diff --git a/CMakeLists.txt b/CMakeLists.txt
index ab87c75..f382307 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,7 +52,7 @@ if(NOT DEFINED BOARD)
 endif()
 
 if(NOT DEFINED ISA)
-    set(ISA imc CACHE STRING "Target ISA")
+    set(ISA rv32imc CACHE STRING "Target ISA")
 endif()
 
 if(NOT DEFINED RISCV_ABI)
@@ -69,7 +69,7 @@ if(NOT BOARD IN_LIST SUPPORTED_BOARDS)
 endif()
 
 if(NOT ISA IN_LIST SUPPORTED_ISAS)
-    message(FATAL_ERROR "Invalid ISA specified. Supported ISAs: ${SUPPORTED_ISAS}")
+    message(FATAL_ERROR "Invalid ISA specified(${ISA}). Supported ISAs: ${SUPPORTED_ISAS}")
 endif()
 
 if(NOT RISCV_ABI IN_LIST SUPPORTED_ABIS)
@@ -91,8 +91,10 @@ set(BSP_BASE "${CMAKE_CURRENT_SOURCE_DIR}/bare-metal-bsp")
 add_compile_definitions(BOARD_${BOARD})
 
 # RISC-V specific compiler flags
-#set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -march=${RISCV_ARCH}_zicsr_zifencei -mabi=${RISCV_ABI}")
-#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=${RISCV_ARCH}_zicsr_zifencei -mabi=${RISCV_ABI}")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -g -march=${RISCV_ARCH}_zicsr_zifencei -mabi=${RISCV_ABI} -mcmodel=medany")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -g -march=${RISCV_ARCH}_zicsr_zifencei -mabi=${RISCV_ABI} -mcmodel=medany")
+#set(CMAKE_ASM_COMPILER riscv64-unknown-elf-as)
+set(CMAKE_ASM_FLAGS "${CMAKE_ASM_FLAGS} -O2 -g -march=${RISCV_ARCH}_zicsr_zifencei -mabi=${RISCV_ABI} -mcmodel=medany")
 
 # Optional: Enable semihosting support
 option(SEMIHOSTING "Enable semihosting support" OFF)
@@ -101,18 +103,18 @@ if(SEMIHOSTING)
 endif()
 
 #create interface library for propagating compile options
-add_library(global_compile_options INTERFACE)
+#add_library(global_compile_options INTERFACE)
 
 # Compile options
-target_compile_options(global_compile_options INTERFACE
-    -march=${RISCV_ARCH}_zicsr_zifencei
-    -mabi=${RISCV_ABI}
-    -mcmodel=medany
-    -O2
-    -g
+#target_compile_options(global_compile_options INTERFACE
+#    -march=${RISCV_ARCH}_zicsr_zifencei
+ #   -mabi=${RISCV_ABI}
+ #   -mcmodel=medany
+ #   -O2
+ #   -g
   #  -ffunction-sections
   #  -fdata-sections
-)
+#)
 
 
 
diff --git a/bare-metal-bsp b/bare-metal-bsp
index 87dc0ec..f419b1a 160000
--- a/bare-metal-bsp
+++ b/bare-metal-bsp
@@ -1 +1 @@
-Subproject commit 87dc0ec2304adcb94a25b397a357aadae1304867
+Subproject commit f419b1a3e6e9e8075d7e937ac5b1e1fb4829a976
diff --git a/hello-world/CMakeLists.txt b/hello-world/CMakeLists.txt
index af71120..b1db947 100644
--- a/hello-world/CMakeLists.txt
+++ b/hello-world/CMakeLists.txt
@@ -6,9 +6,6 @@ if(NOT DEFINED BOARD)
     set(BOARD "iss" CACHE STRING "Target board")
 endif()
 
-#set(BSP_BASE "${CMAKE_CURRENT_SOURCE_DIR}/../bare-metal-bsp")
-
-
 
 # Source files
 set(SOURCES
@@ -21,19 +18,19 @@ message(STATUS "Using board-specific files from: ${BSP_BASE}/env/${BOARD}")
 
 # Create executable with all objects
 add_executable(${PROJECT_NAME} 
-    ${SOURCES}
-    ${BSP_OBJECTS}
-   
+    ${SOURCES}   
     
 )
 
+set_target_properties(${PROJECT_NAME}  PROPERTIES SUFFIX ".elf")
+
 # Link with board library
-target_link_libraries(${PROJECT_NAME}  PRIVATE 
- ${LIBWRAP_OBJECTS}
- ${ENV_OBJECTS}
- #$<TARGET_OBJECTS:env_entry>
- #$<TARGET_OBJECTS:env_start>
- )
+#target_link_libraries(${PROJECT_NAME}  PRIVATE 
+# libwrap
+# ${BOARD}
+# $<TARGET_OBJECTS:asm_obj>
+# #$<TARGET_OBJECTS:env_start>
+# )
 
 # Include directories
 target_include_directories(${PROJECT_NAME}  PRIVATE
@@ -49,14 +46,27 @@ target_compile_definitions(${PROJECT_NAME}  PRIVATE
     BOARD_${BOARD}
 )
 
-# link global_compile_options to this target
-target_link_libraries(${PROJECT_NAME} PRIVATE global_compile_options)
+# link global_compile_options to this target ????
+#target_link_libraries(${PROJECT_NAME} PRIVATE global_compile_options)
+
+get_target_property(WRAP_LIBRARY_PATH libwrap ARCHIVE_OUTPUT_DIRECTORY)
+get_target_property(BOARDLIBRARY_PATH ${BOARD} ARCHIVE_OUTPUT_DIRECTORY)
+## TODDO ???
+set(ASM_OBJ_LIB "${BOARDLIBRARY_PATH}/CMakeFiles/asm_obj.dir")
+
+message(STATUS "in hello_world WRAP_LIBRARY_PATH : ${WRAP_LIBRARY_PATH}, BOARDLIBRARY_PATH : ${BOARDLIBRARY_PATH} ASM_OBJ_LIB: ${ASM_OBJ_LIB} ")
 
 # Set linker options
 target_link_options(${PROJECT_NAME}  PRIVATE
-    -T${BSP_BASE}/env/${BOARD}/link.ld
-    -nostartfiles
-    -Wl,--gc-sections
+    --verbose 
+    -L${ASM_OBJ_LIB}
+    -L${WRAP_LIBRARY_PATH}
+    -L${BOARDLIBRARY_PATH}  
+    ${ASM_OBJ_LIB}/start.S.o 
+    ${ASM_OBJ_LIB}/entry.S.o 
+    -L/scratch/hongyu/workarea/Firmwares/build/bare-metal-bsp/env/CMakeFiles/asm_obj.dir 
+    -g -Wl,--wrap=printf -march=rv32imc -mabi=ilp32 -L../bare-metal-bsp/env/ -Wl,--wrap=malloc -Wl,--wrap=open -Wl,--wrap=lseek -Wl,--wrap=_lseek -Wl,--wrap=read -Wl,--wrap=_read -Wl,--wrap=write -Wl,--wrap=_write -Wl,--wrap=fstat -Wl,--wrap=_fstat -Wl,--wrap=stat -Wl,--wrap=close -Wl,--wrap=_close -Wl,--wrap=link -Wl,--wrap=unlink -Wl,--wrap=execve -Wl,--wrap=fork -Wl,--wrap=getpid -Wl,--wrap=kill -Wl,--wrap=wait -Wl,--wrap=isatty -Wl,--wrap=times -Wl,--wrap=sbrk -Wl,--wrap=_sbrk -Wl,--wrap=exit -Wl,--wrap=_exit -Wl,--wrap=puts -Wl,--wrap=_puts -Wl,--wrap=printf -Wl,--wrap=sprintf -L. -Wl,--start-group -llibwrap -liss -lc -Wl,--end-group  -T /scratch/hongyu/workarea/Firmwares/bare-metal-bsp/env/iss/link.lds -Wl,--no-warn-rwx-segments -Wl,-Map=hello.map  -nostartfiles  -o hello.elf
+
 )
 
 # Install target