An error during compiling

hi,

i'm a freshman in embedded.my target board is cyclone2 ep2c35(with 48k total ram bits on chip,105 M4k memory blocks). the components i added into my design as follows:

a processor,on chip memory(16kbytes ram) ,lcd_display,jtag uart,pio

my program :# include "alt_types.h"# include <stdio.h># include <unistd.h># include "system.h"# include "sys/alt_irq.h"# include "altera_avalon_pio_regs.h"

...

FILE * lcd;

lcd = fopen("/dev/lcd_display", "w");

.......

i select "small C library" and "reduced device drivers" options

i encounter two questions while compiling

1)i can&#39;t use the fopen function,the error msg during compiling:

obj/count_binary.o(.text+0x98): In function `main&#39;:

../count_binary.c:22: undefined reference to `fopen

collect2: ld returned 1 exit status

make: *** [count_binary_3.elf] Error 1

Build completed

finally i use printf instead.and the program can run on the "nios/s" core;

when i run it on my core descibed above, i came across another problem

2)

Linking count_binary_3.elf...

/cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/

gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: region onchip_memory_0 is

full (count_binary_3.elf section .text). Region needs to be 42168 bytes

larger.

/cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/

gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: region onchip_memory_0 is

full (count_binary_3.elf section .rwdata). Region needs to be 652 bytes

larger.

/cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/

gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .rodata [00000020

-> 00000737] overlaps section .exceptions [00000020 -> 000001c7]

/cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/

gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .rwdata [00000738

-> 0000228b] overlaps section .text [000001c8 -> 0000c4b7]

/cygdrive/c/altera/kits/nios2/bin/nios2-gnutools/H-i686-pc-cygwin/bin/../lib/

gcc/nios2-elf/3.4.1/../../../../nios2-elf/bin/ld: section .bss [00000020 ->

00000257] overlaps section .exceptions [00000020 -> 000001c7]

obj/count_binary.o(.text+0xc8): In function `count_lcd&#39;:

../count_binary.c:60: Unable to reach (at 0x00000034) from the global

pointer (at 0x0000a210) because the offset (-41436) is out of the allowed

range, -32678 to 32767.

is it necessary to add an extern memory?

if yes,how can i do it?because i looked through the nios2 sw&hw dev handbook but can&#39;t find the introduction of steps to add a extern ram

can anyone help me?

thank u for your attention