1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2a9659dfb74c..233fbaaf2559 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -141,6 +141,25 @@ config SERIAL_ATMEL_TTYAT
 
           Say Y if you have an external 8250/16C550 UART.  If unsure, say N.
 
+config SERIAL_KGDB_NMI
+        bool "Serial console over KGDB NMI debugger port"
+        depends on KGDB_SERIAL_CONSOLE
+        help
+          This special driver allows you to temporary use NMI debugger port
+          as a normal console (assuming that the port is attached to KGDB).
+
+          Unlike KDB's disable_nmi command, with this driver you are always
+          able to go back to the debugger using KGDB escape sequence ($3#33).
+          This is because this console driver processes the input in NMI
+          context, and thus is able to intercept the magic sequence.
+
+          Note that since the console interprets input and uses polling
+          communication methods, for things like PPP you still must fully
+          detach debugger port from the KGDB NMI (i.e. disable_nmi), and
+          use raw console.
+
+          If unsure, say N.
+
 config SERIAL_KS8695
         bool "Micrel KS8695 (Centaur) serial port support"
         depends on ARCH_KS8695