diff --git a/Software/firmware/CMakeLists.txt b/Software/firmware/CMakeLists.txt
index 57983af..d76af5b 100644
--- a/Software/firmware/CMakeLists.txt
+++ b/Software/firmware/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.16)
 
 SET(CMAKE_CXX_STANDARD 20)
-SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wpedantic -Werror=pedantic -Wextra -Os")
+SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wpedantic -Werror=pedantic -Wextra")
 
 SET(PROJECT_NAME "app")
 project(${PROJECT_NAME})
@@ -15,10 +15,19 @@ add_executable(${PROJECT_NAME}
 
 target_link_libraries (${PROJECT_NAME} target womolin)
 
-add_custom_command(OUTPUT ${PROJECT_NAME}.bin
-                   COMMAND "${CMAKE_OBJCOPY} ARGS -O ihex ${PROJECT_NAME} ${PROJECT_NAME}.hex"
+add_custom_target(${PROJECT_NAME}.hex ALL DEPENDS ${PROJECT_NAME})
+
+add_custom_command(TARGET ${PROJECT_NAME}.hex
+                   COMMAND ${CMAKE_C_OBJCOPY} ARGS -O ihex ${PROJECT_NAME} ${PROJECT_NAME}.hex
                    DEPENDS ${PROJECT_NAME} 
                    COMMENT "objcopying ${PROJECT_NAME} to ${PROJECT_NAME}.hex")
 
-add_custom_target(${PROJECT_NAME}.hex ALL DEPENDS ${PROJECT_NAME})
+
+add_custom_target(${PROJECT_NAME}.bin ALL DEPENDS ${PROJECT_NAME})
+
+add_custom_command(TARGET ${PROJECT_NAME}.bin
+                   COMMAND ${CMAKE_C_OBJCOPY} ARGS -S -O binary ${PROJECT_NAME} ${PROJECT_NAME}.bin
+                   DEPENDS ${PROJECT_NAME} 
+                   COMMENT "objcopying ${PROJECT_NAME} to ${PROJECT_NAME}.bin")
+
 
diff --git a/Software/firmware/helper/build.sh b/Software/firmware/helper/build.sh
index f94bcf5..8a8bd73 100755
--- a/Software/firmware/helper/build.sh
+++ b/Software/firmware/helper/build.sh
@@ -59,3 +59,20 @@ cmake -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} \
 make
 
 
+###########################
+# mainunit release version
+###########################
+WOMOLIN_TARGET="TARGET_MAINUNIT"
+TARGET_FOLDER="${BUILD_MAINUNIT_ROOT}/${RELEASE}"
+CMAKE_TOOLCHAIN_FILE="${CMAKE_TOOLCHAIN_FILE_MAINUNIT}"
+
+mkdir -p "${TARGET_FOLDER}"
+cd ${TARGET_FOLDER}
+
+cmake -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} \
+      -DCMAKE_BUILD_TYPE=${RELEASE} \
+      ${FIRMWARE_ROOT}
+
+make
+
+
diff --git a/Software/firmware/helper/target.mainunit b/Software/firmware/helper/target.mainunit
index e4f3745..f7ca2dd 100644
--- a/Software/firmware/helper/target.mainunit
+++ b/Software/firmware/helper/target.mainunit
@@ -1,17 +1,34 @@
 SET(WOMOLIN_TARGET "TARGET_MAINUNIT")
+SET(CMAKE_SYSTEM_NAME Generic)
+SET(CMAKE_SYSTEM_PROCESSOR arm)
+SET(CMAKE_CROSSCOMPILING 1)
 
 SET(CMAKE_C_COMPILER /opt/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc)
 SET(CMAKE_CXX_COMPILER "/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-g++")
-SET(CMAKE_OBJCOPY "/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-objcopy")
+SET(CMAKE_C_OBJCOPY "/opt/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-objcopy")
 SET(CMAKE_CXX_FLAGS -D${WOMOLIN_TARGET})
 SET(CMAKE_EXE_LINKER_FLAGS "-specs=nosys.specs")
 
-SET(CPU "cortex-m4")
+SET(COMMON_COMPILE_FLAGS "-mcpu=cortex-m4 \
+                          -mthumb-interwork \
+                          -mfloat-abi=hard \
+                          -mlong-calls \
+                          -ffunction-sections \
+                          -fno-exceptions \
+                          -fdata-sections \
+                          -DSTM32L476xx \
+                          -DUSE_HAL_DRIVER")
 
-SET(COMMON_COMPILE_FLAGS "-mcpu=${CPU} -mthumb -DSTM32L476xx -DUSE_HAL_DRIVER")
 
 SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${COMMON_COMPILE_FLAGS}")
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_COMPILE_FLAGS}")
 
-ADD_COMPILE_OPTIONS("-Tdrv/system/cmsis/STM32L476RGTx_FLASH.ld")
+set(CMAKE_C_FLAGS_RELEASE "-Os")
+set(CMAKE_CXX_FLAGS_RELEASE "-Os")
+
+set(CMAKE_C_FLAGS_DEBUG "-Og -g -gdwarf-3 -gstrict-dwarf")
+set(CMAKE_CXX_FLAGS_DEBUG "-Og -g -gdwarf-3 -gstrict-dwarf")
+
+ADD_COMPILE_OPTIONS("-Wl, -T\"${CMAKE_SOURCE_DIR}/target/mainunit/drv/system/STM32L476RGTx_FLASH.ld\"")
+#set(CMAKE_EXE_LINKER_FLAGS "-Wl, -T\"${CMAKE_SOURCE_DIR}/target/mainunit/drv/system/STM32L476RGTx_FLASH.ld\"")