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<concept id="GUID-BC0936D7-7064-447D-83EF-68C65CF3D1B0" xml:lang="en"><title> On-Target

Debugging</title><shortdesc>This document describes how to build a device driver to enable

stop mode debugging.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-664F0388-0A89-476F-B784-57E956C07779">       <title> On-target

debugging</title>       <p>Device Driver debugging is similar to kernel-mode

debugging, as drivers run as part of the Kernel. Debug versions of the drivers

can be debugged using debug tools such as Lauterbach through a JTAG interface

or an IDE. Other debug tools such as Metro TRK can also be used. </p> <p>Most

of the hardware platforms supported by Symbian platform are ICE-enabled. Kernel

developers and those porting the operating system to new hardware often have

access to development boards exposing the JTAG interface, which allows the

use of CPU-level debuggers. Using a host PC debugger, such as Carbide.c++

or CodeWarrior configured for remote debugging, a debug ROM image (including

drivers) can be downloaded to the target and debugged over a JTAG interface. </p> <p>For

debugging, debug versions drivers are built, and the ROM image is built to

include the kernel debug DLL, which enables kernel-side (stop mode) debugging.

This is done by using the <codeph>STOP_MODE_DEBUGGING</codeph> flag while

building the ROM image. For example: </p> <p><userinput>rom –v=h4hrp –I=armv5

–define=STOP_MODE_DEBUGGING</userinput> </p> <p>This includes the kernel extension <filepath>kdebug.dll</filepath> in

the ROM image, which provides a stop mode debugger API. </p> <p>When the ROM

image is downloaded to the target, the system boots up and the Kernel or driver

can be debugged using the host based IDE interface. Code can be stepped through

and halted, and memory on the target can be viewed. </p> <p>Symbian also provide

a debug monitor (sometimes called the crash debugger) to provide information

on Kernel crashes. See <xref href="GUID-26714A57-B6B4-5E81-B512-FB520718482B.dita">Debug

Monitor Tool</xref> for more details. </p>     </section>

</conbody></concept>