diff --git a/bsp/stm32/stm32l475-atk-pandora/rtconfig.py b/bsp/stm32/stm32l475-atk-pandora/rtconfig.py
index f09dfbc3b7..9314a28375 100644
--- a/bsp/stm32/stm32l475-atk-pandora/rtconfig.py
+++ b/bsp/stm32/stm32l475-atk-pandora/rtconfig.py
@@ -73,7 +73,8 @@ elif PLATFORM == 'armcc':
     DEVICE = ' --cpu Cortex-M4.fp '
     CFLAGS = '-c ' + DEVICE + ' --apcs=interwork --c99'
     AFLAGS = DEVICE + ' --apcs=interwork '
-    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rt-thread.map --strict --scatter "board\linker_scripts\link.sct"'
+    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rt-thread.map '
+    LFLAGS += r' --strict --scatter "board\linker_scripts\link.sct" '
     CFLAGS += ' -I' + EXEC_PATH + '/ARM/ARMCC/include'
     LFLAGS += ' --libpath=' + EXEC_PATH + '/ARM/ARMCC/lib'
 
@@ -94,6 +95,39 @@ elif PLATFORM == 'armcc':
 
     POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'
 
+elif PLATFORM == 'armclang':
+    # toolchains
+    CC = 'armclang'
+    CXX = 'armclang'
+    AS = 'armasm'
+    AR = 'armar'
+    LINK = 'armlink'
+    TARGET_EXT = 'axf'
+
+    DEVICE = ' --cpu Cortex-M4.fp '
+    CFLAGS = ' -xc -std=c99 --target=arm-arm-none-eabi -mcpu=cortex-m4 '
+    CFLAGS += ' -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 '
+    CFLAGS += ' -mfloat-abi=hard -c -fno-rtti -funsigned-char -fshort-enums -fshort-wchar '
+    CFLAGS += ' -gdwarf-3 -ffunction-sections '
+    AFLAGS = DEVICE + ' --apcs=interwork '
+    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers '
+    LFLAGS += ' --list rt-thread.map '
+    LFLAGS += r' --strict --scatter "board\linker_scripts\link.sct" '
+    CFLAGS += ' -I' + EXEC_PATH + '/ARM/ARMCLANG/include'
+    LFLAGS += ' --libpath=' + EXEC_PATH + '/ARM/ARMCLANG/lib'
+
+    EXEC_PATH += '/ARM/ARMCLANG/bin/'
+
+    if BUILD == 'debug':
+        CFLAGS += ' -g -O1' # armclang recommend
+        AFLAGS += ' -g'
+    else:
+        CFLAGS += ' -O2'
+        
+    CXXFLAGS = CFLAGS
+
+    POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'
+
 elif PLATFORM == 'iar':
     # toolchains
     CC = 'iccarm'
diff --git a/components/drivers/spi/SConscript b/components/drivers/spi/SConscript
index e19f30861f..d6cb93f7f1 100644
--- a/components/drivers/spi/SConscript
+++ b/components/drivers/spi/SConscript
@@ -28,7 +28,10 @@ if GetDepend('RT_USING_SFUD'):
     if rtconfig.CROSS_TOOL == 'gcc':
         LOCAL_CCFLAGS += ' -std=c99'
     elif rtconfig.CROSS_TOOL == 'keil':
-        LOCAL_CCFLAGS += ' --c99'
+        if rtconfig.PLATFORM == 'armcc':
+            LOCAL_CCFLAGS += ' --c99'
+        elif rtconfig.PLATFORM == 'armclang':
+            LOCAL_CCFLAGS += ' -std=c99'
 
 src += src_device
 
diff --git a/libcpu/arm/cortex-m4/SConscript b/libcpu/arm/cortex-m4/SConscript
index 9ff30a796b..d03dfb9c07 100644
--- a/libcpu/arm/cortex-m4/SConscript
+++ b/libcpu/arm/cortex-m4/SConscript
@@ -11,6 +11,9 @@ CPPPATH = [cwd]
 if rtconfig.PLATFORM == 'armcc':
     src += Glob('*_rvds.S')
 
+if rtconfig.PLATFORM == 'armclang':
+    src += Glob('*_rvds.S')
+
 if rtconfig.PLATFORM == 'gcc':
     src += Glob('*_init.S')
     src += Glob('*_gcc.S')