/4.12/sparc-rtems4.12/sis/

export PATH=$HOME/development/rtems/4.12/bin:$PATH

To make one application start, just do: cd [PATH OF APP] make sparc-rtems4.12-gdb o-optimize/posix_hello.exe make tar sim load r