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  1. Followed the Zybo Getting Started scenario with Vivado and then SDK, Program FPGA results in "Done" light going on. However,the Run As→Launch on Hardware(GDB) results in error message " Unexpected error while launching program: Error while running ps7_init method. Cannot write to target Cannot access JTAG-DP: invalid ACK value (0x00, expected=0x02) Error Address = 0xf800074c " Jumpered for USB power, with both the USB and the micro-USB plugs connected to laptop, which together cause PGOOD to be lit on. JP5 jumpered for JTAG. What is causing this .elf "Cannot write" error, when the prior Program FPGA does result in Done success ? More experiences: ============================================================================= XSDB ----------------------------------------- Program FPGA (success, with Done light on) ----------------------------------------- 100% 1MB 1.9MB/s 00:01 ----------------------------------------- mrd 0xF800025C xsdb% Context does not support memory read. Unsupported command ----------------------------------------- System Debugger on Local app.elf ----------------------------------------- Info: ARM Cortex-A9 MPCore #0 (target 2) Stopped at 0xffffff28 (Suspended) Info: ARM Cortex-A9 MPCore #1 (target 3) Stopped at 0xffffff34 (Suspended) ----------------------------------------- Error while launching program: Invalid DAP ACK value: 0 ----------------------------------------- mrd 0xF800025C F800025C: 00000000 ----------------------------------------- ================================================================================ Is this normal for this PCB or do I have a bad board ?