[U-Boot] can't build u-boot-2010.12-rc2 for at91rm9200ek

[zzs213]

I download u-boot-2010.12-rc2 and make at91rm9200ek use the flowwing command

make O=../build at91rm9200ek

and get error message like this 

arm-linux-gcc   -D__ASSEMBLY__ -g  -Os   -fno-common -ffixed-r8 -msoft-float  -D__KERNEL__ -DCONFIG_SYS_TEXT_BASE=0x10000000 -I/home/zzs/DownLoad/uboot/xx/build/include2 -I/home/zzs/DownLoad/uboot/xx/build/include -I/home/zzs/DownLoad/uboot/xx/u-boot-2010.12-rc2/include -fno-builtin -ffreestanding -nostdinc -isystem /home/zzs/work/tools/eldk4.1/usr/bin/../lib/gcc/arm-linux/4.0.0/include -pipe  -DCONFIG_ARM -D__ARM__ -marm    -mabi=apcs-gnu  -mno-thumb-interwork  -march=armv4   \
        -o /home/zzs/DownLoad/uboot/xx/build/arch/arm/cpu/arm920t/start.o start.S -c
start.S: Assembler messages:
start.S:251: Error: bad arguments to instruction -- `add r1,r9'

It looks a illegal instruction in start.S

my toolchain is eldk4.1

anybody help me!!