diff --git a/bsp/at91sam9260/SConstruct b/bsp/at91sam9260/SConstruct
index 8894d3385..0be072090 100755
--- a/bsp/at91sam9260/SConstruct
+++ b/bsp/at91sam9260/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/at91sam9260/rtconfig.py b/bsp/at91sam9260/rtconfig.py
index 5ae68e7a6..629819577 100755
--- a/bsp/at91sam9260/rtconfig.py
+++ b/bsp/at91sam9260/rtconfig.py
@@ -1,3 +1,4 @@
+import os
 
 # toolchains options
 ARCH     = 'arm'
@@ -6,12 +7,24 @@ TextBase = '0x20000000'
 
 CROSS_TOOL 	= 'gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= '/opt/arm-2010q1/bin/'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'E:/Keil'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 #BUILD = 'debug'
 BUILD = 'release'
 
@@ -69,14 +82,3 @@ elif PLATFORM == 'armcc':
         CFLAGS += ' -O2'
 
     POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'
-
-elif PLATFORM == 'iar':
-    # toolchains
-    CC = 'armcc'
-    AS = 'armasm'
-    AR = 'armar'
-    LINK = 'armlink'
-
-    CFLAGS = ''
-    AFLAGS = ''
-    LFLAGS = ''
diff --git a/bsp/avr32uc3b0/SConstruct b/bsp/avr32uc3b0/SConstruct
index 209b762de..3354b662b 100644
--- a/bsp/avr32uc3b0/SConstruct
+++ b/bsp/avr32uc3b0/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
  
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
  
diff --git a/bsp/avr32uc3b0/rtconfig.py b/bsp/avr32uc3b0/rtconfig.py
index 09292421c..4325e7e33 100644
--- a/bsp/avr32uc3b0/rtconfig.py
+++ b/bsp/avr32uc3b0/rtconfig.py
@@ -1,3 +1,4 @@
+import os
 
 # toolchains options
 ARCH     = 'avr32'
@@ -7,9 +8,26 @@ BOARD    = 'USERBOARD'
 
 CROSS_TOOL 	= 'gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'C:/Program Files/Atmel/AVR Tools/AVR Toolchain/bin'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 #BUILD = 'debug'
 BUILD = 'release'
 
diff --git a/bsp/dev3210/SConstruct b/bsp/dev3210/SConstruct
index 061f72606..e588dcb59 100644
--- a/bsp/dev3210/SConstruct
+++ b/bsp/dev3210/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/dev3210/rtconfig.py b/bsp/dev3210/rtconfig.py
index 07f52db14..a2e008214 100644
--- a/bsp/dev3210/rtconfig.py
+++ b/bsp/dev3210/rtconfig.py
@@ -1,11 +1,32 @@
+import os
+
 # CPU options
 ARCH='mips'
 CPU ='loongson'
 
 # toolchains options
 CROSS_TOOL  = 'gcc'
-PLATFORM    = 'gcc'
-EXEC_PATH   = 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
+if  CROSS_TOOL == 'gcc':
+	PLATFORM    = 'gcc'
+	EXEC_PATH   = 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD       = 'debug'
 
 PREFIX = 'mips-sde-elf-'
diff --git a/bsp/efm32/SConstruct b/bsp/efm32/SConstruct
index 2774838d1..b431b30bc 100644
--- a/bsp/efm32/SConstruct
+++ b/bsp/efm32/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/efm32/rtconfig.py b/bsp/efm32/rtconfig.py
index d4dd86343..fbaab68eb 100644
--- a/bsp/efm32/rtconfig.py
+++ b/bsp/efm32/rtconfig.py
@@ -1,12 +1,30 @@
+import os
+
 # toolchains options
 ARCH        = 'arm'
 CPU         = 'cortex-m3'
 CROSS_TOOL  = 'gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
     EXEC_PATH   = 'C:\Program Files (x86)\CodeSourcery\Sourcery G++ Lite\bin'
     #EXEC_PATH  = 'C:\Program Files (x86)\yagarto\bin'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
 BUILD = 'debug'
 # EFM32_BOARD		=  'EFM32_G8XX_STK'
diff --git a/bsp/jz47xx/rtconfig.py b/bsp/jz47xx/rtconfig.py
index ea679a279..c2a61a05c 100644
--- a/bsp/jz47xx/rtconfig.py
+++ b/bsp/jz47xx/rtconfig.py
@@ -1,9 +1,31 @@
+import os
+
 # toolchains options
 ARCH     = 'mips'
 CPU      = 'jz47xx'
+
 CROSS_TOOL  = 'gcc'
-PLATFORM 	= 'gcc'
-EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
+if  CROSS_TOOL == 'gcc':
+	PLATFORM 	= 'gcc'
+	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+	
 BUILD		= 'debug'
 
 # toolchains
diff --git a/bsp/lm3s8962/SConstruct b/bsp/lm3s8962/SConstruct
index 12d70ecd1..b573f7b0c 100644
--- a/bsp/lm3s8962/SConstruct
+++ b/bsp/lm3s8962/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/lm3s8962/rtconfig.py b/bsp/lm3s8962/rtconfig.py
index 9c753dee7..8c04ba5b7 100644
--- a/bsp/lm3s8962/rtconfig.py
+++ b/bsp/lm3s8962/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL 	= 'keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 #device options
 PART_TYPE = 'PART_LM3S8962'
 
@@ -12,6 +17,15 @@ if  CROSS_TOOL == 'gcc':
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'E:/Keil'
+elif CROSS_TOOL == 'iar':	
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)	
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/lm3s9b9x/SConstruct b/bsp/lm3s9b9x/SConstruct
index 5439cdbb5..b657849d8 100644
--- a/bsp/lm3s9b9x/SConstruct
+++ b/bsp/lm3s9b9x/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/lm3s9b9x/rtconfig.py b/bsp/lm3s9b9x/rtconfig.py
index 40e9a3ca6..3c444b9ae 100644
--- a/bsp/lm3s9b9x/rtconfig.py
+++ b/bsp/lm3s9b9x/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL 	= 'keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 #device options
 PART_TYPE = 'PART_LM3S9B96'
 
@@ -12,6 +17,15 @@ if  CROSS_TOOL == 'gcc':
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'E:/Keil'
+elif CROSS_TOOL == 'iar':	
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/lm4f232/SConstruct b/bsp/lm4f232/SConstruct
index 0753a9976..48e3a1695 100644
--- a/bsp/lm4f232/SConstruct
+++ b/bsp/lm4f232/SConstruct
@@ -2,7 +2,10 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
 
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
diff --git a/bsp/lm4f232/rtconfig.py b/bsp/lm4f232/rtconfig.py
index 94715db7b..3c951e4e4 100644
--- a/bsp/lm4f232/rtconfig.py
+++ b/bsp/lm4f232/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m4'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 #device options
 PART_TYPE = 'PART_LM4F232H5QD'
 
@@ -14,7 +19,14 @@ if  CROSS_TOOL == 'gcc':
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'E:/Keil'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)	
 
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
 BUILD = 'debug'
 
diff --git a/bsp/lpc178x/SConstruct b/bsp/lpc178x/SConstruct
index ff91371b2..5522d3f89 100644
--- a/bsp/lpc178x/SConstruct
+++ b/bsp/lpc178x/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/lpc178x/lpc17xx_rom.sct b/bsp/lpc178x/lpc17xx_rom.sct
new file mode 100644
index 000000000..893f49ce4
--- /dev/null
+++ b/bsp/lpc178x/lpc17xx_rom.sct
@@ -0,0 +1,15 @@
+; *************************************************************
+; *** Scatter-Loading Description File generated by uVision ***
+; *************************************************************
+
+LR_IROM1 0x00000000 0x00080000  {    ; load region size_region
+  ER_IROM1 0x00000000 0x00080000  {  ; load address = execution address
+   *.o (RESET, +First)
+   *(InRoot$$Sections)
+   .ANY (+RO)
+  }
+  RW_IRAM1 0x10000000 0x00010000  {  ; RW data
+   .ANY (+RW +ZI)
+  }
+}
+
diff --git a/bsp/lpc178x/rtconfig.py b/bsp/lpc178x/rtconfig.py
index 11c425ff9..563590ffb 100644
--- a/bsp/lpc178x/rtconfig.py
+++ b/bsp/lpc178x/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
@@ -12,6 +17,10 @@ elif CROSS_TOOL == 'keil':
 elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	EXEC_PATH 	= 'E:/Program Files/IAR Systems/Embedded Workbench 6.0/arm/bin'
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/lpc2148/SConstruct b/bsp/lpc2148/SConstruct
index fcf718909..8793f636f 100644
--- a/bsp/lpc2148/SConstruct
+++ b/bsp/lpc2148/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/lpc2148/rtconfig.py b/bsp/lpc2148/rtconfig.py
index 8e90bd334..b3eb6d370 100644
--- a/bsp/lpc2148/rtconfig.py
+++ b/bsp/lpc2148/rtconfig.py
@@ -1,14 +1,27 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='lpc214x'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'D:/SourceryGCC/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'G:\Keil_MDK_380'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)	
+	
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')	
 
 BUILD = 'debug'
 
diff --git a/bsp/lpc2478/SConstruct b/bsp/lpc2478/SConstruct
index 4eade96f4..beaeb46b5 100644
--- a/bsp/lpc2478/SConstruct
+++ b/bsp/lpc2478/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/lpc2478/rtconfig.py b/bsp/lpc2478/rtconfig.py
index ee4345b76..3c92ab0be 100644
--- a/bsp/lpc2478/rtconfig.py
+++ b/bsp/lpc2478/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='lpc24xx'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
@@ -12,6 +17,15 @@ elif CROSS_TOOL == 'keil':
 elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	EXEC_PATH 	= 'E:/Program Files/IAR Systems/Embedded Workbench 6.0/arm/bin'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/ls1bdev/SConstruct b/bsp/ls1bdev/SConstruct
index d76d68a4a..5bb32bcfc 100644
--- a/bsp/ls1bdev/SConstruct
+++ b/bsp/ls1bdev/SConstruct
@@ -6,6 +6,7 @@ if os.getenv('RTT_ROOT'):
     RTT_ROOT = os.getenv('RTT_ROOT')
 else:
     RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/ls1bdev/rtconfig.py b/bsp/ls1bdev/rtconfig.py
index 336c94df3..3f9787e5a 100644
--- a/bsp/ls1bdev/rtconfig.py
+++ b/bsp/ls1bdev/rtconfig.py
@@ -1,11 +1,32 @@
+import os
+
 # CPU options
 ARCH='mips'
 CPU ='loongson_1b'
 
 # toolchains options
 CROSS_TOOL  = 'gcc'
-PLATFORM    = 'gcc'
-EXEC_PATH   = 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
+
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
+if  CROSS_TOOL == 'gcc':
+	PLATFORM    = 'gcc'
+	EXEC_PATH   = 'C:/Program Files/CodeSourcery/Sourcery_CodeBench_Lite_for_MIPS_ELF/bin'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD       = 'debug'
 
 PREFIX = 'mips-sde-elf-'
diff --git a/bsp/m16c62p/SConstruct b/bsp/m16c62p/SConstruct
index 7d8c0b0cd..0910c85b9 100644
--- a/bsp/m16c62p/SConstruct
+++ b/bsp/m16c62p/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/m16c62p/rtconfig.py b/bsp/m16c62p/rtconfig.py
index 6bb29ea76..3ed4a874b 100644
--- a/bsp/m16c62p/rtconfig.py
+++ b/bsp/m16c62p/rtconfig.py
@@ -1,9 +1,14 @@
+import os
+
 # toolchains options
 ARCH     = 'm16c'
 CPU      = 'm16c62p'
 
 CROSS_TOOL 	= 'iar'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
@@ -11,6 +16,14 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH = 'C:/Program Files/IAR Systems/Embedded Workbench Evaluation 6.0'
 #	EXEC_PATH 	= 'C:/Program Files/IAR Systems/Embedded Workbench Evaluation 6.0'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)	
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
 BUILD = 'debug'
 
diff --git a/bsp/mb9bf500r/rtconfig.py b/bsp/mb9bf500r/rtconfig.py
index 5b3885eba..bd93a40ba 100644
--- a/bsp/mb9bf500r/rtconfig.py
+++ b/bsp/mb9bf500r/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL='gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 # cross_tool provides the cross compiler
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 
@@ -16,6 +21,9 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'C:/Program Files/IAR Systems/Embedded Workbench 6.0 Evaluation'
 
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/mb9bf506r/fm3_rom.sct b/bsp/mb9bf506r/fm3_rom.sct
new file mode 100644
index 000000000..6a8744246
--- /dev/null
+++ b/bsp/mb9bf506r/fm3_rom.sct
@@ -0,0 +1,15 @@
+; *************************************************************
+; *** Scatter-Loading Description File generated by uVision ***
+; *************************************************************
+
+LR_IROM1 0x00000000 0x00080000  {    ; load region size_region
+  ER_IROM1 0x00000000 0x00080000  {  ; load address = execution address
+   *.o (RESET, +First)
+   *(InRoot$$Sections)
+   .ANY (+RO)
+  }
+  RW_IRAM1 0x20000000 0x00008000  {  ; RW data
+   .ANY (+RW +ZI)
+  }
+}
+
diff --git a/bsp/mb9bf506r/rtconfig.py b/bsp/mb9bf506r/rtconfig.py
index 5d6ae3831..ccc29b05f 100644
--- a/bsp/mb9bf506r/rtconfig.py
+++ b/bsp/mb9bf506r/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL='gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 # cross_tool provides the cross compiler
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 
@@ -16,6 +21,9 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'C:/Program Files/IAR Systems/Embedded Workbench 6.0 Evaluation'
 
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
@@ -56,7 +64,7 @@ elif PLATFORM == 'armcc':
     DEVICE = ' --device DARMSTM'
     CFLAGS = DEVICE + ' --apcs=interwork'
     AFLAGS = DEVICE
-    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rtthread-stm32.map --scatter stm32_rom.sct'
+    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rtthread-fm3.map --scatter fm3_rom.sct'
 
     CFLAGS += ' -I' + EXEC_PATH + '/ARM/RV31/INC'
     LFLAGS += ' --libpath ' + EXEC_PATH + '/ARM/RV31/LIB'
diff --git a/bsp/mini2440/rtconfig.py b/bsp/mini2440/rtconfig.py
index fe8a5121b..55158a1ad 100644
--- a/bsp/mini2440/rtconfig.py
+++ b/bsp/mini2440/rtconfig.py
@@ -1,3 +1,5 @@
+import os
+
 # panel options
 # 'PNL_A70','PNL_N35', 'PNL_T35' , 'PNL_X35'
 RT_USING_LCD_TYPE = 'PNL_T35'
@@ -9,12 +11,24 @@ TextBase = '0x30000000'
 
 CROSS_TOOL 	= 'gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'C:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'C:/Keil'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/mini4020/SConstruct b/bsp/mini4020/SConstruct
index dd50916df..4d4aa1290 100644
--- a/bsp/mini4020/SConstruct
+++ b/bsp/mini4020/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/mini4020/rtconfig.py b/bsp/mini4020/rtconfig.py
index d111a2004..2e2fb3c4e 100644
--- a/bsp/mini4020/rtconfig.py
+++ b/bsp/mini4020/rtconfig.py
@@ -1,15 +1,29 @@
+import os
+
 # toolchains options
 ARCH     = 'arm'
 CPU      = 'sep4020'
 
 CROSS_TOOL 	= 'keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'c:/Keil'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
@@ -65,14 +79,3 @@ elif PLATFORM == 'armcc':
         CFLAGS += ' -O2'
 
     POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'
-
-elif PLATFORM == 'iar':
-    # toolchains
-    CC = 'armcc'
-    AS = 'armasm'
-    AR = 'armar'
-    LINK = 'armlink'
-
-    CFLAGS = ''
-    AFLAGS = ''
-    LFLAGS = ''
diff --git a/bsp/sam7x/rtconfig.py b/bsp/sam7x/rtconfig.py
index ba912d8c9..18b19fc1b 100644
--- a/bsp/sam7x/rtconfig.py
+++ b/bsp/sam7x/rtconfig.py
@@ -1,3 +1,5 @@
+import os
+
 # panel options
 # 'PNL_A70','PNL_N35', 'PNL_T35'
 RT_USING_LCD_TYPE = 'PNL_T35'
@@ -8,12 +10,24 @@ CPU      = 'AT91SAM7X'
 
 CROSS_TOOL 	= 'gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'C:/Program Files/CodeSourcery/Sourcery G++ Lite/bin'
 elif CROSS_TOOL == 'keil':
 	PLATFORM 	= 'armcc'
 	EXEC_PATH 	= 'C:/Keil'
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/stm32f107/SConstruct b/bsp/stm32f107/SConstruct
index 63b1130d6..8929042d1 100644
--- a/bsp/stm32f107/SConstruct
+++ b/bsp/stm32f107/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/stm32f107/rtconfig.py b/bsp/stm32f107/rtconfig.py
index 8128d0f6e..1898385df 100644
--- a/bsp/stm32f107/rtconfig.py
+++ b/bsp/stm32f107/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 # cross_tool provides the cross compiler
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 
@@ -16,6 +21,9 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'E:/Program Files/IAR Systems/Embedded Workbench 6.0'
 
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 STM32_TYPE = 'STM32F10X_CL'
 
diff --git a/bsp/stm32f10x/SConstruct b/bsp/stm32f10x/SConstruct
index ec0c09d39..3f3a7a12a 100644
--- a/bsp/stm32f10x/SConstruct
+++ b/bsp/stm32f10x/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/stm32f10x/rtconfig.py b/bsp/stm32f10x/rtconfig.py
index dfb852977..e5f70f961 100644
--- a/bsp/stm32f10x/rtconfig.py
+++ b/bsp/stm32f10x/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 #device options
 # STM32_TYPE = 
 # 'STM32F10X_LD','STM32F10X_LD_VL',
@@ -28,6 +33,9 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'E:/Program Files/IAR Systems/Embedded Workbench 6.0'
 
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/stm32f20x/SConstruct b/bsp/stm32f20x/SConstruct
index 63b1130d6..8929042d1 100644
--- a/bsp/stm32f20x/SConstruct
+++ b/bsp/stm32f20x/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/stm32f20x/rtconfig.py b/bsp/stm32f20x/rtconfig.py
index 2cbfe93d4..fde53fd12 100644
--- a/bsp/stm32f20x/rtconfig.py
+++ b/bsp/stm32f20x/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m3'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'E:/SourceryGCC/bin'
@@ -13,6 +18,9 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'E:/Program Files/IAR Systems/Embedded Workbench 5.4 Evaluation_0'	
 
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 
 if PLATFORM == 'gcc':
diff --git a/bsp/stm32f40x/SConstruct b/bsp/stm32f40x/SConstruct
index d16ef0dcb..59aac6b57 100644
--- a/bsp/stm32f40x/SConstruct
+++ b/bsp/stm32f40x/SConstruct
@@ -2,7 +2,10 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
 
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
diff --git a/bsp/stm32f40x/rtconfig.py b/bsp/stm32f40x/rtconfig.py
index e1811e6da..55be67bbd 100644
--- a/bsp/stm32f40x/rtconfig.py
+++ b/bsp/stm32f40x/rtconfig.py
@@ -1,8 +1,13 @@
+import os
+
 # toolchains options
 ARCH='arm'
 CPU='cortex-m4'
 CROSS_TOOL='keil'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 # cross_tool provides the cross compiler
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
@@ -15,7 +20,9 @@ elif CROSS_TOOL == 'iar':
 	PLATFORM 	= 'iar'
 	IAR_PATH 	= 'E:/Program Files/IAR Systems/Embedded Workbench 6.0'
 
-#
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
+
 BUILD = 'debug'
 STM32_TYPE = 'STM32F4XX'
 
diff --git a/bsp/x86/SConstruct b/bsp/x86/SConstruct
index 061f72606..e588dcb59 100644
--- a/bsp/x86/SConstruct
+++ b/bsp/x86/SConstruct
@@ -2,7 +2,11 @@ import os
 import sys
 import rtconfig
 
-RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+if os.getenv('RTT_ROOT'):
+    RTT_ROOT = os.getenv('RTT_ROOT')
+else:
+    RTT_ROOT = os.path.normpath(os.getcwd() + '/../..')
+
 sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]
 from building import *
 
diff --git a/bsp/x86/rtconfig.py b/bsp/x86/rtconfig.py
index 19452a16a..06011252a 100644
--- a/bsp/x86/rtconfig.py
+++ b/bsp/x86/rtconfig.py
@@ -1,14 +1,32 @@
+import os
+
 # toolchains options
 ARCH='ia32'
 CPU=''
 CROSS_TOOL='gcc'
 
+if os.getenv('RTT_CC'):
+	CROSS_TOOL = os.getenv('RTT_CC')
+
 # cross_tool provides the cross compiler
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery,
 
 if  CROSS_TOOL == 'gcc':
 	PLATFORM 	= 'gcc'
 	EXEC_PATH 	= 'E:/Program Files/CodeSourcery/Sourcery_CodeBench_Lite_for_IA32_ELF/bin'
+elif CROSS_TOOL == 'keil':
+    print '================ERROR============================'
+    print 'Not support keil yet!'
+    print '================================================='
+    exit(0)
+elif CROSS_TOOL == 'iar':
+    print '================ERROR============================'
+    print 'Not support iar yet!'
+    print '================================================='
+    exit(0)
+
+if os.getenv('RTT_EXEC_PATH'):
+	EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
 BUILD = 'debug'