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ARM Projects Beginner Questions [message #789971]

Fri, 03 February 2012 16:31

Vahid AA

Messages: 1
Registered: February 2012

Junior Member

Dear Friends
I'm beginner in ARM Projects development, and I wanted to start with run a simple "Hello world" on my OK6410 Board. My board processor is ARM 1176jzf-s.
I used Eclipse CDT and installed Sourcery_CodeBench_Lite_for_ARM_EABI on windows 7 platform and add GNU ARM Eclipse Plug-in.
my program:
#include "stdio.h"

int main(void) {
printf("Hello world !\n");
return 0;
}

When I wants to build my hello world project I get these errors:

**** Build of configuration Debug for project helloarm ****

cs-make all
Building target: helloarm.elf
Invoking: ARM Sourcery Windows GCC C Linker
arm-none-eabi-gcc -Wl,-Map,helloarm.map -mcpu=arm1176jzf-s -mthumb -g3 -o "helloarm.elf" ./hello.o
cygwin warning:
MS-DOS style path detected: D:\workspace\helloarm\Debug
Preferred POSIX equivalent is: /cygdrive/d/workspace/helloarm/Debug
CYGWIN environment variable option "nodosfilewarning" turns off this warning.

c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/bin/ld.exe: warning: cannot find entry symbol _start; defaulting to 0000800c
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-sbrkr.o): In function `_sbrk_r':
sbrkr.c:(.text+0xc): undefined reference to `_sbrk'
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-writer.o): In function `_write_r':
writer.c:(.text+0x10): undefined reference to `_write'
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-closer.o): In function `_close_r':
closer.c:(.text+0xc): undefined reference to `_close'
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-fstatr.o): In function `_fstat_r':
fstatr.c:(.text+0xe): undefined reference to `_fstat'
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-isattyr.o): In function `_isatty_r':
isattyr.c:(.text+0xc): undefined reference to `_isatty'
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-lseekr.o): In function `_lseek_r':
lseekr.c:(.text+0x10): undefined reference to `_lseek'
c:/codesourcery/bin/../lib/gcc/arm-none-eabi/4.6.1/../../../../arm-none-eabi/lib/thumb\libc.a(lib_a-readr.o): In function `_read_r':
readr.c:(.text+0x10): undefined reference to `_read'
collect2: ld returned 1 exit status
cs-make: *** [helloarm.elf] Error 1

**** Build Finished ****

I think these errors related to linker but I cannot find the solution could you please help me?!
thanks

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Re: ARM Projects Beginner Questions [message #803525 is a reply to message #789971]

Tue, 21 February 2012 13:01

Hard Maker

Messages: 4
Registered: February 2012

Junior Member

Hi,
The problem is you need to add the implementation of "syscalls". When use printf function (as others library functions), newlib call low level functions called "syscalls", this functions do architecture specific task. Think this: if you have 2 boards, one using a text lcd display and the other with graphical display is not the same send text for each one. Syscalls port hight level functions to work with diferent hardware. To know how you can write this functions, read the "newlib manual", chapter 12 (syscalls).
Good luck

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