preprojectconfig added

cmake/PreProjectConfig.cmake

@@ -0,0 +1,44 @@
+set(RTEMS_CONFIG_DIR 
+    "${CMAKE_CURRENT_SOURCE_DIR}/cmake/rtems-cmake"
+    CACHE FILEPATH
+    "Directory containing the RTEMS *.cmake files"
+)
+
+include(${RTEMS_CONFIG_DIR}/RTEMSPreProjectConfig.cmake)
+
+if(NOT DEFINED RTEMS_PREFIX)
+    if(NOT DEFINED ENV{RTEMS_PREFIX})
+        message(FATAL_ERROR 
+            "RTEMS_PREFIX must be set either manually or as an environment "
+            "variable!"
+        )
+    else()
+        message(STATUS 
+            "Using environment variable RTEMS_PREFIX $ENV{RTEMS_PREFIX} "
+            "as RTEMS prefix"
+         )
+        set(RTEMS_PREFIX $ENV{RTEMS_PREFIX})
+    endif()
+endif()
+
+if(${TGT_BSP} MATCHES "arm/stm32h743zi-nucleo")
+    set(RTEMS_BSP "arm/nucleo-h743zi")
+else()
+    if(NOT DEFINED RTEMS_BSP)
+        if(NOT DEFINED ENV{RTEMS_BSP})
+            message(FATAL_ERROR 
+                "RTEMS_BSP must be set either manually or as an environment"
+                "variable!"
+            )
+        else()
+            set(RTEMS_BSP $ENV{RTEMS_BSP})
+        endif()
+    endif()
+endif()
+
+rtems_pre_project_config(${RTEMS_PREFIX} ${RTEMS_BSP})
+
+set(CMAKE_TOOLCHAIN_FILE
+    ${RTEMS_CONFIG_DIR}/RTEMSToolchain.cmake 
+    PARENT_SCOPE
+)