update lm4f gcc compiler.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1958 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/lm4f232/rtconfig.py

@@ -30,10 +30,10 @@ if PLATFORM == 'gcc':
     OBJDUMP = PREFIX + 'objdump'
     OBJCPY = PREFIX + 'objcopy'
 
-    DEVICE = ' -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections'
+    DEVICE = ' -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=softfp -ffunction-sections -fdata-sections'
     CFLAGS = DEVICE 
     AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp'
-    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-stm32.map,-cref,-u,Reset_Handler -T stm32_rom.ld'
+    LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rtthread-stm32.map,-cref,-u,Reset_Handler -T lm4f_rom.ld'
 
     CPATH = ''
     LPATH = ''