diff --git a/hw/bsp/lpc17/boards/lpcxpresso1769/lpc1769.ld b/hw/bsp/lpc17/boards/lpcxpresso1769/lpc1769.ld
index ba0543f09..a6c35c157 100644
--- a/hw/bsp/lpc17/boards/lpcxpresso1769/lpc1769.ld
+++ b/hw/bsp/lpc17/boards/lpcxpresso1769/lpc1769.ld
@@ -181,15 +181,15 @@ SECTIONS
     /* ## Create checksum value (used in startup) ## */
     /* This cause issue with clang linker, so it is disabled */
     /* MemManage_Handler, BusFault_Handler, UsageFault_Handler may not be defined */
-/*    PROVIDE(__valid_user_code_checksum = 0 -*/
-/*                                         (_vStackTop*/
-/*                                         + (ResetISR + 1)*/
-/*                                         + (NMI_Handler + 1)*/
-/*                                         + (HardFault_Handler + 1)*/
-/*                                         + (( DEFINED(MemManage_Handler) ? MemManage_Handler : 0 ) + 1)*/
-/*                                         + (( DEFINED(BusFault_Handler) ? BusFault_Handler : 0 ) + 1)*/
-/*                                         + (( DEFINED(UsageFault_Handler) ? UsageFault_Handler : 0 ) + 1)*/
-/*                                         ) );*/
+    PROVIDE(__valid_user_code_checksum = 0 -
+                                         (_vStackTop
+                                         + (ResetISR + 1)
+                                         + (NMI_Handler + 1)
+                                         + (HardFault_Handler + 1)
+                                         + (( DEFINED(MemManage_Handler) ? MemManage_Handler : 0 ) + 1)
+                                         + (( DEFINED(BusFault_Handler) ? BusFault_Handler : 0 ) + 1)
+                                         + (( DEFINED(UsageFault_Handler) ? UsageFault_Handler : 0 ) + 1)
+                                         ) );
 
     /* Provide basic symbols giving location and size of main text
      * block, including initial values of RW data sections. Note that
diff --git a/hw/bsp/lpc17/boards/mbed1768/lpc1768.ld b/hw/bsp/lpc17/boards/mbed1768/lpc1768.ld
index ba0543f09..a6c35c157 100644
--- a/hw/bsp/lpc17/boards/mbed1768/lpc1768.ld
+++ b/hw/bsp/lpc17/boards/mbed1768/lpc1768.ld
@@ -181,15 +181,15 @@ SECTIONS
     /* ## Create checksum value (used in startup) ## */
     /* This cause issue with clang linker, so it is disabled */
     /* MemManage_Handler, BusFault_Handler, UsageFault_Handler may not be defined */
-/*    PROVIDE(__valid_user_code_checksum = 0 -*/
-/*                                         (_vStackTop*/
-/*                                         + (ResetISR + 1)*/
-/*                                         + (NMI_Handler + 1)*/
-/*                                         + (HardFault_Handler + 1)*/
-/*                                         + (( DEFINED(MemManage_Handler) ? MemManage_Handler : 0 ) + 1)*/
-/*                                         + (( DEFINED(BusFault_Handler) ? BusFault_Handler : 0 ) + 1)*/
-/*                                         + (( DEFINED(UsageFault_Handler) ? UsageFault_Handler : 0 ) + 1)*/
-/*                                         ) );*/
+    PROVIDE(__valid_user_code_checksum = 0 -
+                                         (_vStackTop
+                                         + (ResetISR + 1)
+                                         + (NMI_Handler + 1)
+                                         + (HardFault_Handler + 1)
+                                         + (( DEFINED(MemManage_Handler) ? MemManage_Handler : 0 ) + 1)
+                                         + (( DEFINED(BusFault_Handler) ? BusFault_Handler : 0 ) + 1)
+                                         + (( DEFINED(UsageFault_Handler) ? UsageFault_Handler : 0 ) + 1)
+                                         ) );
 
     /* Provide basic symbols giving location and size of main text
      * block, including initial values of RW data sections. Note that
diff --git a/hw/bsp/lpc40/boards/ea4088_quickstart/lpc4088.ld b/hw/bsp/lpc40/boards/ea4088_quickstart/lpc4088.ld
index 5897707f6..55b60e1e7 100644
--- a/hw/bsp/lpc40/boards/ea4088_quickstart/lpc4088.ld
+++ b/hw/bsp/lpc40/boards/ea4088_quickstart/lpc4088.ld
@@ -140,7 +140,7 @@ SECTIONS
         *(COMMON)
         . = ALIGN(4) ;
         _ebss = .;
-        PROVIDE(end = .);
+/*        PROVIDE(end = .);*/
     } > RamLoc64
 
     /* NOINIT section for RamPeriph32 */
@@ -159,7 +159,23 @@ SECTIONS
          . = ALIGN(4) ;
         _end_noinit = .;
     } > RamLoc64
-    PROVIDE(_pvHeapStart = DEFINED(__user_heap_base) ? __user_heap_base : .);
+
+    /* hathach add heap section for clang */
+    .heap (NOLOAD): {
+        __heap_start = .;
+        __HeapBase = .;
+        __heap_base = .;
+        __end = .;
+        PROVIDE(end = .);
+        PROVIDE(_end = .);
+        PROVIDE(__end__ = .);
+        KEEP(*(.heap*))
+        __HeapLimit = .;
+        __heap_limit = .;
+        __heap_end = .;
+    } > RamLoc64
+
+/*    PROVIDE(_pvHeapStart = DEFINED(__user_heap_base) ? __user_heap_base : .);*/
     PROVIDE(_vStackTop = DEFINED(__user_stack_top) ? __user_stack_top : __top_RamLoc64 - 0);
 
     /* ## Create checksum value (used in startup) ## */
diff --git a/hw/bsp/lpc40/family.cmake b/hw/bsp/lpc40/family.cmake
index fce9772b6..4c14da8a7 100644
--- a/hw/bsp/lpc40/family.cmake
+++ b/hw/bsp/lpc40/family.cmake
@@ -1,6 +1,7 @@
 include_guard()
 
 set(SDK_DIR ${TOP}/hw/mcu/nxp/lpcopen/lpc40xx/lpc_chip_40xx)
+set(CMSIS_DIR ${TOP}/lib/CMSIS_5)
 
 # include board specific
 include(${CMAKE_CURRENT_LIST_DIR}/boards/${BOARD}/board.cmake)
@@ -9,7 +10,7 @@ include(${CMAKE_CURRENT_LIST_DIR}/boards/${BOARD}/board.cmake)
 set(CMAKE_SYSTEM_PROCESSOR cortex-m4 CACHE INTERNAL "System Processor")
 set(CMAKE_TOOLCHAIN_FILE ${TOP}/examples/build_system/cmake/toolchain/arm_${TOOLCHAIN}.cmake)
 
-set(FAMILY_MCUS LPC18XX CACHE INTERNAL "")
+set(FAMILY_MCUS LPC40XX CACHE INTERNAL "")
 
 
 #------------------------------------
@@ -32,9 +33,6 @@ function(add_board_target BOARD_TARGET)
     ${SDK_DIR}/src/sysinit_17xx_40xx.c
     ${SDK_DIR}/src/uart_17xx_40xx.c
     )
-  target_compile_options(${BOARD_TARGET} PUBLIC
-    -nostdlib
-    )
   target_compile_definitions(${BOARD_TARGET} PUBLIC
     __USE_LPCOPEN
     CORE_M4
@@ -42,16 +40,20 @@ function(add_board_target BOARD_TARGET)
     )
   target_include_directories(${BOARD_TARGET} PUBLIC
     ${SDK_DIR}/inc
+    ${CMSIS_DIR}/CMSIS/Core/Include
     )
 
   update_board(${BOARD_TARGET})
 
   if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    target_compile_options(${BOARD_TARGET} PUBLIC -nostdlib)
+    target_link_options(${BOARD_TARGET} PUBLIC
+      "LINKER:--script=${LD_FILE_GNU}"
+      --specs=nosys.specs --specs=nano.specs
+      )
+  elseif (CMAKE_C_COMPILER_ID STREQUAL "Clang")
     target_link_options(${BOARD_TARGET} PUBLIC
       "LINKER:--script=${LD_FILE_GNU}"
-      # nanolib
-      --specs=nosys.specs
-      --specs=nano.specs
       )
   elseif (CMAKE_C_COMPILER_ID STREQUAL "IAR")
     target_link_options(${BOARD_TARGET} PUBLIC