M3 (lm3s818) linkerfileproblem

[Jens B. (sio2)]

Wenn ich mein Projekt kompilere kommt als Fehler
../arm-none-eabi/bin/ld: section .ARM.exidx loaded at 
[0000782c,00007833] overlaps section .data loaded at [0000782c,00007d37]
/opt/CodeSourcery/Sourcery_G++_Lite/bin/../lib/gcc/arm-none-eabi/4.4.1/. 
./../../../arm-none-eabi/lib/thumb2/libc.a(lib_a-sbrkr.o):  In function 
`_sbrk_r':
sbrkr.c:(.text+0x12): undefined reference to `_sbrk'

Wenn ich jetzt mir das Linkerfile ansehe (ich hab nicht wirklich Ahnung 
davon) sieht es aber so aus, als ob .data eigentlich an 0x20000000 gehen 
sollte. Wo liegt das Problem.

MEMORY
{
    FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x10000
    SRAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x2000
}

/* Section Definitions */
SECTIONS
{
   .text :
  {
  KEEP(*(.isr_vector .isr_vector.*))
  *(.text .text.*)
  *(.gnu.linkonce.t.*)
  *(.glue_7)
  *(.glue_7t)
  *(.gcc_except_table)
  *(.rodata .rodata*)
  *(.gnu.linkonce.r.*)
  _etext = .;
  } > FLASH
   
  .data : AT (_etext)
  {
  _data = .;
  *(vtable vtable.*)
  *(.data .data.*)
  *(.gnu.linkonce.d*)
  . = ALIGN(4);
  _edata = . ;
  } > SRAM
 
  /* .bss section which is used for uninitialized data */
  .bss (NOLOAD) :
  {
    _bss = . ;
    *(.bss .bss.*)
    *(.gnu.linkonce.b*)
    *(COMMON)
  . = ALIGN(4);
  _ebss = . ;
  } > SRAM
  
  .stackarea (NOLOAD) :
  {
    . = ALIGN(8);
  *(.stackarea .stackarea.*)
  . = ALIGN(8);
  } > SRAM
  
  . = ALIGN(4);
  _end = . ;
  PROVIDE (end = .);

  /* Stabs debugging sections.  */
  .stab          0 : { *(.stab) }
  .stabstr       0 : { *(.stabstr) }
  .stab.excl     0 : { *(.stab.excl) }
  .stab.exclstr  0 : { *(.stab.exclstr) }
  .stab.index    0 : { *(.stab.index) }
  .stab.indexstr 0 : { *(.stab.indexstr) }
  .comment       0 : { *(.comment) }
  /* DWARF debug sections.
     Symbols in the DWARF debugging sections are relative to the beginning
     of the section so we begin them at 0.  */
  /* DWARF 1 */
  .debug          0 : { *(.debug) }
  .line           0 : { *(.line) }
  /* GNU DWARF 1 extensions */
  .debug_srcinfo  0 : { *(.debug_srcinfo) }
  .debug_sfnames  0 : { *(.debug_sfnames) }
  /* DWARF 1.1 and DWARF 2 */
  .debug_aranges  0 : { *(.debug_aranges) }
  .debug_pubnames 0 : { *(.debug_pubnames) }
  /* DWARF 2 */
  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
  .debug_abbrev   0 : { *(.debug_abbrev) }
  .debug_line     0 : { *(.debug_line) }
  .debug_frame    0 : { *(.debug_frame) }
  .debug_str      0 : { *(.debug_str) }
  .debug_loc      0 : { *(.debug_loc) }
  .debug_macinfo  0 : { *(.debug_macinfo) }
  /* SGI/MIPS DWARF 2 extensions */
  .debug_weaknames 0 : { *(.debug_weaknames) }
  .debug_funcnames 0 : { *(.debug_funcnames) }
  .debug_typenames 0 : { *(.debug_typenames) }
  .debug_varnames  0 : { *(.debug_varnames) }
}