[U-Boot] Uboot application problem

[robin]

Hi,

I have a couple of custom application for uboot.
I am able to build and run the application individually 
If i power up the board and run the first application, It executes
without powering off the board if i load second application to same
location, the system hangs.
Both the application has been compiled for same location 0x80000000.
i have tested both application seperately, both are fine.
But when i execute one after another without power off, then system
hangs.
i compiled one application for 0x80000000 and another for 0x81000000
then both application executes without requiring reboot.
i am using the below lds file for applications.

Can some one suggest if it is a stack issue or some other issue.
i had defined usrstack area in my application and verified it using map
file.
but after execution of application i check that area, its not at all
modified,
its 0xFFFFFFFF, i think its using uboot's stack area not the one defined
by my application.
what is causing this behavior and how to resolve it ?

Regards,
Robin


=========================================
OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(main)

MEMORY
{
        ram      : o = 0x80000000, l = 256k
        usrstack : o = 0x83000000, l = 64k
}

SECTIONS
{

  /* Code and Constants */
  .text :
    {
    . = 0x00;

      __text_start = .;
      *.o(.text)
      *.o(.strings)
      *.o(.rodata)
      *.o(.rodata.*)
      *.o(.comment)
      *.o(.debug*)
      *(.rodata.*)
      *(.rodata)
       *(.eh_frame)
       . = ALIGN(32);
      __text_end = .;
    } > ram
  /* Initialized data */
  .init :
    {
     . = ALIGN(32);
      __data_start = .;
       . = ALIGN(32);
      *(.data)
      *(.glue_7)
      *(.glue_7t)
      . = ALIGN(32);
      __data_end = .;
      . = ALIGN(32);
    } > ram

  .bss :
    {
      __bss_start = .;
      *(.bss)
      *(COMMON)
      . = ALIGN(32);
      __bss_end = .;
    } > ram

  /* Application stack */
  .stack :
    {
      __stack_start = .;
      *(.stack)
      __stack_end = .;
      . = ALIGN(32);
    } > usrstack
}
                       

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