ARM DS-5 Using the Debug Hardware Configuration Utilities

Configuring debug hardware for GDB9.5 DCC modesIf your target application communicates using DCC, you must configure the DCC mode. Youcan set the following DCC modes:Mode 0: raw DCCRaw, unprocessed, data is fed to the client through the DCC register on the target.Mode 1: redirected raw DCCIn this mode, the data is fed over TCP/IP ports starting at 5000. Data is sent fromthe host to the target 4 bytes at a time. If fewer than 4 bytes are available, the datais padded with 0 bytes until it is 4 bytes long. Data from the target to the host isreceived 4 bytes at a time, and no padding or trimming is performed.NoteIt is recommended that you use the Virtual Ethernet/TTY mode (mode 2).However, if the Virtual Ethernet/TTY mode is unsuitable for your application,then you can use mode 1 DCC but you must also implement a suitablecommunications protocol.Mode 2: Virtual Ethernet/TTY modeVirtual Ethernet/TTY is used for providing virtual serial and Ethernetconnections to the target. As far as the debug host and the target are concerned,Virtual Ethernet/TTY mode is a debug hardware feature that provides:• A virtual Ethernet feature using the DCC channel and a collection ofsoftware tools in debug hardware and the host PC. It enables TCP/IP to beused to the target as though the target has an Ethernet port of its own.• A virtual serial port feature using the DCC channel and a collection ofsoftware tools in debug hardware and the host PC.9.5.1 See alsoTasks• Connecting to targets from GDB through debug hardware on page 9-22.Concepts• Setting DCC parameters on page 9-23• DCC and interrupts on page 9-25.Reference• Debug hardware TCP/IP port numbering on page 9-6• rvigdbconfig command syntax on page 9-27• rviload command syntax on page 9-28.ARM DUI 0498F Copyright © 2010-2012 ARM. All rights reserved. 9-7ID021112Non-Confidential