Messages in this thread Patch in this message | | | Date | Mon, 20 Mar 2006 23:02:37 -0800 | From | "Randy.Dunlap" <> | Subject | [PATCH] doc: more serial-console info. |
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From: Randy Dunlap <rdunlap@xenotime.net>
Add info on flow control for serial consoles. Refer to netconsole option also.
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> --- Documentation/kernel-parameters.txt | 15 ++++++++++----- Documentation/serial-console.txt | 11 ++++++++--- 2 files changed, 18 insertions(+), 8 deletions(-)
--- linux-2616-work.orig/Documentation/kernel-parameters.txt +++ linux-2616-work/Documentation/kernel-parameters.txt @@ -366,12 +366,17 @@ 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] --- linux-2616-work.orig/Documentation/serial-console.txt +++ linux-2616-work/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.
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