u-boot/include/iomux.h
Gary Jennejohn 16a28ef219 IOMUX: Add console multiplexing support.
Modifications to support console multiplexing.  This is controlled using
CONFIG_SYS_CONSOLE_MUX in the board configuration file.

This allows a user to specify multiple console devices in the environment
with a command like this: setenv stdin serial,nc.  As a result, the user can
enter text on both the serial and netconsole interfaces.

All devices - stdin, stdout and stderr - can be set in this manner.

1) common/iomux.c and include/iomux.h contain the environment setting
implementation.
2) doc/README.iomux contains a somewhat more detailed description.
3) The implementation in (1) is called from common/cmd_nvedit.c to
handle setenv and from common/console.c to handle initialization of
input/output devices at boot time.
4) common/console.c also contains the code needed to poll multiple console
devices for input and send output to all devices registered for output.
5) include/common.h includes iomux.h and common/Makefile generates iomux.o
when CONFIG_SYS_CONSOLE_MUX is set.

Signed-off-by: Gary Jennejohn <garyj@denx.de>
2008-12-07 01:23:35 +01:00

49 lines
1.4 KiB
C

/*
* (C) Copyright 2008
* Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
*This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _IO_MUX_H
#define _IO_MUX_H
#include <devices.h>
/*
* Stuff required to support console multiplexing.
*/
/*
* Pointers to devices used for each file type. Defined in console.c
* but storage is allocated in iomux.c.
*/
extern device_t **console_devices[MAX_FILES];
/*
* The count of devices assigned to each FILE. Defined in console.c
* and populated in iomux.c.
*/
extern int cd_count[MAX_FILES];
int iomux_doenv(const int, const char *);
void iomux_printdevs(const int);
device_t *search_device(int, char *);
#endif /* _IO_MUX_H */