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How do I configure RVD v3.1/RVI v3.2.1 to capture ETM trace using the Embedded Trace Buffer (ETB) on the PB1176?

Applies to: PB1176, RealView Development Suite (RVDS), RealView ICE and Trace (RVI / RVT)


The ARM1176JZF-S Development Chip integrated on the PB1176 can be configured as a traditional or a CoreSight JTAG system based design. To capture ETM trace on the PB1176, the system must be configured as a CoreSight system by placing a jumper on J1.

This Knowledge Article explains how to configure RVD v3.1/RVI 3.2.1 RealView Debugger v3.1 (RVD v3.1) and RealView ICE v3.2.1 (RVI v3.2.1) for trace on the PB1176 using the on-chip Embedded Trace Buffer (ETB).

In this case, an RealView Trace (RVT) unit is not required as the trace data is sent directly to the ETB using RVI.

The following software must be installed in order to perform trace on the PB1176:

To obtain the Installer Patch and the Patch for RVDS v3.1, visit the ARM Technical Support web pages:

It is important to do this installation in the following order:

  1. RVDS v3.1
  2. RVDS v3.1 Installer Patch
  3. RVDS v3.1 Patch
  4. RVI v3.2.1

The following steps are needed to configure the RVD 3.1/RVI 3.2.1 interface to the PB1176 development board:

RVI Configuration:

  1. Connect the RVI unit to the "JTAG ICE" port (J12 on the PB1176) .
  2. Power up the PB1176 and the RVI unit.
  3. Start RVD. Select Target → Connect to Target from the Menu. This opens the RVD connection control window.
  4. In the RVD connection control window, click on the "Add" button next to "RealView ICE". This opens the "RVConfig" window.
  5. In "RVConfig" select your RVI unit from the list displayed and click the "Connect" button.
  6. Click "Autoconfigure Scan Chain" to autodetect the Coresight system. It will result in the ARMCS-DP device being found. This device represents the Debug Access Port (DAP) in a CoreSight system.
  7. To find the debuggable devices connected to the DAP, right click on the ARMCS-DP device and select "Read CoreSight ROM table".
  8. The previous step will result in the scan chain shown in Figure 1 being found but with the Coresight components in a slightly di. Right click on the ARM1176JZF-JTAG-AP device, select "Properties" and select "Embedded Trace Buffer(ETB)".

    1. Figure 1
  9. Reorder the displayed items by using the "Move Left" and "Move Right" buttons so that they match Figure 1. This is necessary as the order of the components must match the Associations File discussed in the next step.
  10.  Add an Associations File to describe the connections between the devices. The Associations File is available from here:

    TEXT Icon PB1176TraceETB_associations.txt
    1. Save this file in a local directory.
    2. To add the Associations File, in the "RVConfig" window click "Set Associations" button and select your Associations File.
  11. In the "RVConfig" window select the File tab, Save and Exit

RVD Configuration:

The RVD configuration steps can be gathered in a script to be loaded in RVD. This script contains the RVD commands that perform the connection to the Coresight components and the configuration for the ETM registers.

An example of an RVD configuration script file which configures the PB1176 for 16-bit trace is available here:

Alternatively, you can manually configure RVD using the following steps:

  1. The RVD connection control window should now show all of the devices you have configured, except for the ARMCS-DP.
  2. Double click on ARM1176JZF-JTAG-AP to connect. Do the same for the ETM and ETB.

    Next we will set up the registers for the ETM:

  3. Open a Registers window by selecting View → Registers from the Menu. To see the registers for each of the components, use the "Cycle Connections" button from the Menu.
  4. Select the ETM and in the Registers window set the "ETM CS TRACE ID" register to a small non-zero value, for instance 0x55.

  5. In the RVD window, click the "Cycle Connections" button to select the ARM1176 core. Click View → Analysis Window to open the Analysis window. Click the Edit tab and select the "Connect/Disconnect Analyzer" option.
  6. Load an image and run it. You should get trace output in the Analysis window. Note that to be able to see the trace output on the Analysis window you should stop the target or disable trace.

Note: For any information regarding the CoreSight components configuration please refer to the CoreSight Components Technical Reference Manual available at the ARM Website:

Attachments: scanchain_3.2,1.JPG , PB1176TraceETB_associations.txt ,

Article last edited on: 2009-04-14 13:51:42

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