echi-dbgp: Add kernel debugger support for the usb debug port

[deliverable/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4c44d01c67f43f8cd7bd2108c5aa1297f7122a79..f5fce483930cf933d0eb7928f1a4fa6cfe8ff921 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1127,6 +1127,17 @@ and is between 256 and 4096 characters. It is defined in the file
                        use the HighMem zone if it exists, and the Normal
                        zone if it does not.
 
+       kgdbdbgp=       [KGDB,HW] kgdb over EHCI usb debug port.
+                       Format: <Controller#>[,poll interval]
+                       The controller # is the number of the ehci usb debug
+                       port as it is probed via PCI.  The poll interval is
+                       optional and is the number seconds in between
+                       each poll cycle to the debug port in case you need
+                       the functionality for interrupting the kernel with
+                       gdb or control-c on the dbgp connection.  When
+                       not using this parameter you use sysrq-g to break into
+                       the kernel debugger.
+
        kgdboc=         [KGDB,HW] kgdb over consoles.
                        Requires a tty driver that supports console polling,
                        or a supported polling keyboard driver (non-usb).