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ccs connection error - evm814x

Hello everyone,

When I tried to connect the CortexA8 on my 814xEVM,

connection failed with following error messages.

CCS v5.2.1.00018, emulator XDS100v2

error mesage:

IcePick_D_0: Error connecting to the target: (Error -2131 @ 0x0) Unable to access device register. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK). (Emulation package 5.0.747.0)

Can anybody help me?

Regards,

Eunhye