1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Kernel config options for kdb</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Using kgdb, kdb and the kernel debugger internals"><link rel="up" href="CompilingAKernel.html" title="Chapter&#160;2.&#160;Compiling a kernel"><link rel="prev" href="CompilingAKernel.html" title="Chapter&#160;2.&#160;Compiling a kernel"><link rel="next" href="kgdbKernelArgs.html" title="Chapter&#160;3.&#160;Kernel Debugger Boot Arguments"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Kernel config options for kdb</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="CompilingAKernel.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;2.&#160;Compiling a kernel</th><td width="20%" align="right">&#160;<a accesskey="n" href="kgdbKernelArgs.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="CompileKDB"></a>Kernel config options for kdb</h2></div></div></div><p>Kdb is quite a bit more complex than the simple gdbstub
2    sitting on top of the kernel's debug core.  Kdb must implement a
3    shell, and also adds some helper functions in other parts of the
4    kernel, responsible for printing out interesting data such as what
5    you would see if you ran "lsmod", or "ps".  In order to build kdb
6    into the kernel you follow the same steps as you would for kgdb.
7    </p><p>The main config option for kdb
8    is <span class="symbol">CONFIG_KGDB_KDB</span> which is called "KGDB_KDB:
9    include kdb frontend for kgdb" in the config menu.  In theory you
10    would have already also selected an I/O driver such as the
11    CONFIG_KGDB_SERIAL_CONSOLE interface if you plan on using kdb on a
12    serial port, when you were configuring kgdb.
13    </p><p>If you want to use a PS/2-style keyboard with kdb, you would
14    select CONFIG_KDB_KEYBOARD which is called "KGDB_KDB: keyboard as
15    input device" in the config menu.  The CONFIG_KDB_KEYBOARD option
16    is not used for anything in the gdb interface to kgdb.  The
17    CONFIG_KDB_KEYBOARD option only works with kdb.
18    </p><p>Here is an example set of .config symbols to enable/disable kdb:
19    </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p># CONFIG_DEBUG_RODATA is not set</p></li><li class="listitem"><p>CONFIG_FRAME_POINTER=y</p></li><li class="listitem"><p>CONFIG_KGDB=y</p></li><li class="listitem"><p>CONFIG_KGDB_SERIAL_CONSOLE=y</p></li><li class="listitem"><p>CONFIG_KGDB_KDB=y</p></li><li class="listitem"><p>CONFIG_KDB_KEYBOARD=y</p></li></ul></div><p>
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