J-Link, ARM9, and Micron NAND Flash

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  • J-Link, ARM9, and Micron NAND Flash

    Hello all,

    I am working on a design involving an AT91SAM9G20 and I have a Micron MT29F4G08AACWC:C 4Gb Flash memory attached. However, Jlink gives me the following response when I try to connect:

    - Connecting via USB to J-Link device 0
    - J-Link Firmware: V1.20 (J-Link ARM V7 compiled Jun 30 2009 11:05:27)
    - JTAG speed: 5khz (Fixed)
    - Initializing CPU core(Init sequence) ...
    - - Initialized successfully
    - Using adaptive clocking instead of fixed JTAG speed
    - J-Link found 1 JTAG device. Core ID: 0x0792603F (ARM9)
    - Reading CFI Info ...
    - Could not find any Flash devices
    - ERROR: Failed to connect

    So what is the issue? Do I need to write a file with custom RAM codes?

    I also attached an Atmel AT45 32Mb SPIO flash (my PCB supports both NAND and the SPIO) and I could not identify that device either.

    Any info on how to communicate with these devices would be helpful,

  • Hi Andy,

    yes, in order to program NAND flash or Atmel DataFlash a custom RAMCode is needed by J-Flash.
    Currently custom RAMCodes are supported by J-Flash, but until now there is no customer instruction
    how to write your own RAMCode.

    Currently, custom RAMCodes can be writte by SEGGER upon request. Pricing: Depends on target system (eval board or custom hardware...).
    For more information about pricing, please get in touch with sales@segger.com


    Best regards
    Alex
    Please read the forum rules before posting.

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