make error!Can you help me ?

Hi,everybody.I encountered a error as the following when i compilered the uclinux kernel. I followed the steps like:

http://www.nioswiki.com/installnios2linux

My OS is ubuntu10.04

gcc is 4.2

Platform is DE2_70

Could anybody help to fix it,

Thanks.:)

----------------------------------------------------------

LD usr/built-in.o

{standard input}: Assembler messages:

{standard input}:96: Error: unrecognised instruction flushda

{standard input}:232: Error: unrecognised instruction flushda

{standard input}:365: Error: unrecognised instruction flushda

{standard input}:428: Error: unrecognised instruction flushda

make[3]: *** [arch/nios2/mm/memory.o] 错误 1

LD arch/nios2/drivers/built-in.o

make[2]: *** [arch/nios2/mm] 错误 2

make[2]: *** 正在等待未完成的任务....

make[2]: *** wait: 没有子进程。 停止。

make[1]: *** [sub-make] 错误 2

make[1]:正在离开目录 `/usr/local/src/nios2-linux/linux-2.6'

make: *** [linux] 错误 1

How can I fix it,Can you help me ? Thank you.