What is the meaning of Small C library

Hi,

I tried all sorts things like;

increasing on chip memory to 50KB , all works fine only when I enable small C library.

But If I enable small C library along with perfomance counter, I c that perfomance counter stays in reset state itself.

can u think of anything else where I can rid of this small C library, I included SDRAM controller, build is fine.. but I am not able to downlaod it to fpga it says

"no Nios II core found

leaving target processor"

why is this because of?.

I just added a SDRAM controller of width 16 bits and On chip ram of 50KB and gave CPU with SDRAM as reset vector and exception vector.

Is there anything which I left out and anything istake I have done?.

Thanks,

Anand