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i.MX25 PDK with Keil U-linlk problem

Hi,

We connect JTAG to the i.MX25 PDK, the switch power on. In "Options for target"->"Debug"->"Settings (ULINK ARM Debuger)", "JTAG Device Chain" group box shows a message "JTAG Communication failure". Whats the problem?

How to manually configure the JTAG device chain for i.MX25PDK?

Is there any sample programs available in KEIL for i.MX25PDK?