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can not read CCSRBAR space on custom P2020 board

Question asked by yansong zhu on Oct 26, 2017
Latest reply on Oct 30, 2017 by Pavel Chubakov

I have a custom P2020 board. I can connect it with USB TAP without any initial tcl file. I also can change and read the core registers. But I can not read the registers of CCSRBAR space, the contents of  these registers display "CCSProtocolPlugin : Error reading memory   cannot start SAP transaction" . Can you tell me what reasons could lead to this error?