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Commit f1a1c2dc authored by Randy Dunlap's avatar Randy Dunlap Committed by Linus Torvalds
Browse files

[PATCH] doc: more serial-console info 



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

Signed-off-by: default avatarRandy Dunlap <rdunlap@xenotime.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 174e27c6

Documentation/kernel-parameters.txt

+10 −5
Original line number Diff line number Diff line
@@ -367,12 +367,17 @@ running once the system is up. 
		tty<n>	Use the virtual console device <n>.



		ttyS<n>[,options]

		ttyUSB0[,options]

			Use the specified serial port.  The options are of

			the form "bbbbpn", where "bbbb" is the baud rate,

			"p" is parity ("n", "o", or "e"), and "n" is bits.

			Default is "9600n8".



			See also Documentation/serial-console.txt.

			the form "bbbbpnf", where "bbbb" is the baud rate,

			"p" is parity ("n", "o", or "e"), "n" is number of

			bits, and "f" is flow control ("r" for RTS or

			omit it).  Default is "9600n8".



			See Documentation/serial-console.txt for more

			information.  See

			Documentation/networking/netconsole.txt for an

			alternative.



		uart,io,<addr>[,options]

		uart,mmio,<addr>[,options]

Documentation/serial-console.txt

+8 −3
Original line number Diff line number Diff line
@@ -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.