Whit is this error

I want to do download uclinux to altera DE2 flash but appear this error

/usr/local/src/nios2-linux/linux-2.6/arch/nios2/kernel/config.c:334: error: `na_ext_flash' undeclared here (not in a function)

/usr/local/src/nios2-linux/linux-2.6/arch/nios2/kernel/config.c:334: error: initializer element is not constant

/usr/local/src/nios2-linux/linux-2.6/arch/nios2/kernel/config.c:334: error: (near initialization for `nios2_flash_resource.start')

/usr/local/src/nios2-linux/linux-2.6/arch/nios2/kernel/config.c:335: error: `na_ext_flash_end' undeclared here (not in a function)

/usr/local/src/nios2-linux/linux-2.6/arch/nios2/kernel/config.c:335: error: initializer element is not constant

/usr/local/src/nios2-linux/linux-2.6/arch/nios2/kernel/config.c:335: error: (near initialization for `nios2_flash_resource.end')

Please,some people know how to solve