Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Nios2 problem

Hi,

I am trying to run a simple code of led blinking but I get this error

Description Resource Path Location Type

led_nois.elf: section .exceptions lma 0x1020 overlaps previous sections led_nois line 0 C/C++ Problem

led_nois.elf: section .text lma 0x11b4 overlaps previous sections led_nois line 0 C/C++ Problem

make: *** [led_nois.elf] Error 1 led_nois line 0 C/C++ Problem

region onchip_mem is full (led_nois.elf section .text) led_nois line 0 C/C++ Problem

section .exceptions [00001020 -> 000011b3] overlaps section .rodata [00001020 -> 00001067] led_nois line 0 C/C++ Problem

section .rwdata [00002ab0 -> 000044f7] overlaps section .text [000011b4 -> 000064ff] led_nois line 0 C/C++ Problem

The code is

# include <stdio.h># include "system.h"# include "altera_avalon_pio_regs.h"

int main ()

{

int i;

//Send a message to console

printf("Hello from Nios II!\n");

//Blink the LEDs in a counting-up manner from 0 to 255

for(i=0;i<256;i++)

{

/*This writes values to the LEDs using macro defined in altera_avalon_pio_regs.h

This macro accepts two arguments: the base address of the PIO and the value that will be written to the PIO.

In this example, the PIO base address is defined in the system.h file to be LED_PIO_BASE.*/

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,i);

}

return 0;

}

Its a pretty simple code with simple sopc design of a processor,led,jtag and uart,onchip mem.

onchip mem = 4kb...But i still get the erorr of onchip mem full when I compile the code.I dont know why?

Apart from the demo code any code I try to run has the same error

Help :confused:

6 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    Using printf() pulls in quite a lot of code from libc, you'll need about 64k. You can use a smaller libc and smaller functions than printf() to get code to run in smaller memory blocks.

    Doing anything in 4k using any of the altera libc code is rather optimistic! If you write everything yourself (and don't want anything like printf) it can be done.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    first go to your bsp editor (right click on project->nios2) and enable the small c library. then change your printf() to alt_printf() this is a shredded down version of printf which lacks certain formatting functions. but since you're not doing any formatting it should be the same. and dont include stdio.h alt_printf is in the hal library

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    Assuming you don't need much formatting you might want to try including "alt_stdio.h" and using alt_printf(). Search for reducing code footprint in the Nios II software developer handbook to find out more details.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    There is also a problem that I am not able to select more than 4kb of onchip memory.It gives me an error of

    Error: cpu_0.instruction_master: onchip_memory2_0.s1 cannot be at 0x2000 (0x0 or 0x10000 are acceptable)

    Error: cpu_0.data_master: onchip_memory2_0.s1 cannot be at 0x2000 (0x0 or 0x10000 are acceptable)

    Is this a problem because I downloaded the free version from the internet.All the design examples the onchip memory is 64kb.When I run them there is no problem.But if I make a design it doesnot allow to select more than 4kb

    Why is that so?
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    are you trying to assign this memory at the sopc builder? the error looks like an address conflict to me. try 'auto assign base addresses' from the system menu after changing to 64k