Atmel AT91SAM9261 - Could not find supported CPU core on JTAG chain

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  • Atmel AT91SAM9261 - Could not find supported CPU core on JTAG chain

    Dear all,

    I want to use the SEGGER SAM-ICE JTAG Emulator together with an Atmel AT91SAM9261 based board.
    The JLink Drivers are correctly installed and the emulator is recognised correctly by Windows XP.
    However when I start the JLink Commander I get the following messages:

    Source Code

    1. C:\Programme\SEGGER\JLinkARM_V390a>JLink.exe
    2. SEGGER J-Link Commander V3.90a ('?' for help)
    3. Compiled Aug 19 2008 18:58:22
    4. DLL version V3.90a, compiled Aug 19 2008 18:58:08
    5. Firmware: J-Link ARM V8 compiled Mar 27 2009 16:41:15
    6. Hardware: V8.00
    7. S/N : 28003721
    8. OEM : SAM-ICE
    9. Feature(s) : RDI
    10. VTarget = 3.261V
    11. Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
    12. Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
    13. ****** Error: Could not find supported CPU core on JTAG chain
    14. JTAG speed: 5 kHz
    15. J-Link>
    Display All


    VTarget is correctly displayed but JLink doesn't seem to find a supported CPU.
    A subsequent reset of the cpu shows the following:

    Source Code

    1. J-Link>rx 0
    2. Reset delay: 0 ms
    3. Reset type NORMAL: Using RESET pin, halting CPU after Reset
    4. Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
    5. Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
    6. Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
    7. Info: TotalIRLen = ?, IRPrint = 0x..FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
    8. Info: Resetting target using RESET pin
    9. Info: Halting CPU core
    10. WARNING: Received 0 as core Id.
    11. ****** Error: Could not find supported CPU core on JTAG chain
    12. Bad JTAG communication: Write to IR: Expected 0x1, got 0x7 (TAP Command : 2) @ O
    13. ff 0x5.
    Display All


    The JTAGSEL signal of the processor is in low state which means the processor is running in ICE mode. I think this should be OK right?

    Any comments or ideas on this would be highly appreciated.

    Thanks and with best regards,
    Markus Franke
  • [SOLVED] Atmel AT91SAM9261 - Could not find supported CPU core on JTAG chain

    Dear all,

    I solved the problem by myself. I finally found out that there was a jumper missing on the TDO line of the processor.
    Maybe this is some help for somebody who observes similiar problems in the future.

    Best regards,
    Markus Franke