1. This forum section is a read-only archive which contains old newsgroup posts. If you wish to post a query, please do so in one of our main forum sections (here). This way you will get a faster, better response from the members on Motherboard Point.

AT91RM9200 problems to run from SDRam

Discussion in 'Embedded' started by Reiner, Oct 30, 2006.

  1. Reiner

    Reiner Guest


    We build own at91 board with an AT45DB642 and 64MB of SDRam.
    Above I'll describe some details.

    At45DB642 is attached to at91rm9200 on CS0 and SDRam is using a 32bits
    of data path.
    We already tested both, and they are working without any kind of
    problem. We wrote data on At45DB642 and read it without errors, the
    same occured with SDRAM.

    What occurs is that when we run a program from internal ram, everything
    goes fine.
    But when we try to run some program from SDRam we get an 0xff on debug
    serial port. And the program doesn't run.
    We tested, our software, loader.bin and romboot.bin.

    Does anybody see something like it?

    Reiner, Oct 30, 2006
    1. Advertisements

  2. Reiner

    Stef Guest

    In comp.arch.embedded,
    Are you sure your code is OK and does the link address correspond with
    the address range of the SDRAM?

    How sure are you that your SDRAM works OK and how did you test it? If you
    for instance tried write and read in fast succession and that went OK, you
    may still have a problem with your refresh.
    Stef, Oct 31, 2006
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.