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