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Date: Wed, 06 Feb 2008 00:34:38 +0100
From: Jan Kiszka <jan.kiszka@....de>
To: Jason Wessel <jason.wessel@...driver.com>,
Ingo Molnar <mingo@...e.hu>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
kgdb-bugreport@...ts.sourceforge.net,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 3/3] KGDB: Update documentation
Align KGDB's DocBook chapters with all previous changes. To avoid
confusion, it removes references to the not-yet-merged KGDBOE driver.
Signed-off-by: Jan Kiszka <jan.kiszka@....de>
---
Documentation/DocBook/kgdb.tmpl | 132 ++++++++++++++++------------------------
1 file changed, 55 insertions(+), 77 deletions(-)
Index: b/Documentation/DocBook/kgdb.tmpl
===================================================================
--- a/Documentation/DocBook/kgdb.tmpl
+++ b/Documentation/DocBook/kgdb.tmpl
@@ -77,23 +77,16 @@
and then select "KGDB: kernel debugging with remote gdb".
</para>
<para>
- The first choice for I/O is <symbol>CONFIG_KGDB_ONLY_MODULES</symbol>.
- This means that you will only be able to use KGDB after loading a
- kernel module that defines how you want to be able to talk with
- KGDB. There are two other choices (more on some architectures) that
- can be enabled as modules later, if not picked here.
- </para>
- <para>The first of these is <symbol>CONFIG_KGDB_8250_NOMODULE</symbol>.
- This has sub-options such as <symbol>CONFIG_KGDB_SIMPLE_SERIAL</symbol>
- which toggles choosing the serial port by ttyS number or by specifying
- a port and IRQ number.
- </para>
- <para>
- The second of these choices on most systems for I/O is
- <symbol>CONFIG_KGDBOE</symbol>. This requires that the machine to be
- debugged has an ethernet card which supports the netpoll API, such as
- the cards supported by <symbol>CONFIG_E100</symbol>. There are no
- sub-options for this, but a kernel command line option is required.
+ Next you should choose one of more I/O drivers to interconnect debugging
+ host and debugged target. If debugging early boot steps is required,
+ at least one driver has to be built in. I/O driver configuration takes
+ place via kernel or module parameters, see following chapter.
+ </para>
+ <para>
+ While KGDB is connect with the host, it can dump console messages over
+ this link. This is specifically useful for collecting critical kernel
+ messages while only a single serial port is available. Enable
+ <symbol>CONFIG_KGDB_CONSOLE</symbol> to activate this feature.
</para>
</chapter>
<chapter id="BootingTheKernel">
@@ -103,54 +96,60 @@
wait for gdb connection during booting of a kernel. If the
<symbol>CONFIG_KGDB_8250</symbol> driver is used (or if applicable,
another serial driver) this breakpoint will happen very early on, before
- console output. If you wish to change serial port information and you
- have enabled both <symbol>CONFIG_KGDB_8250</symbol> and
- <symbol>CONFIG_KGDB_SIMPLE_SERIAL</symbol> then you must pass the option
- <constant>kgdb8250=<io or mmio>,<address>,<baud
- rate>,<irq></constant> before <constant>kgdbwait</constant>.
- The values <constant>io</constant> or <constant>mmio</constant> refer to
- if the address being passed next needs to be memory mapped
- (<constant>mmio</constant>) or not. The <constant>address</constant> must
- be passed in hex and is the hardware address and will be remapped if
- passed as <constant>mmio</constant>. The value
- <constant>baud rate</constant> and <constant>irq</constant> are base-10.
- The supported values for <constant>baud rate</constant> are
- <constant>9600</constant>, <constant>19200</constant>,
- <constant>38400</constant>, <constant>57600</constant>, and
- <constant>115200</constant>.
+ console output.
</para>
<para>
- To have KGDB stop the kernel and wait, with the compiled values for the
- serial driver, pass in: <constant>kgdbwait</constant>.
+ The serial port configuration must be passed via the
+ option <constant>kgdb8250=<io|mmio>,<address>[/<regshift>],<baud
+ rate>,<irq></constant>. The values <constant>io</constant> or
+ <constant>mmio</constant> refer to if the address being passed next needs
+ to be memory mapped (<constant>mmio</constant>) or not. The
+ <constant>address</constant> must be passed in hex and is the hardware
+ address and will be remapped if passed as <constant>mmio</constant>. An
+ optional <constant>regshift</constant> value can be given to express
+ address spreading of the 8250 registers. <constant>regshift</constant>
+ just as the succeeding <constant>baud rate</constant> and
+ <constant>irq</constant> values are base-10. The supported values for
+ <constant>baud rate</constant> are <constant>9600</constant>,
+ <constant>19200</constant>, <constant>38400</constant>,
+ <constant>57600</constant>, and <constant>115200</constant>.
</para>
<para>
To specify the values of the serial port at boot:
- <constant>kgdb8250=io,3f8,115200,3</constant>.
+ </para>
+ <para>
+ <constant>kgdb8250=io,3f8,115200,3</constant>
+ </para>
+ <para>
On IA64 this could also be:
+ </para>
+ <para>
<constant>kgdb8250=mmio,0xff5e0000,115200,74</constant>
- And to have KGDB also stop the kernel and wait for GDB to connect, pass in
- <constant>kgdbwait</constant> after this arguement.
</para>
<para>
- To configure the <symbol>CONFIG_KGDBOE</symbol> driver, pass in
- <constant>kgdboe=[src-port]@<src-ip>/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]</constant>
- where:
- <itemizedlist>
- <listitem><para>src-port (optional): source for UDP packets (defaults to <constant>6443</constant>)</para></listitem>
- <listitem><para>src-ip: source IP to use (interface address)</para></listitem>
- <listitem><para>dev (optional): network interface (<constant>eth0</constant>)</para></listitem>
- <listitem><para>tgt-port (optional): port GDB will use (defaults to <constant>6442</constant>)</para></listitem>
- <listitem><para>tgt-ip: IP address GDB will be connecting from</para></listitem>
- <listitem><para>tgt-macaddr (optional): ethernet MAC address for logging agent (default is broadcast)</para></listitem>
- </itemizedlist>
- </para>
- <para>
- The <symbol>CONFIG_KGDBOE</symbol> driver can be reconfigured at run time,
- if <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol>
- are enabled, by echo'ing a new config string to
- <constant>/sys/module/kgdboe/parameter/kgdboe</constant>. The
- driver can be unconfigured with the special string
- <constant>not_configured</constant>.
+ If the debugger is not needed early, the alternative configuration format
+ <constant>kgdb8250=ttyS<n>,<baud rate></constant> can be used.
+ The required parameters are then obtained from the standard 8250 driver.
+ Example:
+ </para>
+ <para>
+ <constant>kgdb8250=ttyS0,115200</constant>
+ </para>
+ <para>
+ To configure the <symbol>CONFIG_KGDBOC</symbol> driver, just pass in
+ <constant>kgdboc=<tty-device></constant>. It will try to connect
+ to gdb over the given serial console. Note that KGDBOC does not support
+ interrupting the target via the gdb remote protocol. Instead you will
+ need to issue sysrq-g via the console or locally on the target.
+ </para>
+ <para>
+ All drivers can be reconfigured at run time, if
+ <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol> are
+ enabled, by echo'ing a new config string to
+ <constant>/sys/module/<driver>/parameter/<option></constant>.
+ The driver can be unconfigured by passing an empty string. You cannot
+ change the configuration while the debugger is attached. In that case
+ issue the required <constant>detach</constant> command via gdb first.
</para>
</chapter>
<chapter id="ConnectingGDB">
@@ -212,25 +211,4 @@
</para>
!Iinclude/linux/kgdb.h
</chapter>
- <chapter id="CommonBackEndOpt">
- <title>The common backend (optional)</title>
- <para>
- These functions are part of the common backend, found in kernel/kgdb.c
- and are optionally implemented. Some functions (with _hw_ in the name)
- end up being required on arches which use hardware breakpoints.
- </para>
-<!--
-X!Ikernel/kgdb.c
--->
- </chapter>
- <chapter id="DriverSpecificFunctions">
- <title>Driver-Specific Functions</title>
- <para>
- Some of the I/O drivers have additional functions that can be
- called, that are specific to the driver. Calls from other places
- to these functions must be wrapped in #ifdefs for the driver in
- question.
- </para>
-!Idrivers/serial/8250_kgdb.c
- </chapter>
</book>
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