Hello world build error!

didn't you try

make ARCH=nios2nommu CROSS_COMPILE=nios2-linux-uclibc- -C ~/uClinux-dist/linux-2.6.x M=`pwd` modules

which you will need to compile device drivers

instead of

nios2-linux-uclibc-gcc linux-2.6.x/drivers/misc/hello.c -o hello -elf2flt="-s 4000"

which suits for user programm.

You will find detailed explanation in the kernel docs.

hope this helps, but i'm not a kernel crack

maybe you take a look at the nioswiki for the module programming example.

by the way let me ask you, what do you want to do?

do you want to write a device driver or a user program.