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-rw-r--r--share/man/man4/ddb.415
1 files changed, 10 insertions, 5 deletions
diff --git a/share/man/man4/ddb.4 b/share/man/man4/ddb.4
index 83bf001..04df724 100644
--- a/share/man/man4/ddb.4
+++ b/share/man/man4/ddb.4
@@ -60,7 +60,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd January 14, 2016
+.Dd January 15, 2016
.Dt DDB 4
.Os
.Sh NAME
@@ -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 run-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.
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