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Add some information about breaking to the debugger from the command

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line with :

  # sysctl -w debug.enter_debugger=ddb

PR:		docs/32483
Submitted by:	archie
This commit is contained in:
Murray Stokely 2001-12-08 04:31:22 +00:00
parent f54121bd7f
commit dd4e35d55c
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=11359
1 changed files with 14 additions and 3 deletions
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17
en_US.ISO8859-1/books/developers-handbook/kerneldebug/chapter.sgml
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@ -330,9 +330,20 @@
in debug mode and enter DDB prior to any device probing. Hence you can
even debug the device probe/attach functions.</para>
<para>The second scenario is a hot-key on the keyboard, usually
Ctrl-Alt-ESC. For syscons, this can be remapped; some of the
distributed maps do this, so watch out. There is an option available
<para>The second scenario is to drop to the debugger once the
system has booted. There are two simple ways to accomplish
this. If you would like to break to the debugger from the
command prompt, simply type the command :</para>
<screen>&prompt.root; sysctl -w debug.enter_debugger=ddb</screen>
<para>Alternatively, if you are at the system console, you may use
a hot-key on the keyboard. The default break-to-debugger
sequence is <keycombo action="simul"><keycap>Ctrl</keycap>
<keycap>Alt</keycap><keycap>ESC</keycap></keycombo>. For
syscons, this sequence can be remapped and some of the
distributed maps out there do this, so check to make sure you
know the right sequence to use. There is an option available
for serial consoles that allows the use of a serial line BREAK on the
console line to enter DDB (<literal>options BREAK_TO_DEBUGGER</literal>
in the kernel config file). It is not the default since there are a lot