Problem with the linker file

[ssharish2005]

Hi,

I started learning to program embedded system for my project. I use a board called viper-lite which works on PXA255 RISC based processor which contains 64Mb of RAM and 16MB of flash memory

I wrote a code which actually blink a LED with following some instruct from the book. And i wrote a liker script for that blinking problem which was giving in the book. But when i try to link the object file with the linker everything goes fine.

But when i try to load the exe to the target board it gives me an error.

C*** Abort! Attempt to load ELF data to address: 0x00000000 which is not in RAM
xyzModem - CRC mode, 8(SOH)/2(STX)/0(CAN) packets, 5 retrie

which looks like that its a linker problem. And here is the linker file which i wrote

ENTRY (main)

MEMORY
{
    ram : ORIGIN = 0x00400000, LENGTH = 64M
    rom : ORIGIN = 0x60000000, LENGTH = 16M
}

SECTIONS
{
    data :
    {
        _DataStart = . ;
        *(.data)
        _DataEnd   = . ;
    } >ram

    bss :
    {
        _BssStart = . ;
        *(.bss)
        _BssEnd   = . ;
    } >ram

    text :
    {
        *(.txt)
    } >ram
}

Can anyone know whats the problem, may be some one who have already work on viper lite.

thank you

ssharish2005

[Salem]

Why is the .text in ram rather than rom?

Check the map file to see what other sections there are in the image. Anything which isn't matching text, data or bss is going to start at 0.

[ssharish2005]

Thanks Salem for the reply.

I use Redboot to download the image file from the system to the target board uisng load command. Would that actual loads the command on the RAM rather than ROM. Is that the reason why the it is been specified as RAM.

And i even checked the authors linker files as well. Even he has specified as ram

ENTRY (main)

MEMORY
{
    ram : ORIGIN = 0x00400000, LENGTH = 64M
    rom : ORIGIN = 0x60000000, LENGTH = 16M    /* Change to LENGTH = 32M for larger flash. */
}

SECTIONS
{
    data :                              /* Initialized data. */ 
    { 
        _DataStart = . ; 
        *(.data) 
        _DataEnd   = . ;

    } >ram
     
    bss :                               /* Uninitialized data. */
    { 
        _BssStart = . ;
        *(.bss) 
        _BssEnd   = . ;
    } >ram
     
    text :                              /* The actual instructions. */
    { 
        *(.text) 
    } >ram
}

It makes sense why it should be rom. Salem i am not pretty sure of what u are trying to says here.

Check the map file to see what other sections there are in the image. Anything which isn't matching text, data or bss is going to start at 0.

This is is my map file

Memory Configuration

Name             Origin             Length             Attributes
ram              0x00400000         0x04000000
rom              0x60000000         0x01000000
*default*        0x00000000         0xffffffff

Linker script and memory map


data            0x00400000        0x0
                0x00400000                _DataStart = .
 *(.data)
                0x00400000                _DataEnd = .

bss             0x00400000        0x0
                0x00400000                _BssStart = .
 *(.bss)
                0x00400000                _BssEnd = .

text            0x00400000      0x148
 *(.text)
 .text          0x00400000       0xac led.o
                0x00400060                ledToggle
                0x00400000                ledInit
 .text          0x004000ac       0x9c blink.o
                0x0040010c                main
                0x004000ac                delay_ms
LOAD led.o
LOAD blink.o
OUTPUT(blink.exe elf32-littlearm)
....

Thanks Salem

ssharish2005