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"Write to ARM debug port timed out" error message

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I'm getting "Write to ARM debug port timed out" error message when downloading a program, what does this mean?

 

You get the "Write to ARM debug port timed out" or "Read from ARM debug port timed out" error message when the host loader program cannot communicate with the target loader program.

The usual cause of this is that the JTAG interface is running too quickly for the target. Try enabling adaptive clocking (if supported by the target) or reducing the JTAG clock frequency.

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    Dalgeo

    Tried enabling adaptive clocking, tried setting clocking to auto and tried clock divider from 1 to 8 and still the same error. 

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    Luc Vermeersch

    This doesn't help, same error. Downloading and verification of loader is ok.

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