The Cortex-A8 processor integrated on the PB-A8 development platform supports CoreSight Technology for trace. This FAQ explains how to configure RealView Debugger (RVD) and RealView ICE (RVI) for external trace on the PB-A8 using the Trace Port Interface Unit (TPIU). A PB-A8 configured with Versatile Family CD v3.5 requires RealView Trace 2 (RVT2) for trace capture.

The following software must be installed in order to perform trace on the PB-A8:

• RealView Development Suite (RVDS) v3.1 patched to RVD build 1034 or later.
• RVI v3.2.1 Firmware v3.2.1 patched to build 860 or later.

To obtain these patches, please visit the ARM technical support web pages:

The following steps are needed to configure the RVD/RVI interface to the PB-A8 development board:

RVI Configuration:

1. Connect the RVI unit to the JTAG port located on the rear panel of the PB-A8 and the RVT probe to J54 on the PB-A8 (for up to 16-bit trace).
   
   1. 
      
2. Power up the PB-A8 and the RVI unit.
   
   1. 
      
3. Start RVD. Select Target → Connect to Target from the Menu. This opens the RVD connection control window.
   
   1. 
      
4. In the RVD connection control window, click on the "Add" button next to "RealView ICE". This opens the "RVConfig" window.
   
   1. 
      
5. In "RVConfig" select your RVI unit from the list displayed and click the "Connect" button.
   
   1. 
      
6. Click "Auto Configure Scan Chain" to autodetect the CoreSight system.
   
   1. 
      
7. If the previous step has been successful, it will result in the ARMCS-DP device being found. This device represents the Debug Access Port (DAP) in a CoreSight system.
   
   1. 
      
8. To find the debuggable devices connected to the DAP, right click on the ARMCS-DP device and select "Read CoreSight ROM table".
   
   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.
   
   
   
   
   Figure 1.
   
   
   
10. Add an Associations File to describe the connections between the devices. The Associations File is available from here:
    
    

    PB-A8_associations.txt

    1. 
       
    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. The Associations File for the scan chain specified in the previous step contains the following text:

    Name=ARMCS-DP;Type=ARMCS-DP;
    Name=Cortex-A8;Type=Cortex-A8;ETM=ETM;
    Name=ETM;Type=CSETM;TraceOutput1=TPIU;Core=Cortex-A8;
    Name=Funnel;Type=CSTFUNNEL
    Name=TPIU;Type=CSTPIU;TraceInput=ETM;
    Name=CSCTI1;Type=CSCTI
    Name=CSCTI2;Type=CSCTI

    For further information on writing and understanding Association Files you can visit ARM Technical Support web pages:

    http://www.arm.com/support/faqdev/18377.html

    1. 
       
11. In the "RVConfig" window select the File tab, Save and Exit.

1. The RVD connection control window should now show all of the devices you have configured, except for the ARMCS-DP.
   
   1. 
      
2. Double click on Cortex-A8 to connect. Do the same for the ETM, Funnel, and TPIU.
   

   Next we will set up the registers for the ETM, TPIU, and Funnel:

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.
   .
   1. 
      
4. Select the ETM and in the Registers window set the "CS TRACE ID" register to a small non-zero value, for instance 0x55.
   
   1. 
      
5. Select the TPIU. In the Registers window set the CSTPIU CURPORTSIZE register to the required Port Width - 0x8000 for 16-bit trace, 0x80 for 8-bit trace or 0x8 for 4-bit trace. Set the CSTPIU FFCR to 0x1003 (Continuous Mode) or to 0x1000 (Bypass Mode).
   
   1. 
      
6. Select the Funnel. In the Registers window set the CSTF CTRL register to 0x301 to allow the ETM to output trace data through the TPIU.
   
   1. 
      
7. In the RVD window, click the "Cycle Connections" button to select the Cortex-A8 core. Click View → Analysis Window to open the Analysis window. Click the Edit tab and select the "Connect/Disconnect Analyzer" option.
   
   1. 
      
8. 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.

• How do I produce a trace Association file to describe my CoreSight systems to RVD/RVIv3.1?