Support for building and running external apps (#112)

Libraries/elf_loader/CMakeLists.txt

@@ -0,0 +1,26 @@
+
+if(CONFIG_ELF_LOADER)
+    set(srcs  "src/esp_elf_symbol.c"
+            "src/esp_elf.c"
+            "src/esp_elf_adapter.c")
+
+    if(CONFIG_IDF_TARGET_ARCH_XTENSA)
+        list(APPEND srcs "src/arch/esp_elf_xtensa.c")
+
+        # ESP32-S2 need to set MMU to run ELF
+        if(CONFIG_IDF_TARGET_ESP32S2 AND (CONFIG_ELF_LOADER_LOAD_PSRAM))
+            list(APPEND srcs "src/soc/esp_elf_esp32s2.c")
+        endif()
+    endif()
+
+    set(include_dirs  "include")
+endif()
+
+idf_component_register(SRCS ${srcs}
+                       INCLUDE_DIRS ${include_dirs}
+                       PRIV_REQUIRES spi_flash)
+
+include(package_manager)
+if(CONFIG_ELF_LOADER)
+    cu_pkg_define_version(${CMAKE_CURRENT_LIST_DIR})
+endif()