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[PATCH] doc: more serial-console info

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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>
This commit is contained in:
Randy Dunlap 2006-03-25 03:08:17 -08:00 committed by Linus Torvalds
parent 174e27c607
commit f1a1c2dc2a
2 changed files with 17 additions and 7 deletions
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13
Documentation/kernel-parameters.txt
View file

@ -367,12 +367,17 @@ running once the system is up.
tty<n> Use the virtual console device <n>. tty<n> Use the virtual console device <n>.
ttyS<n>[,options] ttyS<n>[,options]
ttyUSB0[,options]
Use the specified serial port. The options are of Use the specified serial port. The options are of
the form "bbbbpn", where "bbbb" is the baud rate, the form "bbbbpnf", where "bbbb" is the baud rate,
"p" is parity ("n", "o", or "e"), and "n" is bits. "p" is parity ("n", "o", or "e"), "n" is number of
Default is "9600n8". bits, and "f" is flow control ("r" for RTS or
omit it). Default is "9600n8".
See also Documentation/serial-console.txt. See Documentation/serial-console.txt for more
information. See
Documentation/networking/netconsole.txt for an
alternative.
uart,io,<addr>[,options] uart,io,<addr>[,options]
uart,mmio,<addr>[,options] uart,mmio,<addr>[,options]

11
Documentation/serial-console.txt
View file

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