Hi, My image was built with arm-none-eabi-xxx tool chain(2008-q3). And the compile options as follow. FCFLAG = -msoft-float -mfloat-abi=soft -mno-apcs-float FAFLAG = -msoft-float -mfloat-abi=soft CFLAG = -mcpu=cortex-a8 $(FCFLAG) -Wall -Wpointer-arith -Wstrict-prototypes -Winline -Wundef -mapcs -g -O0 -ffunction-sections -fdata-sections -fno-exceptions -I. AFLAG = -mcpu=cortex-a8 $(FAFLAG) -Wall -Wundef -mapcs -g -O0 -I. -lc -nostartfiles -T src/mx53_iram.ld In the main.c file , I used printf("%f",1.0f); to print a float number but the output is 0.0000. Can anybody help me to figure that out, pls? BR Jerry