diff --git a/bare-metal-bsp b/bare-metal-bsp
index f419b1a..6cd7ea8 160000
--- a/bare-metal-bsp
+++ b/bare-metal-bsp
@@ -1 +1 @@
-Subproject commit f419b1a3e6e9e8075d7e937ac5b1e1fb4829a976
+Subproject commit 6cd7ea887ad0f2d5ae692405ba0bbd2b6ee75646
diff --git a/hello-world/CMakeLists.txt b/hello-world/CMakeLists.txt
index b1db947..51e1a58 100644
--- a/hello-world/CMakeLists.txt
+++ b/hello-world/CMakeLists.txt
@@ -1,75 +1,12 @@
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.21)
 project(hello-world C)
+set(TARGET hello)
+add_executable(${TARGET} hello.c)
 
-# Set default board to iss if not specified
-if(NOT DEFINED BOARD)
-    set(BOARD "iss" CACHE STRING "Target board")
-endif()
+set(BOARD "iss" CACHE STRING "Target board")
+add_subdirectory(../bare-metal-bsp bsp)
+target_link_libraries(${TARGET} PRIVATE bsp)
 
-
-# Source files
-set(SOURCES
-    hello.c
-)
-
-message(STATUS "Building for board: ${BOARD}")
-message(STATUS "liu:${PROJECT_NAME} ")
-message(STATUS "Using board-specific files from: ${BSP_BASE}/env/${BOARD}")
-
-# Create executable with all objects
-add_executable(${PROJECT_NAME} 
-    ${SOURCES}   
-    
-)
-
-set_target_properties(${PROJECT_NAME}  PROPERTIES SUFFIX ".elf")
-
-# Link with board library
-#target_link_libraries(${PROJECT_NAME}  PRIVATE 
-# libwrap
-# ${BOARD}
-# $<TARGET_OBJECTS:asm_obj>
-# #$<TARGET_OBJECTS:env_start>
-# )
-
-# Include directories
-target_include_directories(${PROJECT_NAME}  PRIVATE
-    ${BSP_BASE}/include
-    ${BSP_BASE}/drivers
-    ${BSP_BASE}/env
-    ${BSP_BASE}/env/${BOARD}
-    ${BSP_BASE}/libwrap
-)
-
-# Add compile definitions
-target_compile_definitions(${PROJECT_NAME}  PRIVATE
-    BOARD_${BOARD}
-)
-
-# link global_compile_options to this target ????
-#target_link_libraries(${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
-    --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
-install(TARGETS ${PROJECT_NAME} 
-    RUNTIME DESTINATION bin
-)
+add_custom_command(TARGET ${TARGET} POST_BUILD
+        COMMAND ${CMAKE_OBJDUMP} -S  ${TARGET}.elf > ${TARGET}.dis
+        COMMENT "Creating disassembly for ${TARGET}")