diff --git a/bsp/m16c62p/SConstruct b/bsp/m16c62p/SConstruct
index f4c22f1062c9d74d8dabffdbf728e5d99af968d0..7d8c0b0cd6a907b0358353c182775cce7492c262 100644
--- a/bsp/m16c62p/SConstruct
+++ b/bsp/m16c62p/SConstruct
@@ -12,11 +12,14 @@ env = Environment(tools = ['mingw'],
 	AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
 	CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
 	AR = rtconfig.AR, ARFLAGS = '-rc',
-	LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS,
-	CCCOM = ['$CC $CCFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS -o $TARGET $SOURCES'],
-    LINKCOM = ['$LINK $SOURCES $LINKFLAGS -f lnkm30627fhp.xcl -l rtt2m16c.map -o rtt2m16c.d34 -Omotorola-s28=$TARGET'])
+	LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
 env.PrependENVPath('PATH', rtconfig.EXEC_PATH)
 
+if rtconfig.PLATFORM == 'iar':
+	env.Replace(CCCOM = ['$CC $CCFLAGS $CPPFLAGS $_CPPDEFFLAGS $_CPPINCFLAGS -o $TARGET $SOURCES'])
+	env.Replace(LINKCOM = ['$LINK $SOURCES $LINKFLAGS -f lnkm30627fhp.xcl -l rtt2m16c.map -o rtt2m16c.d34 -Omotorola-s28=$TARGET'])
+	env.Replace(ARFLAGS = '')
+	
 Export('RTT_ROOT')
 Export('rtconfig')
 
diff --git a/libcpu/m16c/m16c62p/context_iar.S b/libcpu/m16c/m16c62p/context_iar.S
index 0a7aa5af7619a408b7679b4a64415bc0aa6a734b..bd75341f4b5cdc6a2aa1c1080b15e1e6f5e7e37f 100644
--- a/libcpu/m16c/m16c62p/context_iar.S
+++ b/libcpu/m16c/m16c62p/context_iar.S
@@ -23,15 +23,12 @@
 
     RSEG    CODE(1)
 
-    EXTERN  rt_thread_switch_interrupt_flag
     EXTERN  rt_interrupt_from_thread
     EXTERN  rt_interrupt_to_thread
 
     PUBLIC  rt_hw_interrupt_disable
     PUBLIC  rt_hw_interrupt_enable
     PUBLIC  rt_hw_context_switch_to
-    PUBLIC  rt_hw_context_switch
-    PUBLIC  rt_hw_context_switch_interrupt
     PUBLIC  os_context_switch
 
 rt_hw_interrupt_disable:
@@ -66,19 +63,4 @@ rt_hw_context_switch_to:
     POPM    R0,R1,R2,R3,A0,A1,SB,FB
     REIT
 
-rt_hw_context_switch:
-    MOV.W   R0, rt_interrupt_from_thread
-    MOV.W   R1, rt_interrupt_to_thread
-    INT     #0                                   ;software interrupt 0
-    RTS
-  
-rt_hw_context_switch_interrupt:
-    CMP.W   #1, rt_thread_switch_interrupt_flag
-    JEQ     jump
-    MOV.W   #1, rt_thread_switch_interrupt_flag
-    MOV.W   R0, rt_interrupt_from_thread
-jump
-    MOV.W   R1, rt_interrupt_to_thread
-    RTS
-
     END