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Altera_Forum's avatar
Altera_Forum
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19 years ago

Link all my code beginning from address 0

Hello,

may be, this is a simple question, but I can't find the answer as quickly as I wish. ;-) I just want to link all my code and the code of some (used) HAL functions starting from address 0. This question arises from the fact, that I have build custom memory controller that maps accesses on the avalon bus in the lower 1MB range to some external SRAM. There I want to place all my code. To download the code, I planned to use the GERMS Monitor for the NIOS II (found here in the forum).

So all I now have to know is, how can I instruct the Linker to continously link the code starting from address 0?

In the NIOS 2 IDE, it is only possible to specify some installed memories, where the linker section .text, .rodata, etc. shall be placed. In those pull-down-menus my memory controller doesn't appear. Can I change this?

Thanks for any replies.

Regards.

1 Reply

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

    Hi GrubenKarlo,

    > So all I now have to know is, how can I instruct the Linker to continously link the code starting

    > from address 0?

    There are several techniques you can use. The quickest (for experimenting) is to use objcopy

    to change the section addresses. E.g.:

    nios2-elf-objcopy --change-section-address .text=0 foo.elf

    You might need to move your other sections as well (.data, .bss, .sbss).

    In the long run, you will probably want to just pass the -Ttext option to ld.

    Regards,

    --Scott