[PATCH] doc: more serial-console info

Add info on flow control for serial consoles.  Refer to netconsole option
also.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/Documentation/serial-console.txt b/Documentation/serial-console.txt
index 6c689b0df2b8..9a7bc8b3f479 100644
--- a/Documentation/serial-console.txt
+++ b/Documentation/serial-console.txt
@@ -17,11 +17,13 @@ The format of this option is:
                         ttyX for any other virtual console
                         ttySx for a serial port
                         lp0 for the first parallel port
+                        ttyUSB0 for the first USB serial device
 
         options:        depend on the driver. For the serial port this
-                        defines the baudrate/parity/bits of the port,
-                        in the format BBBBPN, where BBBB is the speed,
-                        P is parity (n/o/e), and N is bits. Default is
+                        defines the baudrate/parity/bits/flow control of
+                        the port, in the format BBBBPNF, where BBBB is the
+                        speed, P is parity (n/o/e), N is number of bits,
+                        and F is flow control ('r' for RTS). Default is
                         9600n8. The maximum baudrate is 115200.
 
 You can specify multiple console= options on the kernel command line.
@@ -45,6 +47,9 @@ become the console.
 You will need to create a new device to use /dev/console. The official
 /dev/console is now character device 5,1.
 
+(You can also use a network device as a console.  See
+Documentation/networking/netconsole.txt for information on that.)
+
 Here's an example that will use /dev/ttyS1 (COM2) as the console.
 Replace the sample values as needed.