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Add some clarifications.

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This commit is contained in:
Warner Losh 2016-01-16 01:13:27 +00:00
parent 195a8c0316
commit 21e079b85b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=294121
1 changed files with 9 additions and 4 deletions
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13
share/man/man4/ddb.4
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@ -1437,15 +1437,18 @@ Other bus' bridge chipsets may be able to generate NMI using bus specific
methods.
There are many PCI and PCIe add-in cards which can generate NMI for
debugging.
Modern systems typically use IPMI to generate signals to enter the
Modern server systems typically use IPMI to generate signals to enter the
debugger.
The
.Dv devel/ipmitool
port can be used to send the
.Cd chassis power diag
command which delivers an NMI to the processor.
Embedded systems often use JTAG for debugging, but rarely use it in
combination with
.Nm .
.Pp
For serial consoles, you can break to the debugger by sending a BREAK
For serial consoles, you can enter the debugger by sending a BREAK
condition on the serial line if
.Cd options BREAK_TO_DEBUGGER
is specified in the kernel.
@ -1464,11 +1467,13 @@ TILDE is the ASCII tilde character (~).
CTRL-x is Control x created by hitting the control key and then x
and then releasing both.
.Pp
The break to debugger behavior may also be enabled by setting the
The break to enter the debugger behavior may be enabled at trim-time
by setting the
.Xr sysctl 8
.Dv debug.kdb.break_to_debugger
to 1.
The alt break to debugger behavior may also be enabled by setting the
The alternate sequence to enter the debugger behavior may be enabled
at run-time by setting the
.Xr sysctl 8
.Dv debug.kdb.alt_break_to_debugger
to 1.