AR# 56781

描述

On my customer's board, Zynq is second device on JTAG chain. On this board, JTAG cannot be connected from SDK GUI. When launching debugger by [Debug as] > [Launch on Hardware], connection fails with the following message:

> The device at 1 position cannot be debugged. It is either not a FPGA or PowerPC/ARM device.

It looks SDK cannot connect to Zynq when it is not the first JTAG device.

As a trial, the customer tried configuring JTAG ([Xilinx Tools] > [Configure JTAG settings]), but it did not solve the issue.

解决方案

To debug with GDB/XMD, follow the steps below.

1. Download Bitstream into PL. (In this example, PL TAP is the third device on JTAG chain.)

   XMD% fpga -f xxxxx.bit -debugdevice deviceNr 3

2. Connect XMD with ARM DAP.

   XMD% connect arm hw debugdevice deviceNr 2

   Once the connection is established, you will see the following message:

   Connected to "arm" target. id = 64
   Starting GDB server for "arm" target (id = 64) at TCP port no 1234

3. Run ps7_init.tcl in advance.

   XMD% source <path to TCL>/ps7_init.tcl

4. Setup Remote Debug and start debugging.
   In the debug configration window, select the tab [Remote Debug] and check "Connect to gdbserver on a different machine."
   Input the port number which you obtained in the Step 2.